Pedobiologia最新文献

Asian knotweed’s impacts on soil chemistry and enzyme activities are higher in soils with low-nutrient status 亚洲结缕草对土壤化学和酶活性的影响在低养分土壤中更大

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151002

Fanny Dommanget , Estelle Forey , Matthieu Chauvat , Amandine Erktan , Camille Noûs , Léa Daniès , Coralie Chesseron , Nicolas Fanin

Invasive alien plants such as Reynoutria spp. can drastically affect the composition of plant communities. Yet, whether and how these species also affect soil physicochemical properties and microbial functioning is still an unresolved question in the literature. Using a space-for-time substitution approach comparing invaded to uninvaded adjacent plots, we estimated the impacts of Reynoutria on soil biochemistry across nine contrasted sites in France by measuring soil carbon content, nutrient availability and enzyme activities. Soil under Reynoutria displayed higher carbon, nitrogen and phosphorus contents but no differences were detected regarding enzyme activities between invaded and uninvaded sites. Moreover, the magnitude of Reynoutria’s effects differed depending on local conditions, with greater effects when total carbon and phosphorus-related enzymes were relatively low. These data highlight that changes in soil nutrient availability might be primarily due to direct effects of Reynoutria on soil properties and microbial functioning. Higher impacts were observed in soils with low-nutrient status, suggesting a ‘niche construction ability’ of Reynoutria. Our results underscore the necessity of considering the context-dependency of Reynoutria on soil biochemistry and highlight that the impact of alien species belowground functioning depends on initial soil conditions.

外来入侵植物（如雷诺苔属植物）会严重影响植物群落的组成。然而，这些物种是否以及如何影响土壤理化性质和微生物功能，在文献中仍是一个悬而未决的问题。我们采用空间-时间替代法，比较了被入侵和未被入侵的相邻地块，通过测量土壤碳含量、养分可用性和酶活性，估算了雷诺氏菌对法国九个不同地点的土壤生物化学的影响。雷诺苔属下的土壤碳、氮和磷含量较高，但在酶活性方面，受侵染地块与未受侵染地块没有发现差异。此外，雷诺特里亚的影响程度因当地条件而异，在总碳和磷相关酶含量相对较低时，影响程度更大。这些数据突出表明，土壤养分供应的变化可能主要是由于雷诺特里亚对土壤特性和微生物功能的直接影响。在低养分土壤中观察到的影响更大，这表明雷诺氏藻具有 "生态位构建能力"。我们的研究结果突出表明，有必要考虑雷诺氏藻对土壤生物化学的环境依赖性，并强调外来物种对地下功能的影响取决于最初的土壤条件。

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引用次数: 0

Communicating about soil biodiversity: Insights from science editorials and future recommendations 宣传土壤生物多样性：科学社论的启示和未来建议

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151003

Yamina Pressler , Bailey M. McClymonds , Meena M. Balgopal

Given the urgency of the global soil degradation crisis, soil scientists must communicate the importance of soil as being part of nature and the critical need for conserving soil biodiversity. Drawing on a thematic analysis of editorials related to soil conservation and management, we analyzed common themes, key messages, and frames that authors used to advocate for change. Soil biodiversity was referred to in 8 of the 11 editorials, but it was less emphasized and discussed in less detail than messages centered around food production, water resources, and climate change. Editorials structured arguments around economic development, scientific and technical uncertainty, and morality and ethics. We believe future editorials should apply other persuasive frames including social progress, public accountability, and working-towards-compromise when advocating for soil biodiversity conservation. Soil ecologists can improve communications about soil biodiversity by (1) identifying an audience and selecting relevant key messages, (2) strategically applying a persuasive frame, and (3) amplifying diverse voices with a consistent message. We provide a guide for developing essays that encourages soil ecologists to shape discourse, advance policy priorities, and enable non-soil ecologists to communicate about soil biodiversity conservation.

