Pub Date : 2024-12-02DOI: 10.1016/j.soilbio.2024.109652
Shiting Li, Maokui Lyu, Cui Deng, Wei Deng, Xiaohong Wang, Anne Cao, Yongmeng Jiang, Jueling Liu, Yuming Lu, Jinsheng Xie
The authors regret to inform that there were errors in the originally published article. The corrections are as follows:
1.On page 2, the geographical coordinates were incorrectly formatted as "25°38 ′25 ′N, 116° 25′29′E". The correct formatting should be "25°38′25″N, 116°25′29″E".
2.On page 4, there is an error in Eqn (7). The correct equation should be: 13C-PLFA = [(13Catom%)PLFA, treatment - (13Catom%)PLFA, control]/100 × PLFA
{"title":"Corrigendum to “Input of high-quality litter reduces soil carbon losses due to priming in a subtropical pine forest” [Soil Biology and Biochemistry 194 (2024) 109444]","authors":"Shiting Li, Maokui Lyu, Cui Deng, Wei Deng, Xiaohong Wang, Anne Cao, Yongmeng Jiang, Jueling Liu, Yuming Lu, Jinsheng Xie","doi":"10.1016/j.soilbio.2024.109652","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109652","url":null,"abstract":"The authors regret to inform that there were errors in the originally published article. The corrections are as follows:<ul><li><span>1.</span><span>On page 2, the geographical coordinates were incorrectly formatted as \"25°38 ′25 ′N, 116° 25′29′E\". The correct formatting should be \"25°38′25″N, 116°25′29″E\".</span></li><li><span>2.</span><span>On page 4, there is an error in Eqn (7). The correct equation should be: <sup>13</sup>C-PLFA = [(<sup>13</sup>Catom%)<sub>PLFA, treatment</sub> - (<sup>13</sup>Catom%)<sub>PLFA, control</sub>]/100 × PLFA</span></li></ul>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"22 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-12-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142758588","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Mineral-associated organic matter (MAOM) is an important carbon reservoir in relation to soil organic carbon sequestration over long timescales, and its saturation status is pertinent to the judicious formulation of agricultural management practices and global climate mitigation strategies. However, the existence of MAOM saturation is controversial due to the ambiguity of the MAOM concept and the variability of the underlying model. Based on this, we update and extend the concept of MAOM saturation into theoretical and apparent components, and propose the hypothesis that clay minerals, microbial communities, and input organic matter regulate the apparent saturation of MAOM. The theoretical saturation of MAOM represents the maximum sequestration potential of MAOM in natural soil ecosystems, which may require update of many current models of global carbon sequestration. In contrast, apparent saturation of MAOM capacity can be derived by comparing natural ecosystems with ecosystems subject to anthropogenic disturbances, and by monitoring single ecosystems on annual time scales over many years. Future research therefore needs to consider some new indicators and models to study MAOM saturation.
{"title":"The need to update and refine concepts relating to mineral-associated organic matter saturation in soil","authors":"Xiaojun Song, Huijun Wu, Shengping Li, Ping He, Xueping Wu","doi":"10.1016/j.soilbio.2024.109672","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109672","url":null,"abstract":"Mineral-associated organic matter (MAOM) is an important carbon reservoir in relation to soil organic carbon sequestration over long timescales, and its saturation status is pertinent to the judicious formulation of agricultural management practices and global climate mitigation strategies. However, the existence of MAOM saturation is controversial due to the ambiguity of the MAOM concept and the variability of the underlying model. Based on this, we update and extend the concept of MAOM saturation into theoretical and apparent components, and propose the hypothesis that clay minerals, microbial communities, and input organic matter regulate the apparent saturation of MAOM. The theoretical saturation of MAOM represents the maximum sequestration potential of MAOM in natural soil ecosystems, which may require update of many current models of global carbon sequestration. In contrast, apparent saturation of MAOM capacity can be derived by comparing natural ecosystems with ecosystems subject to anthropogenic disturbances, and by monitoring single ecosystems on annual time scales over many years. Future research therefore needs to consider some new indicators and models to study MAOM saturation.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"260 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-11-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142756360","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.soilbio.2024.109662
Thomas Dussarrat, Claudio Latorre, Millena C. Barros Santos, Constanza Aguado-Norese, Sylvain Prigent, Francisca P. Díaz, Dominique Rolin, Mauricio González, Caroline Müller, Rodrigo A. Gutiérrez, Pierre Pétriacq
