Agriculture, Ecosystems & Environment最新文献

{"title":"Corrigendum to Grazing legacy mediates the diverse responses of grassland multidimensional stability to resource enrichment [Agric. Ecosyst. Environ. 378 (2025) 109313]","authors":"Fengwei Xu , Jianjun Li , Liji Wu , Biao Zhu , Dima Chen , Yongfei Bai","doi":"10.1016/j.agee.2024.109457","DOIUrl":"10.1016/j.agee.2024.109457","url":null,"abstract":"","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109457"},"PeriodicalIF":6.0,"publicationDate":"2024-12-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141936","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}

{"title":"Long-term impact of silviculture systems on phosphorus transformation and adsorption behaviour in semi-arid restored lands","authors":"Jyotirmay Roy ,&nbsp;Dipak Ranjan Biswas ,&nbsp;Biraj Bandhu Basak ,&nbsp;Ranjan Bhattacharyya ,&nbsp;Shrila Das ,&nbsp;Sunanda Biswas ,&nbsp;Anchal Dass ,&nbsp;Tirunagari Rupesh ,&nbsp;Amit Kumar Singh ,&nbsp;Avijit Ghosh","doi":"10.1016/j.agee.2024.109449","DOIUrl":"10.1016/j.agee.2024.109449","url":null,"abstract":"<div><div>Phosphorus (P) is a key nutrient in silvicultural ecosystems, where its cycling influences both primary productivity and ecosystem development. Different trees affect P availability in distinct ways. Analyzing impact of various trees on soil P fractions and the its adsorption-desorption behavior helps better understand soil P availability in these ecosystems. Therefore, this study aims to investigate the impact of silviculture systems (SCSs) on depth distribution of P fractions, the P adsorption-desorption pattern, and P availability in eco-restored land. Three distinct silviculture systems, namely <em>Leucaena leucocephala</em> (LL), <em>Hardwickia binata</em> (HB), and <em>Azadirachta indica</em> (AI) SCSs were compared with degraded fallow (F) to assess their influence on soil properties and P dynamics in a Typic Haplustepts of semi-arid ecosystem. Soil samples were collected from three different depths 0–15 cm, 15–30 cm, and 30–45 cm of these SCSs. The LL, HB and AI showed 2.50, 2.01 and 1.39 times increase in available P over fallow, respectively. Microbial biomass phosphorus (MBP) content increased in LL by 99, 97, and 53 % at 0–15, 15–30, and 30–45 cm, respectively, over fallow. For acid phosphatase activity, LL, HB, and AI exhibited 3.15, 2.43, and 1.56 folds increase over fallow. The distribution of different phosphorus fractions followed the order: Fe-P (39.9–36.7 %)&gt; Organic P (25.7–24.4 %) &gt; Al-P (24.8–19.1 %)&gt; Ca-P (8.64–4.05 %)&gt; Res-P (8.61–7.37 %)&gt; Saloid P (0.63–0.50 %). Additionally, P adsorption-desorption revealed that SCSs could lower the adsorption capacity and P desorption than fallow. Thus, different silviculture systems exhibit the potential to enhance the P-supplying capacity of soil and restore degraded soils in semi-arid regions.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109449"},"PeriodicalIF":6.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141857","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}