鉴于全球土壤退化危机的紧迫性，土壤科学家必须宣传土壤作为自然一部分的重要性以及保护土壤生物多样性的迫切需要。通过对与土壤保护和管理相关的社论进行主题分析，我们分析了作者用来倡导变革的共同主题、关键信息和框架。在 11 篇社论中，有 8 篇提到了土壤生物多样性，但与围绕粮食生产、水资源和气候变化的信息相比，对土壤生物多样性的强调和讨论都较少。社论围绕经济发展、科学和技术的不确定性以及道德和伦理展开论述。我们认为，在倡导保护土壤生物多样性时，未来的社论应采用其他有说服力的框架，包括社会进步、公共责任和努力妥协。土壤生态学家可以通过以下方法改善有关土壤生物多样性的传播：（1）确定受众并选择相关的关键信息；（2）战略性地应用有说服力的框架；（3）用一致的信息放大不同的声音。我们为撰写论文提供了指南，鼓励土壤生态学家参与讨论、推进政策优先事项，并使非土壤生态学家能够就土壤生物多样性保护进行交流。

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引用次数: 0

Natural forest restoration enhanced abundance and changed composition of soil phosphorus cycling genes compared with plantations 与人工林相比，天然林恢复提高了土壤磷循环基因的丰度并改变了其组成

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151005

Yun Wang , Hua Zheng , Chi Zhang , Falin Chen , Jing Zeng , Zhiyun Ouyang

How and to what extent forest restoration type influences phosphorus (P) cycling genes on abundance, diversity, and composition remain poorly understood, limiting the assessment of forest restoration types. Using a high-throughput functional gene microarray, we compared the abundance, diversity, and composition of P cycling genes in naturally restored natural secondary forests, artificially restored native Masson pine plantations, and introduced slash pine plantations in the red soil region of southern China. The abundance of P cycling genes, particularly phytase genes involved in organic P mineralization, was the highest in soils of natural secondary forests, followed by native Masson pine plantations, and finally, introduced slash pine plantations. The correlation between P cycling gene abundance and available P content exhibited an inverse pattern. P cycling gene composition varied significantly among the three forest restoration types. The similarity of P cycling gene composition in native Masson pine plantations to that of natural secondary forests was larger than that observed in introduced slash pine plantations. The vegetation-related factors of the ShannonWiener diversity index of trees, litter stock, tree biomass, and fine root surface area, and soil properties of total P, available P, clay content, silt content, and pH, significantly correlated with the P cycling gene composition. Maintaining high tree diversity is critical for supporting a high abundance of P cycling genes, which is beneficial for maintaining a high P status and active P cycling in forest soils. Natural forest restoration enhanced the abundance and changed the composition of soil P cycling genes compared with plantations.

人们对森林恢复类型如何以及在多大程度上影响磷（P）循环基因的丰度、多样性和组成仍然知之甚少，这限制了对森林恢复类型的评估。利用高通量功能基因芯片，我们比较了中国南方红壤地区自然恢复的天然次生林、人工恢复的原生马松人工林和引进的斜伐松人工林中磷循环基因的丰度、多样性和组成。在天然次生林土壤中，钾循环基因的丰度最高，尤其是参与有机钾矿化的植酸酶基因，其次是原生马松人工林，最后是引进的斜纹松人工林。P 循环基因丰度与可用 P 含量之间的相关性呈反比。三种森林恢复类型的 P 循环基因组成差异很大。原生马松人工林的 P 循环基因组成与天然次生林的相似性大于引进的斜纹松人工林。与植被相关的因素，如树木的香农维纳多样性指数、枯落物存量、树木生物量和细根表面积，以及土壤特性，如总磷、可利用磷、粘土含量、淤泥含量和 pH 值，与碳循环基因组成有显著相关性。保持树木的高度多样性对于支持高浓度的P循环基因至关重要，而高浓度的P循环基因有利于保持森林土壤中的高P状态和活跃的P循环。与人工林相比，天然林恢复提高了土壤中钾循环基因的丰度并改变了其组成。

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引用次数: 0

Variations in soil fungal communities: Comparative insights from coniferous and mixed broadleaf-conifer forests 土壤真菌群落的变化：针叶林与阔叶-针叶混交林的比较研究

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151007

Dexing Chen , Qiongyi Zhang , Siyu Chen , Yuqing Lin , Yuanming Zhu , Weiwei Sun , Mingjiu Chen , Shuangquan Zou , Xin Qian