Plants modulate their rhizochemistry, which affects soil bacterial communities and, ultimately, plant performance. Although our understanding of rhizochemistry is growing, knowledge of its responses to abiotic constraints is limited, especially in realistic ecological contexts. Here, we combined predictive metabolomics with soil metagenomics to investigate how rhizochemistry responded to environmental constraints and how it in turn shaped soil bacterial communities across stress gradients in the Atacama Desert. We found that rhizochemical adjustments predicted the environment (i.e. elevation, R2 between 96% and 74%) of two plant species, identifying rhizochemical markers for plant resilience to harsh edaphic conditions. These metabolites (e.g. glutamic and succinic acid, catechins) were consistent across years and could predict the elevation of two independent plant species, suggesting biochemical convergence. Next, convergent patterns in the dynamics of bacterial communities were also observed across the elevation gradient. Finally, rhizosphere predictors were associated with variation in composition and abundance of bacterial species. Biochemical markers and convergences as well as potential roles of associated predictive bacterial families reflected the requirements for plant life under extreme conditions. This included biological processes such as nitrogen and water starvation (e.g. glutamic and organic acids, Bradyrhizobiaceae), metal pollution (e.g. Caulobacteraceae) and plant development and defence (e.g. flavonoids, lipids, Chitinophagaceae). Overall, findings highlighted convergent patterns belowground, which represent exciting insights in the context of evolutionary biology, and may indicate unique metabolic sets also relevant for crop engineering and soil quality diagnostics. Besides, the results emphasise the need to integrate ecology with omics approaches to explore plant-soil interactions and better predict their responses to climate change.
{"title":"Rhizochemistry and soil bacterial community are tailored to natural stress gradients.","authors":"Thomas Dussarrat, Claudio Latorre, Millena C. Barros Santos, Constanza Aguado-Norese, Sylvain Prigent, Francisca P. Díaz, Dominique Rolin, Mauricio González, Caroline Müller, Rodrigo A. Gutiérrez, Pierre Pétriacq","doi":"10.1016/j.soilbio.2024.109662","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109662","url":null,"abstract":"Plants modulate their rhizochemistry, which affects soil bacterial communities and, ultimately, plant performance. Although our understanding of rhizochemistry is growing, knowledge of its responses to abiotic constraints is limited, especially in realistic ecological contexts. Here, we combined predictive metabolomics with soil metagenomics to investigate how rhizochemistry responded to environmental constraints and how it in turn shaped soil bacterial communities across stress gradients in the Atacama Desert. We found that rhizochemical adjustments predicted the environment (<em>i.e.</em> elevation, R<sup>2</sup> between 96% and 74%) of two plant species, identifying rhizochemical markers for plant resilience to harsh edaphic conditions. These metabolites (<em>e.g.</em> glutamic and succinic acid, catechins) were consistent across years and could predict the elevation of two independent plant species, suggesting biochemical convergence. Next, convergent patterns in the dynamics of bacterial communities were also observed across the elevation gradient. Finally, rhizosphere predictors were associated with variation in composition and abundance of bacterial species. Biochemical markers and convergences as well as potential roles of associated predictive bacterial families reflected the requirements for plant life under extreme conditions. This included biological processes such as nitrogen and water starvation (<em>e.g.</em> glutamic and organic acids, Bradyrhizobiaceae), metal pollution (<em>e.g.</em> Caulobacteraceae) and plant development and defence (<em>e.g.</em> flavonoids, lipids, Chitinophagaceae). Overall, findings highlighted convergent patterns belowground, which represent exciting insights in the context of evolutionary biology, and may indicate unique metabolic sets also relevant for crop engineering and soil quality diagnostics. Besides, the results emphasise the need to integrate ecology with omics approaches to explore plant-soil interactions and better predict their responses to climate change.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"65 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713016","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Soil organic matter (SOM) is partitioned among structurally and functionally distinct pools. Information on these different SOM fractions in mangrove environments are emerging and the three-pool classification of SOM into particulate organic matter (POM), mineral-associated organic matter (MAOM) and dissolved organic matter (DOM) has become the operational framework of most mangrove studies. The differences in degree of protection provided by physical and chemical mechanisms against microbial decomposition of these fractions lay a strong foundation for empirical SOM studies in mangroves. In this review, we discuss the formation and transformation pathways and stabilization mechanisms of these SOM fractions in mangroves under different environmental conditions. We also show that further studies on lesser-known forms of SOM such as FeS-MAOM, pyrite-MAOM, and Al-MAOM could set a path better understanding long-term stabilization of mangrove SOM. The binding capacity of sediments with DOM points to a hidden potential of mangroves to store soil carbon, which is not accounted in traditional sediment and carbon accumulation models. In addition, incorporating the feedback from SOM fractions to different physiochemical and climatic conditions can improve carbon dynamic projections in mangrove ecosystems using carbon models.