{"title":"Understanding the increased maize productivity of intercropping systems from interactive scenarios of plant roots and arbuscular mycorrhizal fungi","authors":"Yizhe Wang ,&nbsp;Pan Jiang ,&nbsp;Chaolin Liao ,&nbsp;Jiangchi Fei ,&nbsp;Yuping Zhang ,&nbsp;Rong Xiangmin ,&nbsp;Jianwei Peng ,&nbsp;Gongwen Luo","doi":"10.1016/j.agee.2024.109450","DOIUrl":"10.1016/j.agee.2024.109450","url":null,"abstract":"<div><div>Abundant evidences have demonstrated that below-ground feedback mediated by crop diversification is essential for enhancing crop productivity. However, there is a knowledge gap about the mechanism underlying intercropping-driven productivity gain from the perspective of interactive scenarios of root traits and arbuscular mycorrhizal fungi (AMF). Herein, a ten-year field experiment was employed to reveal the differences of rhizosphere AMF community and root functional traits between maize monocropping and intercropping systems (maize-peanut, maize-soybean, maize-gingelly, and maize-sweet potato), as well as their relationships with maize productivity. AMF community traits were identified by high-throughput sequencing combined with bioinformatics and ecological analysis. Plant biomass, carbon (C) and nutrient content and accumulation were considered as productivity indicators, and root activity and morphology were considered as root functional traits. Compared with monocropping system, intercropping systems showed higher maize biomass, C accumulation and nutrient uptake (P &lt; 0.05), and the intercropping advantage varied at different growth stages. Monocropping and intercropping systems showed a significant difference in maize root activity and morphology. AMF colonization significantly increased in all systems as maize developed, with the maize-peanut and maize-soybean consistently keeping higher colonization than other systems. The AMF communities of all systems except maize-gingelly were with greater force governed by deterministic assembly processes (MST &lt; 50 %), in which monocropping system presented the lowest stochasticity ratio. AMF community composition in maize-soybean system was most deterministically driven and most diffusion-limited in neutral model. Compared with monocropping system, AMF community network showed a higher robustness in intercropping systems. And the ASVs of AMF community enriched by intercropping systems mainly belonged to genus <em>Paraglomus</em>, <em>Glomus</em>, and <em>Claroideoglomus</em>. The colonization, Shannon index, community composition, and core taxa (<em>Glomus</em>) of rhizosphere AMF influenced plant biomass and C and nutrient accumulation directly or indirectly by regulating root activity and morphology. Root activity also affected these maize productivity indicators directly or indirectly by regulating AMF community composition and core taxa (<em>Claroideoglomus</em> and <em>Paraglomus</em>). This work highlights the benefits of rhizosphere AMF in productivity gain of intercropping systems, and meanwhile, underscores the importance of AMF and root interactions in crop production.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109450"},"PeriodicalIF":6.0,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142035","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}

{"title":"Intensification of land use in Neotropical environments determines loss of taxonomic and functional diversity of spiders","authors":"Bárbara de Albuquerque Pereira ,&nbsp;Cristiano Ilha ,&nbsp;Márcio Gonçalves da Rosa ,&nbsp;Antônio Domingos Brescovit ,&nbsp;Pâmela Niederauer Pompeo ,&nbsp;Luís Carlos Iuñes de Oliveira Filho ,&nbsp;Dilmar Baretta ,&nbsp;Renan de Souza Rezende ,&nbsp;Carolina Riviera Duarte Maluche Baretta","doi":"10.1016/j.agee.2024.109447","DOIUrl":"10.1016/j.agee.2024.109447","url":null,"abstract":"<div><div>The structure and complexity of landscapes can significantly impact the composition and functional traits of spiders, given their strong response to environmental changes. Understanding these effects helps to assess the impact of agricultural practices on spider communities. Our study aimed to evaluate the influence of land use and management systems on taxonomic and functional diversity, as well as changes in spider functional traits. Conducted in the eastern and western regions of Santa Catarina State, Brazil, the study focused on land use systems (LUS), including native forest (NF), eucalyptus reforestation (ER), pasture (PA), crop-livestock integration (CLI), and no-tillage (NT). The sampling of the eastern region occurred between July, August and December 2011 and January 2012 and in the western region occurred in April, August 2018. Each collection site represented a sampling station with up to 1 km distance between stations, totaling 888 sampling points. Two collection methods were employed: Tropical Soil Biology and Fertility (TSBF) and pitfall traps. Spider functional diversity was assessed based on eight functional traits. Taxonomic diversity was evaluated through richness, and indices such as FRic, FEve, FDis, FDiv, and CWM were calculated. Generalized linear models (GLMM) were applied to compare the indices. The highest functional and taxonomic richness of spiders was found in native forest (NF). Functional traits, particularly dispersal capacity and stratum preference, showed significant variation across land use systems (LUS), with CLI and PA exhibiting the greatest impacts on functional diversity. The intensity of management practices appears to favor generalist species that are more just more plastic, tolerant and/or dispersive to environmental changes, which could lead to functional biotic homogenization.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109447"},"PeriodicalIF":6.0,"publicationDate":"2024-12-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142758","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}