Soil fungal communities are intricately linked to their vegetative hosts, playing a crucial role in plant development, biogeochemical cycling, and the stability of forest ecosystems. Distinct forest types harbor unique soil fungal assemblages, each finely tuned to the prevailing environmental conditions and plant species, thereby fulfilling diverse ecological functions. This study used high-throughput sequencing methodologies to conduct an exhaustive assessment of the community structure, ecological process, and interaction networks of soil fungi within coniferous and mixed broadleaf-conifer forests. Our findings demonstrated significant differences in community structure across different functional groups (pathotroph, saprotroph, and symbiotroph) between mixed broadleaf-conifer forests and coniferous forests. The community structure of forest soil fungi was profoundly shaped by soil physicochemical attributes, including pH, organic matter, total phosphorus, and available nitrogen. The neutral community model indicated that stochastic processes were dominant in the structuring of fungal communities in both forest types; however, the proportion of deterministic processes was substantially greater in coniferous forests compared to mixed broadleaf-conifer forests. Furthermore, the soil fungal network structure in mixed broadleaf-conifer forests exhibited greater complexity compared to coniferous forests, with significant associations identified between specific soil physicochemical properties and the topological characteristics of fungal interaction networks in both forest types. These findings underscore the critical impact of forest type on the dynamics of soil fungal communities and their ecological functions, offering strategic insights for forest management practices that enhance ecosystem resilience and biodiversity conservation.

土壤真菌群落与其植被宿主有着错综复杂的联系，在植物生长发育、生物地球化学循环和森林生态系统的稳定性方面发挥着至关重要的作用。不同的森林类型蕴藏着独特的土壤真菌群落，每种真菌群落都与当时的环境条件和植物种类密切相关，从而发挥着不同的生态功能。本研究利用高通量测序方法对针叶林和阔叶-针叶混交林中土壤真菌的群落结构、生态过程和相互作用网络进行了详尽的评估。我们的研究结果表明，针阔叶混交林和针叶林中不同功能群（病原菌、嗜渍菌和共生菌）的群落结构存在显著差异。森林土壤真菌群落结构深受土壤理化属性（包括 pH 值、有机质、总磷和可利用氮）的影响。中性群落模型表明，随机过程在两种森林类型的真菌群落结构中都占主导地位；然而，与阔叶-针叶混交林相比，针叶林中确定性过程所占的比例要大得多。此外，与针叶林相比，阔叶-针叶混交林的土壤真菌网络结构表现出更大的复杂性，在两种森林类型中，特定的土壤理化性质与真菌相互作用网络的拓扑特征之间都存在显著的关联。这些发现强调了森林类型对土壤真菌群落动态及其生态功能的重要影响，为提高生态系统恢复能力和生物多样性保护的森林管理实践提供了战略性启示。

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引用次数: 0

Occurrence of plant suppression gradients through common mycorrhizal networks across ecological groups during successional dynamics 在演替动态过程中，各生态群落通过共同的菌根网络出现植物抑制梯度

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151006

Breynner G.P. Bertagnoli , José Antonio Pimenta , Arnaldo Colozzi Filho , Waldemar Zangaro

Plants can utilize the common mycorrhizal network (CMN) as a pathway for competition, enabling the suppression of other plants through an asymmetric distribution of resources. This study aimed to assess the competitive dynamics of CMN originating from adult Brachiaria brizantha plants, juvenile Heliocarpus popayanensis, and juvenile Cariniana estrellensis on the growth of seedlings of these three species. Plants and seedlings were cultivated in substrates containing native arbuscular mycorrhizal fungi (AMF). Analysis of variance was conducted, and means were compared using the Tukey test. The results indicated that seedling growth of all three species was significantly suppressed by the CMN originating from adult B. brizantha, moderately suppressed by the CMN from juvenile H. popayanensis, and weakly suppressed by the CMN from juvenile C. estrellensis. While the seedlings of B. brizantha initially experienced suppression, they eventually developed and suppressed the juvenile plants of both H. popayanensis and C. estrellensis, leading to a reversal of the nutrient flux. This shift corroborated the mechanism of reciprocal reward. The study observed the formation of a gradient in seedling suppression, with the strength of suppression inversely correlated with the advancement of ecological plant groups during succession. The establishment of the seedling suppression gradient was associated with variations in photosynthetic potential, mycorrhizal responsiveness, and root colonization intensity by AMF. The competition dynamics mediated by the CMN affect the composition and diversity of plant communities over time, reinforcing the importance of mycorrhizal interactions in plant ecology and ecosystem management, particularly in restoration and conservation contexts.