土壤有机质（SOM）在结构上和功能上分为不同的池。有关红树林环境中这些不同 SOM 部分的信息不断涌现，SOM 的三池分类法已成为大多数红树林研究的操作框架，即颗粒有机物（POM）、矿物相关有机物（MAOM）和溶解有机物（DOM）。物理和化学机制对这些部分微生物分解提供的保护程度不同，这为红树林 SOM 的实证研究奠定了坚实的基础。在本综述中，我们讨论了不同环境条件下红树林中这些 SOM 部分的形成和转化途径以及稳定机制。我们还表明，进一步研究鲜为人知的 SOM 形式，如 FeS-MAOM、黄铁矿-MAOM 和 Al-MAOM，可以更好地了解红树林 SOM 的长期稳定机制。沉积物与 DOM 的结合能力表明，红树林具有储存土壤碳的隐藏潜力，而传统的沉积物和碳累积模型并未考虑到这一点。此外，将 SOM 部分对不同物理化学和气候条件的反馈纳入碳模型，可以改善红树林生态系统的碳动态预测。
{"title":"A review of properties of organic matter fractions in soils of mangrove wetlands: Implications for carbon storage","authors":"Pestheruwe Liyanaralalage Iroshaka Gregory Marcelus Cooray , Gareth Chalmers , David Chittleborough","doi":"10.1016/j.soilbio.2024.109660","DOIUrl":"10.1016/j.soilbio.2024.109660","url":null,"abstract":"<div><div>Soil organic matter (SOM) is partitioned among structurally and functionally distinct pools. Information on these different SOM fractions in mangrove environments are emerging and the three-pool classification of SOM into particulate organic matter (POM), mineral-associated organic matter (MAOM) and dissolved organic matter (DOM) has become the operational framework of most mangrove studies. The differences in degree of protection provided by physical and chemical mechanisms against microbial decomposition of these fractions lay a strong foundation for empirical SOM studies in mangroves. In this review, we discuss the formation and transformation pathways and stabilization mechanisms of these SOM fractions in mangroves under different environmental conditions. We also show that further studies on lesser-known forms of SOM such as FeS-MAOM, pyrite-MAOM, and Al-MAOM could set a path better understanding long-term stabilization of mangrove SOM. The binding capacity of sediments with DOM points to a hidden potential of mangroves to store soil carbon, which is not accounted in traditional sediment and carbon accumulation models. In addition, incorporating the feedback from SOM fractions to different physiochemical and climatic conditions can improve carbon dynamic projections in mangrove ecosystems using carbon models.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109660"},"PeriodicalIF":9.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713088","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-26DOI: 10.1016/j.soilbio.2024.109656
Minghui Liu, Hanyang Lin, Junmin Li
Microbial carbon (C) use efficiency (CUE) is a comprehensive parameter to measure the accumulation and loss of soil C caused by microbial growth and respiration, which is considered to determine the fate of soil organic C (SOC). Microbial CUE is sensitive to the changes in soil nutrients, such as nitrogen (N) and phosphorus, making it crucial to assess the response of microbial CUE to nutrient inputs caused by climate change and human activities, as well as its contribution to SOC accumulation. Here, we curated a dataset from 58 studies (389 paired observations) to examine the effects of nutrient inputs on global soil microbial CUE and the relationship between microbial CUE and SOC. The meta-analysis showed that nutrient inputs increased soil microbial CUE by 11.5%. The response of microbial CUE to nutrient inputs varied among different treatments (i.e., nutrient form, application rates in N, and experiment duration), ecosystems, and climatic factors. The variable response of microbial CUE to nutrient inputs was mainly affected by the changes of soil N availability and C-, N-related hydrolase activity, showing significant positive and negative relationships, respectively. There was no significant statistic correlation between microbial CUE and SOC under the condition of nutrient inputs. While a significant positive correlation was observed between microbial CUE and SOC under both inorganic and short-term nutrient inputs. The present study sheds light on a comprehensive understanding of microbial CUE in the global range of nutrient inputs, and highlights the need for more studies paying more attention to the role of microbial CUE in SOC sequestration.