{"title":"Long term intercropping promotes improvement of soil quality and alleviates faba bean wilt disease","authors":"Jing Zhang ,&nbsp;Bijie Hu ,&nbsp;Yiran Zheng,&nbsp;Zhengyu Zhang,&nbsp;Binzhi Wang,&nbsp;Kun Dong,&nbsp;Yan Dong","doi":"10.1016/j.agee.2024.109443","DOIUrl":"10.1016/j.agee.2024.109443","url":null,"abstract":"<div><h3>Background</h3><div>Intercropping is vital for enhancing soil quality improvement and improving ecological services.</div></div><div><h3>Objective</h3><div>This study integrated the analysis of rhizosphere metabolites and microbial communities to elucidate the mechanism by which the long-term intercropping could regulate the soil rhizosphere microecology and promote the faba bean growth.</div></div><div><h3>Method</h3><div>Two planting modes, faba bean single cropping and faba bean-wheat intercropping, along with the planting durations of 1 and 9 years, were established to investigate the wilt disease occurrence. The growth indicators, the soil physical and chemical properties, the rhizosphere microbial communities, and the changes in rhizosphere metabolites of faba bean were measured.</div></div><div><h3>Results</h3><div>Continuous cropping can lead to poor soil conditions and high incidence of faba bean disease, while intercropping can alleviate the occurrence of diseases. Compared with monoculture for 1 year, monoculture for 9 year can promote the growth of faba bean by 12.89–29.19 %, reduce the incidence rate of fusarium wilt by 41.38 %, increase the proportion of large aggregates with R&gt; 0.25 mm by 18.87 % by reducing the soil bulk density by 6.67 %, average weight diameter 23.16 %, geometric mean diameter 26.51 %, maintaining soil pH stability and increasing soil organic matter by 30.74 % can improve soil structure, and the disease control effect is more significant. It is also possible to reduce the relative abundance of Fusarium by 8.93 % by improving the soil microbial community structure. In addition, metabolomics analysis also showed that long-term intercropping promotes the secretion of flavonoids and terpenoids in the rhizosphere soil of faba bean, enhancing their resistance. Through correlation analysis, it was found that soil microbial activity is closely related to key metabolites in crop rhizosphere. The secretion and synthesis of flavonoids and terpenes can reduce the abundance of faba bean pathogens and alleviate their disease occurrence.</div></div><div><h3>Conclusion</h3><div>The faba bean-wheat long-term intercropping improved the soil physical and chemical properties, reconstructed the microbial community structure, and reduced the pathogenic bacteria abundance through rhizosphere metabolites, thereby maintaining soil quality improvement and promoting healthy faba bean growth.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109443"},"PeriodicalIF":6.0,"publicationDate":"2024-12-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142757","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}