植物可以利用共同菌根网络（CMN）作为竞争途径，通过资源的不对称分配抑制其他植物。本研究的目的是评估来自成株Brachiaria brizantha、幼株Heliocarpus popayanensis和幼株Cariniana estrellensis的CMN对这三种植物幼苗生长的竞争动态。植物和幼苗是在含有本地丛枝菌根真菌（AMF）的基质中培育的。进行了方差分析，并用 Tukey 检验比较了平均值。结果表明，三种植物的幼苗生长都受到来自成年 B. brizantha 的 CMN 的显著抑制，受到来自幼年 H. popayanensis 的 CMN 的中度抑制，受到来自幼年 C. estrellensis 的 CMN 的弱度抑制。虽然 B. brizantha 的幼苗最初受到抑制，但它们最终发展起来并抑制了 H. popayanensis 和 C. estrellensis 的幼苗，导致营养通量逆转。这种转变证实了互惠奖赏机制。研究观察到幼苗抑制梯度的形成，抑制强度与生态植物群在演替过程中的进展成反比。幼苗抑制梯度的形成与光合作用潜力、菌根反应性和 AMF 根定植强度的变化有关。由 CMN 介导的竞争动态会随着时间的推移影响植物群落的组成和多样性，从而加强了菌根相互作用在植物生态学和生态系统管理中的重要性，尤其是在恢复和保护环境方面。

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引用次数: 0

Forest types matter for the community and co-occurrence network patterns of soil bacteria, fungi, and nematodes 森林类型对土壤细菌、真菌和线虫的群落和共生网络模式至关重要

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-11-01 DOI: 10.1016/j.pedobi.2024.151004

Yudai Kitagami , Yosuke Matsuda

Tree growth influences the biological, physical, and chemical properties of the soil through the input of different types of litter and various root exudates. However, our understanding of tree-mediated effects on the composition and diversity of soil biota remains limited. This study aimed to determine the effects of physically neighboring forest types (i.e., an artificial Japanese cedar (Cryptomeria japonica) plantation vs. a broadleaf (Quercus serrata) secondary forest) on individual bacterial, fungal, and nematode communities and the associations among these inter-kingdoms. Bacterial, fungal, and nematode aggregates were estimated using MiSeq high-throughput sequencing system. The amplicon sequence variant richness of fungi and nematodes was significantly greater in the cedar plantation than in the broadleaf forest, and the three soil biota community structures were significantly clustered among the forest types. Environmental factors such as soil pH, C, N, and C/N ratio significantly influenced the three soil biota community structures. The bacterial–fungal–nematode co-occurrence network of the broadleaf forest had more nodes and edges than that of the cedar plantation. Moreover, Ascomycota and Basidiomycota fungi mainly co-occurred with fungivorous nematodes in the cedar and broadleaf forests, respectively. Our results suggested that unique soil biota communities and characteristic co-occurrence network patterns were established among the tripartite inter-kingdom relationships between adjacent forest types.

树木的生长会通过输入不同类型的废弃物和各种根系渗出物来影响土壤的生物、物理和化学特性。然而，我们对树木对土壤生物群组成和多样性的影响的了解仍然有限。本研究旨在确定物理上相邻的森林类型（即人工日本雪松（Cryptomeria japonica）种植园与阔叶（Quercus serrata）次生林）对单个细菌、真菌和线虫群落的影响，以及这些群落之间的关联。利用 MiSeq 高通量测序系统对细菌、真菌和线虫群落进行了估计。结果表明，杉木人工林中真菌和线虫的扩增子序列变异丰富度明显高于阔叶林，三种土壤生物群落结构在不同森林类型中呈显著聚类。土壤 pH 值、C、N 和 C/N 比等环境因素对三种土壤生物群落结构有明显影响。与杉木人工林相比，阔叶林的细菌-真菌-线虫共生网络具有更多的节点和边缘。此外，在雪松林和阔叶林中，子囊菌群和担子菌群真菌分别主要与食菌线虫共生。我们的研究结果表明，在相邻森林类型之间的三方生物群落间关系中建立了独特的土壤生物群落和特征共生网络模式。

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引用次数: 0

Attraction of pitfall trap preservation fluids complicates the estimation of Collembola density 坑式捕捉器保存液的吸引力使啮齿目动物密度的估算变得复杂