{"title":"Are there links between nutrient inputs and the response of microbial carbon use efficiency or soil organic carbon? A meta-analysis","authors":"Minghui Liu, Hanyang Lin, Junmin Li","doi":"10.1016/j.soilbio.2024.109656","DOIUrl":"10.1016/j.soilbio.2024.109656","url":null,"abstract":"<div><div>Microbial carbon (C) use efficiency (CUE) is a comprehensive parameter to measure the accumulation and loss of soil C caused by microbial growth and respiration, which is considered to determine the fate of soil organic C (SOC). Microbial CUE is sensitive to the changes in soil nutrients, such as nitrogen (N) and phosphorus, making it crucial to assess the response of microbial CUE to nutrient inputs caused by climate change and human activities, as well as its contribution to SOC accumulation. Here, we curated a dataset from 58 studies (389 paired observations) to examine the effects of nutrient inputs on global soil microbial CUE and the relationship between microbial CUE and SOC. The meta-analysis showed that nutrient inputs increased soil microbial CUE by 11.5%. The response of microbial CUE to nutrient inputs varied among different treatments (i.e., nutrient form, application rates in N, and experiment duration), ecosystems, and climatic factors. The variable response of microbial CUE to nutrient inputs was mainly affected by the changes of soil N availability and <em>C</em>-, <em>N</em>-related hydrolase activity, showing significant positive and negative relationships, respectively. There was no significant statistic correlation between microbial CUE and SOC under the condition of nutrient inputs. While a significant positive correlation was observed between microbial CUE and SOC under both inorganic and short-term nutrient inputs. The present study sheds light on a comprehensive understanding of microbial CUE in the global range of nutrient inputs, and highlights the need for more studies paying more attention to the role of microbial CUE in SOC sequestration.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109656"},"PeriodicalIF":9.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142713012","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-25DOI: 10.1016/j.soilbio.2024.109661
Yanchun Liu , Hui Wang , Andreas Schindlbacher , Shirong Liu , Yujing Yang , Huimin Tian , Lin Chen , Angang Ming , Jian Wang , Jiachen Li , Zuwei Tian
The chemical composition and degradability of soil organic matter (SOM) are among the most important factors influencing the feedback between soil CO2 emissions and climate warming. We hypothesized that the response of soil respiration to long-term warming in various forest ecosystems depends on how soil warming alters the chemical composition of SOM. Therefore, we compared the effects of long-term soil warming on soil respiration, SOM molecular structure, and bacterial and fungal diversity in two forest ecosystems in the southern subtropical and warm temperate zones of China. In the subtropical forest, soil warming did not affect soil respiration in the short term (2–3 years) but decreased it in the longer term (10 years, −10%). The decline in soil respiration was associated with an increased aliphaticity of SOM and lower O-alkyl C content, along with an increased abundance of microbial K-strategists over time. In the warm temperate forest, soil warming significantly stimulated soil respiration by 35% in the short term and 30% in the long term. The sustained positive response to warming was likely related to the increased decomposability of SOM owing to increased root C input. Our results suggest that the molecular composition of SOM is affected by warming and in turn feeds back to longer-term soil respiration responses. The different responses at the two study sites suggest considerable variation in the feedback within different forest ecosystems.
土壤有机质（SOM）的化学成分和降解性是影响土壤二氧化碳排放与气候变暖之间反馈的最重要因素之一。我们假设，在各种森林生态系统中，土壤呼吸对长期变暖的响应取决于土壤变暖如何改变 SOM 的化学组成。因此，我们比较了中国南亚热带和暖温带两个不同森林生态系统中长期土壤变暖对土壤呼吸、SOM分子结构以及细菌和真菌多样性的影响。在亚热带森林中，土壤变暖在短期内（2-3 年）不影响土壤呼吸作用，但在长期内（10 年，-10.3%）会降低土壤呼吸作用。土壤呼吸作用的下降与 SOM 脂肪族含量的增加和 O- 烷基 C 含量的减少有关，同时随着时间的推移，微生物 K-策略分子的数量也在增加。在暖温带森林中，土壤变暖显著促进了土壤呼吸作用，短期为 35.3%，长期为 29.8%。对气候变暖的持续积极反应可能与根部 C 输入量增加导致 SOM 可分解性提高有关。我们的研究结果表明，SOM 的分子组成受气候变暖的影响，进而反馈到长期的土壤呼吸反应中。两个研究地点的不同反应表明，不同森林生态系统之间的反馈存在很大差异。
{"title":"Soil respiration related to the molecular composition of soil organic matter in subtropical and temperate forests under soil warming","authors":"Yanchun Liu , Hui Wang , Andreas Schindlbacher , Shirong Liu , Yujing Yang , Huimin Tian , Lin Chen , Angang Ming , Jian Wang , Jiachen Li , Zuwei Tian","doi":"10.1016/j.soilbio.2024.109661","DOIUrl":"10.1016/j.soilbio.2024.109661","url":null,"abstract":"<div><div>The chemical composition and degradability of soil organic matter (SOM) are among the most important factors influencing the feedback between soil CO<sub>2</sub> emissions and climate warming. We hypothesized that the response of soil respiration to long-term warming in various forest ecosystems depends on how soil warming alters the chemical composition of SOM. Therefore, we compared the effects of long-term soil warming on soil respiration, SOM molecular structure, and bacterial and fungal diversity in two forest ecosystems in the southern subtropical and warm temperate zones of China. In the subtropical forest, soil warming did not affect soil respiration in the short term (2–3 years) but decreased it in the longer term (10 years, −10%). The decline in soil respiration was associated with an increased aliphaticity of SOM and lower O-alkyl C content, along with an increased abundance of microbial K-strategists over time. In the warm temperate forest, soil warming significantly stimulated soil respiration by 35% in the short term and 30% in the long term. The sustained positive response to warming was likely related to the increased decomposability of SOM owing to increased root C input. Our results suggest that the molecular composition of SOM is affected by warming and in turn feeds back to longer-term soil respiration responses. The different responses at the two study sites suggest considerable variation in the feedback within different forest ecosystems.