{"title":"Effects of carbon sources on soil bacterial community dynamics during anaerobic soil disinfestation in an organic tomato production system","authors":"Joe G. Ono-Raphel ,&nbsp;Gordon F. Custer ,&nbsp;Kathleen Arrington ,&nbsp;Ben Morrison ,&nbsp;Jason Kaye ,&nbsp;Erin Rosskopf ,&nbsp;Francisco Dini-Andreote ,&nbsp;Francesco Di Gioia","doi":"10.1016/j.agee.2024.109448","DOIUrl":"10.1016/j.agee.2024.109448","url":null,"abstract":"<div><div>Anaerobic soil disinfestation (ASD) is a biologically-based agricultural practice used to manage soilborne pests and pathogens and enhance soil fertility. Successful implementation of ASD requires the use of distinct soil organic amendments as a source of carbon (C) and nitrogen (N), which dynamically affect the microbial-mediated processes of organic C breakdown and stabilization. Here, we established a field experiment to test the effects of different soil organic amendments – including cover crops characterized by different C:N ratios and an agricultural by-product (i.e., wheat middlings) – on the temporal dynamics of soil bacterial communities and their implications for ASD efficacy and subsequent tomato crop performance. We used a combination of time-series analyses to investigate variation in the soil bacterial community and soil chemical properties (e.g., pH, electrical conductivity (EC), cumulative redox potential (ΣEh), ammonium, and nitrate content) over 21 days of ASD treatment and following tomato planting. Our results revealed that the organic amendments used to apply ASD caused a shift in soil bacterial communities driven primarily by changes in pH and EC. However, post-tomato planting, soil bacterial communities exhibited resilience to ASD treatment and were compositionally similar to the pre-ASD bacterial communities. Beneficial taxa were differentially enriched during ASD treatment and the tomato crop cycle. Taxa enriched during ASD treatment included <em>Candidatus</em> Udaeobacter<em>, Gaiella, Pseudomonas, Rhizobium, Klebsiella, Paenibacillus,</em> and <em>Bacillus</em>. Likewise, taxa enriched during tomato production included <em>Nitrospira, Geobacter,</em> and <em>Haliangium.</em> Additionally, the amendment with wheat middlings caused faster shifts in soil bacterial communities 2 days after the ASD treatment, while crimson clover residues were associated with greater tomato crop yield by increasing soil ammonium and nitrate contents. Collectively, this study demonstrates that ASD application using C sources with C:N ratios &lt; 20:1 and rapid decomposability effectively improves soil nutrient status and crop performance.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109448"},"PeriodicalIF":6.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142755","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}

{"title":"Impacts of agricultural intensification and abandonment on plant and pollinator diversity, their mutualistic networks, and pollination services","authors":"Gaku S. Hirayama ,&nbsp;Masayuki Tomita,&nbsp;Atushi Ushimaru","doi":"10.1016/j.agee.2024.109437","DOIUrl":"10.1016/j.agee.2024.109437","url":null,"abstract":"<div><div>Land intensification and abandonment are major threats to biodiversity declines in agricultural landscapes. Biodiversity declines lead to degradation of ecosystem services by altering species interaction networks. However, we still know little about the ecological processes how biodiversity declines affect ecosystem services via species interaction networks in changing agricultural landscapes. Here, we investigated 19 meadows around paddy terraces with different land-use types (traditional, intensified, and abandoned terraces). We compared plant and pollinator diversity, network structure of plant-pollinator interactions, and pollination success of native and exotic plants between traditional and intensified and abandoned meadows. In the analyses, we divided plants and pollinators into life history and origin groups (native perennial, native annual, and exotic plants) and taxonomic groups (bees, syrphid and other flies, and butterflies), respectively. Intensified meadows had significantly lower native and higher exotic plant diversity than traditional meadows, whereas abandoned meadows had much lower native plant diversity. Pollinator diversity, particularly those of bees and syrphids, were significantly lower in intensified meadows, and those of all taxonomic groups were much lower in abandoned meadows. Significantly lower pollination services were observed for native perennials via network generalization, while higher services for exotic plants were found in both intensified and abandoned meadows, compared to traditional meadows. Moreover, the type of generalization varied between intensified and abandoned networks, likely due to the differences in mechanisms of diversity loss between them. Overall, our findings suggest that both land intensification and abandonment lead to the degradation of native pollination services, despite being distinct mechanisms. We recommend re-introduction of traditional extensive managements and removal of exotic plants in intensified and abandoned meadows to restore native paddy biodiversity and ecosystem services.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109437"},"PeriodicalIF":6.0,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141906","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}