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-10-18 DOI: 10.1016/j.pedobi.2024.151001

Alexander Bruckner , Carla Ott

Collembola (springtail) communities consist of three eco-morphologically defined life forms: the euedaphics dwell inside the soil matrix, the epedaphics (including atmobiotics) live on the ground and in vegetation, and the hemiedaphics are intermediate. The vast majority of springtail community studies focus on the belowground (eu- and hemiedaphic) forms that are generally collected by taking and extracting soil cores. Few investigations have dealt with epedaphic Collembola that are usually captured with pitfall traps, and only very few studies so far covered all three life forms. When epedaphic and belowground species are sampled using both methods simultaneously, core data (true densities, [individuals m⁻²]) and pitfall data (activity abundances, [individuals trap⁻¹ length of trapping period⁻¹]) may be analyzed independently, but are incompatible in a common statistical framework. As a remedy, two competing numerical approaches to estimate true densities from activity abundances have been described in literature: the nested-cross array and the two-circle method. Attraction or deterrence effects of trap preservation fluids bias the density estimation of the nested-cross array, but not of the two-circle method. To determine whether this bias may be expected for Collembola, and thus which of the two methods should be used in future studies, we experimentally tested potential effects of preservation fluids on trap catch rates. Three preservation fluids (sodium benzoate, propylene glycol, formaldehyde) and a detergent (Tween80) significantly increased the number of captured springtails, thus demonstrating an attraction effect and the deficiency of the nested-cross array. In future studies of collembolan communities, we therefore suggest complementing the traditional focus on the eu- and hemiedaphic life forms by sampling epedaphic species using pitfalls, and subsequently remodelling the trapping data with the two-circle method.

鞘尾类群落由三种生态形态定义的生命形式组成：雌鞘类生活在土壤基质中，雄鞘类（包括大气生物）生活在地面和植被中，而半鞘类则处于中间状态。绝大多数的春尾草群落研究都集中在地下（雌雄同体和半雌雄同体），一般通过采集和提取土芯来收集。很少有研究涉及到通常使用坑式陷阱捕获的表生鞘翅目昆虫，迄今为止只有极少数研究涵盖了所有三种生命形式。当同时使用两种方法对表生和地下物种进行取样时，岩心数据（真实密度，[个体 m-2]）和坑阱数据（活动丰度，[个体陷阱-1 陷坑期长度-1]）可以独立分析，但在一个共同的统计框架中却互不兼容。作为一种补救措施，文献中描述了两种从活动丰度估算真实密度的相互竞争的数值方法：嵌套交叉阵列法和双圆法。捕集器保存液的吸引或威慑效应会使嵌套交叉阵列法的密度估算产生偏差，但不会使双圆法的密度估算产生偏差。为了确定这种偏差是否会对褶虫造成影响，从而确定在未来的研究中应采用哪种方法，我们通过实验测试了防腐液对诱捕器捕获率的潜在影响。三种保存液（苯甲酸钠、丙二醇、甲醛）和一种洗涤剂（吐温80）显著增加了捕获的鞘尾数量，从而证明了吸引效应和嵌套交叉阵列的不足。因此，在今后的鞘翅目群落研究中，我们建议在传统的重点研究雌雄同体生物的基础上，利用陷阱对雌雄同体物种进行取样，然后用双圈法重新修改诱捕数据。

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引用次数: 0

Insecticide exposure can increase burrow network production and alter burrow network structure in soil dwelling insects (Agriotes spp.) 暴露于杀虫剂会增加土栖昆虫（Agriotes spp.）

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-10-10 DOI: 10.1016/j.pedobi.2024.151000

Samuel W. Booth , Benedikt Kurtz , Martine I.de Heer , Sacha J. Mooney , Craig J. Sturrock