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109661"},"PeriodicalIF":9.8,"publicationDate":"2024-11-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142696629","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-24DOI: 10.1016/j.soilbio.2024.109659
Yang Hu , Tianle Kou , Mengfei Cong , Yuanbin Jia , Han Yan , Xingyun Huang , Zailei Yang , Shaoshan An , Hongtao Jia
Soil micro-food webs play a vital role in sustaining soil carbon cycling and stocks through the activities and interactions of individual organisms. However, grassland degradation disrupts these micro-food webs and is expected to reduce soil carbon stocks. This hypothesis was tested along degradation transects that were established in alpine meadows and steppes in arid regions, examining how multitrophic organisms and microbial metabolic efficiency respond to grassland degradation and how these responses relate to soil organic carbon (SOC). Grassland degradation reduced microbial necromass accumulation coefficient (the ratio of microbial necromass carbon to microbial biomass carbon) and increased microbial metabolic quotient (the ratio of soil respiration rate to microbial biomass carbon), indicating that microbes may prioritize SOC decomposition for resource acquisition over growth and necromass accumulation. Degradation led to increased bacterial and fungal diversity, reduced protist and nematode diversity, and simplified the structure of micro-food web (network complexity). Overall, grassland degradation reduced microbial metabolic efficiency, linked to reduced plant biomass, lower soil clay content, and a simplified micro-food web—particularly weakening interactions among microbes, microbivores, and predators—which is associated with SOC loss in degraded grasslands. These findings indicate the necessity of maintaining micro-food web structures to promote soil carbon sequestration in degraded grasslands.
{"title":"Grassland degradation-induced soil organic carbon loss associated with micro-food web simplification","authors":"Yang Hu , Tianle Kou , Mengfei Cong , Yuanbin Jia , Han Yan , Xingyun Huang , Zailei Yang , Shaoshan An , Hongtao Jia","doi":"10.1016/j.soilbio.2024.109659","DOIUrl":"10.1016/j.soilbio.2024.109659","url":null,"abstract":"<div><div>Soil micro-food webs play a vital role in sustaining soil carbon cycling and stocks through the activities and interactions of individual organisms. However, grassland degradation disrupts these micro-food webs and is expected to reduce soil carbon stocks. This hypothesis was tested along degradation transects that were established in alpine meadows and steppes in arid regions, examining how multitrophic organisms and microbial metabolic efficiency respond to grassland degradation and how these responses relate to soil organic carbon (SOC). Grassland degradation reduced microbial necromass accumulation coefficient (the ratio of microbial necromass carbon to microbial biomass carbon) and increased microbial metabolic quotient (the ratio of soil respiration rate to microbial biomass carbon), indicating that microbes may prioritize SOC decomposition for resource acquisition over growth and necromass accumulation. Degradation led to increased bacterial and fungal diversity, reduced protist and nematode diversity, and simplified the structure of micro-food web (network complexity). Overall, grassland degradation reduced microbial metabolic efficiency, linked to reduced plant biomass, lower soil clay content, and a simplified micro-food web—particularly weakening interactions among microbes, microbivores, and predators—which is associated with SOC loss in degraded grasslands. These findings indicate the necessity of maintaining micro-food web structures to promote soil carbon sequestration in degraded grasslands.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109659"},"PeriodicalIF":9.8,"publicationDate":"2024-11-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142694245","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-23DOI: 10.1016/j.soilbio.2024.109657
Mengqi Wu , Xiaoli Yang , Thomas Reitz , Evgenia Blagodatskaya , Nico Eisenhauer , Martin Schädler , Steffen Schlüter
Soil nematodes are valuable bioindicators for the ecological status of soils. Nematode community properties are known to be altered by land-use intensity, to vary with seasonal dynamics, and to be affected by climate change. These external drivers also affect a range of structural, physical, and biochemical soil properties. However, it is unclear whether shifts in nematode community properties are the result of changing resource accessibility in the soil or whether these just co-occur.