Insecticide treated seeds are commonly used to reduce yield losses from burrowing insect damage such as wireworms. Using temporal X-ray Computed Tomography (CT) of soil-filled bioassays, we aimed to quantify changes in burrow network production and structure as a measure of wireworm behavioural change in response to three types of insecticide treated maize seed; compound X (R&D product in field trial stage of development); tefluthrin and thiamethoxam. A biopesticide alternative treatment (neem), untreated maize seed and bare soil were also investigated. Insect health outcomes were also monitored to provide toxicity/mortality data. Wireworms exposed to compound X produced greater burrow networks than untreated maize and neem treatments, similar to that in volume of those produced in bare soil. Compound X exposure also elicited the production of more complex burrow structures, a function of the number of vertices, edges and faces of a shape (V-E+F) related to the number of interconnected branches, compared to any other treatments. Compound X, tefluthrin and thiamethoxam induced mortality at greater rates than neem or untreated, suggesting all three could have potential to manage wireworm populations and reduce yield loss, but only compound X modified burrowing behaviour. With soil biopores playing an important role in soil productivity and carbon sequestration, the wider implications of this increase in burrowing activity for food security and climate change warrants further exploration.

杀虫剂处理过的种子通常用于减少钻蛀性昆虫（如铁线虫）造成的产量损失。我们利用对土壤填充生物测定的时间 X 射线计算机断层扫描 (CT)，旨在量化洞穴网络产生和结构的变化，以此衡量线虫对三种杀虫剂处理过的玉米种子（化合物 X（处于田间试验开发阶段的 R&D 产品）、氟氯氰菊酯和噻虫嗪）的行为变化的反应。此外，还调查了生物杀虫剂替代处理（印楝）、未处理的玉米种子和裸土。还监测了昆虫的健康状况，以提供毒性/死亡率数据。与未经处理的玉米种子和印楝处理相比，暴露于化合物 X 的铁线虫产生了更大的洞穴网，在体积上与裸土中产生的洞穴网相似。与任何其他处理相比，接触 X 化合物还能产生更复杂的洞穴结构，这是形状的顶点、边和面数量（V-E+F）与相互连接的分支数量相关的函数。化合物 X、氟氯氰菊酯和噻虫嗪诱导的死亡率高于印楝或未处理的化合物，这表明这三种化合物都有可能管理线虫种群并减少产量损失，但只有化合物 X 改变了钻蛀行为。由于土壤生物孔在土壤生产力和碳封存方面发挥着重要作用，这种穴居活动的增加对粮食安全和气候变化的广泛影响值得进一步探讨。

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引用次数: 0

Differential effects of urbanization-induced heavy metal pollution on soil microbial communities under evergreen and deciduous trees 城市化引起的重金属污染对常绿树和落叶树下土壤微生物群落的不同影响

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-09-30 DOI: 10.1016/j.pedobi.2024.150999

Hao Hu , Laiye Qu , Siqi Tao , Naili Zhang

Urbanization has significantly increased heavy metal contamination in urban soils, adversely affecting soil microorganisms, which are vital indicators of soil quality. However, the effects of urbanization-induced metal pollution on soil microbial communities remains largely underestimated. This study examines soil microbial communities and properties beneath the canopy of three deciduous and three evergreen trees in urban parks, situated at varying distances from the city center. The results demonstrated that urbanization consistently alters soil physicochemical properties, including pH, soil moisture, and specific heavy metal contents (e.g., Zn, Mn, Cr). The α-diversity of soil bacterial community was significantly influenced by pH and specific heavy metals (e.g., Cr, Cd), whereas the α-diversity of fungal community was affected by pH, independent of heavy metal concentrations. The response of heavy metal content to urbanization exhibited a consistent pattern across both deciduous and evergreen trees, although the effect differed between these tree types. Furthermore, urbanization impacts the diversity, structure, composition and network of soil microbial communities. Notably, the Shannon index of soil fungal communities under deciduous species shows an initial increase, followed by a decline as urbanization intensifies. In contrast, the Simpson index of soil bacteria under evergreen tree species decreases with increased urbanization. Moreover, urbanization alters soil bacterial networks, with higher network density observed in less urbanized areas. It may also affect microbial functions, such as xenobiotic and lipid metabolism. This study provided a theoretical basis for urban park soil management, which is crucial for enhancing urban soil ecosystem services and mitigating the adverse effects of urbanization.

城市化大大加剧了城市土壤中的重金属污染，对作为土壤质量重要指标的土壤微生物产生了不利影响。然而，城市化引起的金属污染对土壤微生物群落的影响在很大程度上仍被低估。本研究考察了城市公园中三棵落叶树和三棵常绿树树冠下的土壤微生物群落和特性，这些树木距离市中心的距离各不相同。结果表明，城市化会持续改变土壤理化性质，包括 pH 值、土壤湿度和特定重金属含量（如锌、锰、铬）。土壤细菌群落的α-多样性受到 pH 值和特定重金属（如铬、镉）的显著影响，而真菌群落的α-多样性则受到 pH 值的影响，与重金属浓度无关。重金属含量对城市化的反应在落叶树和常绿树中表现出一致的模式，尽管这些树种之间的影响有所不同。此外，城市化还会影响土壤微生物群落的多样性、结构、组成和网络。值得注意的是，落叶树种下土壤真菌群落的香农指数显示出最初的上升，随后随着城市化的加剧而下降。相比之下，常绿树种下土壤细菌的辛普森指数则随着城市化的加剧而下降。此外，城市化改变了土壤细菌网络，在城市化程度较低的地区观察到较高的网络密度。城市化还可能影响微生物的功能，如异生物和脂质代谢。这项研究为城市公园土壤管理提供了理论依据，这对提高城市土壤生态系统服务和减轻城市化的不利影响至关重要。

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引用次数: 0

Assessment of microbial diversity in various saline soils driven by salt content 由含盐量驱动的各种盐碱地微生物多样性评估

IF 2 3区农林科学 Q3 ECOLOGY

Pedobiologia

Pub Date : 2024-09-11 DOI: 10.1016/j.pedobi.2024.150997

Dan Liu , Panpan Gao , Jiahe Niu , Zhaoqi Qu , Songnian Guo , Chenxiao Ding , Yanhong Lou , Quangang Yang , Hui Wang , Zhongchen Yang , Hongjie Di , Hong Pan , Yuping Zhuge

The Yellow River Delta, as an important reserve land resource area, faces soil salinization problems. Understanding the bacterial community composition in saline soils is an important foundation for control and utilization of saline soils. However, few studies have been conducted on the composition of bacterial communities in soils with different degrees of salinization. Thus, saline soils categorized into low-salinity (LS), medium-salinity (MS), and high-salinity (HS) based on electrical conductivity (EC) were collected. The 16S rRNA high-throughput sequencing analysis was performed to analyze the effects of salinities on soil bacterial community patterns, as well as the relationships between soil bacterial communities and environmental factors. The results showed that Actinobacteriota, Proteobacteria, Chloroflexi, Firmicutes, Acidobacteriota, Gemmatimonadota and Bacteroidota accounted for almost 90 % of all the bacterial community. The linear discriminant analysis effects (LDA > 3.7) showed that 6, 5 and 3 biomarkers were present in LS, MS and HS soils, respectively, which indicated EC was an important factor influencing the saline soil bacterial community patterns. Redundancy analysis further revealed that the primary environmental parameters impacting the bacterial community were pH, EC, nitrate nitrogen, available phosphorus, total phosphorus, and soil organic matter. According to network analysis, the microbial network complexity was increased steadily with increasing of soil salinity. These findings together revealed that bacterial communities could serve as a reliable way to assess and improve the quality of salinized soils.

黄河三角洲作为重要的后备土地资源区，面临着土壤盐碱化问题。了解盐碱土壤中的细菌群落组成是控制和利用盐碱土壤的重要基础。然而，关于不同盐碱化程度土壤中细菌群落组成的研究却很少。因此，我们收集了根据导电率（EC）分为低盐度（LS）、中盐度（MS）和高盐度（HS）的盐碱土。通过 16S rRNA 高通量测序分析了盐度对土壤细菌群落模式的影响，以及土壤细菌群落与环境因素之间的关系。结果表明，放线菌群、变形菌群、绿僵菌群、腐生菌群、酸性菌群、革囊菌群和类杆菌群占细菌群落总数的近 90%。线性判别分析效应（LDA > 3.7）显示，LS、MS 和 HS 土壤中分别存在 6、5 和 3 个生物标记，这表明 EC 是影响盐碱地细菌群落模式的重要因素。冗余分析进一步表明，影响细菌群落的主要环境参数是 pH 值、EC 值、硝酸盐氮、可利用磷、总磷和土壤有机质。根据网络分析，随着土壤盐度的增加，微生物网络的复杂性也在稳步上升。这些发现共同揭示了细菌群落可以作为评估和改善盐渍化土壤质量的可靠方法。

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引用次数: 0