Here, we linked nematode community to microhabitat properties of intact soils and biochemical properties of bulk soils from a long-term field trial on land-use intensity (cropland vs. grassland) and simulated climate change (ambient vs. future climate). Soil samples were taken in two seasons (November vs. June) to capture a wide range of climatic conditions. The objective of the study was to investigate whether the resource accessibility imposed by microhabitat properties would regulate nematode communities and whether the strength of bottom-up regulation depended on climate change, land use intensification, seasonality and their interactions.
Land-use and seasonality had clearly separable effects on nematode community composition. The coupling of physical microstructure properties with nematode community properties depended on land use. In cropland, nematode abundance was strongly associated with the features of the habitable pore space, such as nematode-specific porosity, pore connectivity, and particulate organic matter. Grassland nematode communities were independent of these measurable habitat properties and featured stronger co-occurrence networks. The effect of increased temperature and shifting precipitation patterns on nematode community properties were generally smaller, varied with land use and season, and were not linked to concomitant changes in microhabitat properties.
Our findings indicate that characterizing microhabitat properties might be a promising approach to help explain the notorious variability in nematode community composition. The strength of bottom-up regulation by resource accessibility could be a valuable indicator of the resilience of nematode communities to environmental stresses and perturbations.
{"title":"Microhabitat properties explain variations in soil nematode communities across climate conditions in cropland, but not in grassland","authors":"Mengqi Wu , Xiaoli Yang , Thomas Reitz , Evgenia Blagodatskaya , Nico Eisenhauer , Martin Schädler , Steffen Schlüter","doi":"10.1016/j.soilbio.2024.109657","DOIUrl":"10.1016/j.soilbio.2024.109657","url":null,"abstract":"<div><div>Soil nematodes are valuable bioindicators for the ecological status of soils. Nematode community properties are known to be altered by land-use intensity, to vary with seasonal dynamics, and to be affected by climate change. These external drivers also affect a range of structural, physical, and biochemical soil properties. However, it is unclear whether shifts in nematode community properties are the result of changing resource accessibility in the soil or whether these just co-occur.</div><div>Here, we linked nematode community to microhabitat properties of intact soils and biochemical properties of bulk soils from a long-term field trial on land-use intensity (cropland vs. grassland) and simulated climate change (ambient vs. future climate). Soil samples were taken in two seasons (November vs. June) to capture a wide range of climatic conditions. The objective of the study was to investigate whether the resource accessibility imposed by microhabitat properties would regulate nematode communities and whether the strength of bottom-up regulation depended on climate change, land use intensification, seasonality and their interactions.</div><div>Land-use and seasonality had clearly separable effects on nematode community composition. The coupling of physical microstructure properties with nematode community properties depended on land use. In cropland, nematode abundance was strongly associated with the features of the habitable pore space, such as nematode-specific porosity, pore connectivity, and particulate organic matter. Grassland nematode communities were independent of these measurable habitat properties and featured stronger co-occurrence networks. The effect of increased temperature and shifting precipitation patterns on nematode community properties were generally smaller, varied with land use and season, and were not linked to concomitant changes in microhabitat properties.</div><div>Our findings indicate that characterizing microhabitat properties might be a promising approach to help explain the notorious variability in nematode community composition. The strength of bottom-up regulation by resource accessibility could be a valuable indicator of the resilience of nematode communities to environmental stresses and perturbations.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109657"},"PeriodicalIF":9.8,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690768","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-23DOI: 10.1016/j.soilbio.2024.109658
Ari Fina Bintarti , Elena Kost , Dominika Kundel , Rafaela Feola Conz , Paul Mäder , Hans-Martin Krause , Jochen Mayer , Laurent Philippot , Martin Hartmann
The severity of drought is predicted to increase across Europe due to climate change. Droughts can substantially impact terrestrial nitrogen (N) cycling and the corresponding microbial communities. Here, we investigated how ammonia-oxidizing bacteria (AOB), archaea (AOA), and complete ammonia oxidizers (comammox) as well as inorganic N pools and N2O fluxes respond to simulated drought under different cropping systems. A rain-out shelter experiment was conducted as part of a long-term field experiment comparing cropping systems that differed mainly in fertilization strategy (organic, mineral, or mixed mineral and organic) and plant protection management (biodynamic versus conventional pesticide use). We found that the effect of drought varied depending on the specific ammonia-oxidizing (AO) groups and the type of cropping system. Drought had the greatest impact on the structure of the AOA community compared to the other AO groups. The abundance of ammonia oxidizers was also affected by drought, with comammox clade B exhibiting the highest sensitivity. Additionally, drought had, overall, a stronger impact on the AO community structure in the biodynamic cropping system than in the mixed and mineral-fertilized conventional systems. The responses of ammonia-oxidizing communities to drought were comparable between bulk soil and rhizosphere. We observed a significant increase in NH4+ and NO3− pools during the drought period, which then decreased after rewetting, indicating a strong resilience. We further found that drought altered the complex relationships between AO communities and mineral N pools, as well as N2O fluxes. These results highlight the importance of agricultural management practices in influencing the response of nitrogen cycling guilds and their processes to drought.
据预测，整个欧洲的干旱严重程度将因气候变化而加剧。干旱会严重影响陆地氮（N）循环和相应的微生物群落。在此，我们研究了氨氧化细菌（AOB）、古菌（AOA）、完全氨氧化剂（comammox）以及无机氮库和一氧化二氮通量在不同种植系统下如何应对模拟干旱。作为长期田间试验的一部分，我们进行了一次避雨试验，比较了主要在施肥策略（有机肥、矿物质肥或矿物质与有机肥混合施肥）和植保管理（生物动力施肥与常规农药使用）方面不同的耕作制度。我们发现，干旱的影响因特定的氨氧化（AO）群体和种植系统类型而异。与其他氨氧化物群相比，干旱对氨氧化物群落结构的影响最大。氨氧化剂的丰度也受到干旱的影响，Comammox 支系 B 的敏感性最高。此外，总体而言，干旱对生物动力耕作系统中的氨氧化物群落结构的影响要大于混合耕作系统和矿物肥料常规耕作系统。氨氧化群落对干旱的反应在块状土壤和根瘤层中具有可比性。我们观察到，在干旱期间，NH4+ 和 NO3- 池明显增加，复湿后又有所减少，这表明氨氧化群落具有很强的恢复能力。我们还发现，干旱改变了氧化亚氮群落和矿物氮库之间的复杂关系，以及氧化亚氮通量。这些结果凸显了农业管理方法在影响氮循环类群及其过程对干旱的响应方面的重要性。
{"title":"Cropping system modulates the effect of spring drought on ammonia-oxidizing communities","authors":"Ari Fina Bintarti , Elena Kost , Dominika Kundel , Rafaela Feola Conz , Paul Mäder , Hans-Martin Krause , Jochen Mayer , Laurent Philippot , Martin Hartmann","doi":"10.1016/j.soilbio.2024.109658","DOIUrl":"10.1016/j.soilbio.2024.109658","url":null,"abstract":"<div><div>The severity of drought is predicted to increase across Europe due to climate change. Droughts can substantially impact terrestrial nitrogen (N) cycling and the corresponding microbial communities. Here, we investigated how ammonia-oxidizing bacteria (AOB), archaea (AOA), and complete ammonia oxidizers (comammox) as well as inorganic N pools and N<sub>2</sub>O fluxes respond to simulated drought under different cropping systems. A rain-out shelter experiment was conducted as part of a long-term field experiment comparing cropping systems that differed mainly in fertilization strategy (organic, mineral, or mixed mineral and organic) and plant protection management (biodynamic versus conventional pesticide use). We found that the effect of drought varied depending on the specific ammonia-oxidizing (AO) groups and the type of cropping system. Drought had the greatest impact on the structure of the AOA community compared to the other AO groups. The abundance of ammonia oxidizers was also affected by drought, with comammox clade B exhibiting the highest sensitivity. Additionally, drought had, overall, a stronger impact on the AO community structure in the biodynamic cropping system than in the mixed and mineral-fertilized conventional systems. The responses of ammonia-oxidizing communities to drought were comparable between bulk soil and rhizosphere. We observed a significant increase in NH<sub>4</sub><sup>+</sup> and NO<sub>3</sub><sup>−</sup> pools during the drought period, which then decreased after rewetting, indicating a strong resilience. We further found that drought altered the complex relationships between AO communities and mineral N pools, as well as N<sub>2</sub>O fluxes. These results highlight the importance of agricultural management practices in influencing the response of nitrogen cycling guilds and their processes to drought.</div></div>","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"201 ","pages":"Article 109658"},"PeriodicalIF":9.8,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690710","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2024-11-23DOI: 10.1016/j.soilbio.2024.109654
Brian Scott, Jon Zaloumis, Ferran Garcia-Pichel
Biocrusts are comprised of soil-dwelling microbes well known for stabilizing desert soils. Unstable soil is typically colonized first by motile cyanobacteria that can burrow under the surface to avoid sun exposure when in a dry state. They produce long, sticky sheaths and large trichome bundles that bind soil particles. Biocrusts dominated by such cyanobacteria are rather inconspicuous and thus termed “light biocrusts.” Some non-motile cyanobacteria can produce the dark sunscreen pigment scytonemin. They are typically considered to be secondary colonizers of the soil surface and their development marks the formation of “dark biocrusts.” Contrasting with this general paradigm, we observed both light and dark biocrusts growing side by side in a natural desert area in Pinal County, Arizona. Because light biocrusts developed as a band along a nearby dirt road, we hypothesized that aeolian dust deposition from road traffic may have contributed to this spatial patterning. To test this, we used inoculum from the natural site to grow biocrust in the laboratory with and without inputs of dust deposition, characterizing resulting biocrusts by appearance, microscopy, community composition based on 16S RNA, as well as proxy pigment analyses. Light biocrusts developed on soils receiving regular dust inputs, while undusted soils developed dark biocrust, an outcome traceable primarily to a more rapid growth of motile, non scytonemin-producing cyanobacteria under dust deposition. However, similar experiments carried out with well-developed crusts resisted dust-driven community shifts, even after extended treatments. We conclude that dust can swiftly affect community assembly pathways, but that it is much less of a factor, if at all, in driving shifts in established communities, and can partly explain biocrust spatial patterning in our site, and likely elsewhere.
{"title":"Aeolian dust deposition as a driver of cyanobacterial community structure in biological soil crusts","authors":"Brian Scott, Jon Zaloumis, Ferran Garcia-Pichel","doi":"10.1016/j.soilbio.2024.109654","DOIUrl":"https://doi.org/10.1016/j.soilbio.2024.109654","url":null,"abstract":"Biocrusts are comprised of soil-dwelling microbes well known for stabilizing desert soils. Unstable soil is typically colonized first by motile cyanobacteria that can burrow under the surface to avoid sun exposure when in a dry state. They produce long, sticky sheaths and large trichome bundles that bind soil particles. Biocrusts dominated by such cyanobacteria are rather inconspicuous and thus termed “light biocrusts.” Some non-motile cyanobacteria can produce the dark sunscreen pigment scytonemin. They are typically considered to be secondary colonizers of the soil surface and their development marks the formation of “dark biocrusts.” Contrasting with this general paradigm, we observed both light and dark biocrusts growing side by side in a natural desert area in Pinal County, Arizona. Because light biocrusts developed as a band along a nearby dirt road, we hypothesized that aeolian dust deposition from road traffic may have contributed to this spatial patterning. To test this, we used inoculum from the natural site to grow biocrust in the laboratory with and without inputs of dust deposition, characterizing resulting biocrusts by appearance, microscopy, community composition based on 16S RNA, as well as proxy pigment analyses. Light biocrusts developed on soils receiving regular dust inputs, while undusted soils developed dark biocrust, an outcome traceable primarily to a more rapid growth of motile, non scytonemin-producing cyanobacteria under dust deposition. However, similar experiments carried out with well-developed crusts resisted dust-driven community shifts, even after extended treatments. We conclude that dust can swiftly affect community assembly pathways, but that it is much less of a factor, if at all, in driving shifts in established communities, and can partly explain biocrust spatial patterning in our site, and likely elsewhere.","PeriodicalId":21888,"journal":{"name":"Soil Biology & Biochemistry","volume":"15 1","pages":""},"PeriodicalIF":9.7,"publicationDate":"2024-11-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142690761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":1,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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