{"title":"Cover crop biomass production as a predictor of nitrogen fertilizer replacement value - legumes secure positive effects","authors":"Chiara De Notaris ,&nbsp;Leanne Peixoto ,&nbsp;Esben Ø. Mortensen ,&nbsp;Jim Rasmussen","doi":"10.1016/j.agee.2024.109446","DOIUrl":"10.1016/j.agee.2024.109446","url":null,"abstract":"<div><div>Cover crops can contribute to climate change mitigation by promoting soil organic carbon sequestration, retaining nitrogen (N) in soil and lower greenhouse gas emissions from reduced fertilization of following crops. Their N fertilizer replacement value (NFRV) varies based on cover crop type and management. This study aimed at identifying factors affecting cover crop NFRV as a means to guide N fertilizers reduction. Ryegrass (<em>Lolium perenne</em> L.; RG), plantain (<em>Plantago lanceolata</em> L.; PL), red clover (<em>Trifolium pratense</em> L.; RC), and two mixtures (RG+PL and RG+PL+RC) were sown in May 2020 and 2021 in an organic field trial, and terminated by either rotovation+ploughing or ploughing. Spring barley (<em>Hordeum vulgaris</em> L.) was used as a test crop to quantify NFRV. Before sowing spring barley, cover crop plots were not fertilized and control plots received 0, 50 and 100 kg mineral N ha⁻¹. In both years, RG+PL+RC had the greatest aboveground biomass and biomass N yield in autumn (5.5 Mg ha⁻¹, 128 kg N ha⁻¹), while RG had the lowest (0.7 Mg ha⁻¹, 21 kg N ha⁻¹). Before termination in spring, differences among cover crop types were less pronounced with no effect of termination method on NFRV. However, the NFRV was significantly correlated to cover crop biomass (p &lt; 0.001) in autumn (r = 0.83) and spring (r = 0.66). NFRV was as high as 100 kg N ha⁻¹ with RC and RG+PL+RC, while negative values were obtained with autumn biomass below 1 Mg ha⁻¹. We found a strong correlation between cover crop biomass and NFRV, which can guide N fertilization reduction if autumn cover crop biomass can be estimated. The threshold between positive and negative residual N effects at 1 Mg ha⁻¹ confirms the need for a minimum cover crop biomass for providing desired ecosystem services.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109446"},"PeriodicalIF":6.0,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143142756","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}

{"title":"Fencing reshapes spatial patterns of nutrient pools during peak-growing-season in the Tibetan grasslands: Spatial heterogeneity of C and N pools and elevational homogeneity of P pools","authors":"Yong Qin ,&nbsp;Xianzhou Zhang ,&nbsp;Gang Fu","doi":"10.1016/j.agee.2024.109442","DOIUrl":"10.1016/j.agee.2024.109442","url":null,"abstract":"<div><div>Fencing can play an important role in the protection of carbon (C), nitrogen (N) and phosphorus (P) pools in grassland ecosystems. However, these effects on a wide range of climatic and geographic scales remain unclear. This study investigated 37 pairs of fencing and grazing sample sites in alpine grasslands across an 1800-km transect on the Tibetan Plateau to evaluate the effects of fencing on C, N, and P pools of aboveground plants, roots, soil and the entire ecosystem. Fencing increased the space average values of C, N and P pools of aboveground plants and roots by 11.07 %–38.33 % and the soil C pools by 11.05 % at 0–10 cm. Compared with 0–10 and 20–30 cm, the spatial average values of belowground roots C, N, and P pools at 10–20 cm were more sensitive to fencing. The effects of fencing on C, N and P pools of aboveground plants in alpine deserts were higher than those in alpine meadows and alpine steppes. Fencing heterogenized the spatial patterns of C and N pools of the ecosystem while homogenized the elevational pattern of the P pool. With increasing longitude, the responses of C, N, and P pools of the ecosystem to fencing were enhanced. Conversely, with increasing latitude and elevation, the effects of fencing on C, N, and P pools decreased. Therefore, the effects of fencing on the C, N, and P pools of the alpine grasslands were related to soil depth and grassland type. The sensitivities of nutrient pools of aboveground plants, roots and soil to fencing were different. Ecosystem P pool homogenization caused by fencing potentially disrupted phosphorus flow and ecological processes, and thus weakened ecosystem functionality. The effects of fencing on ecosystem nutrient pools were not always positive, which suggested that fencing should not be everywhere, at least for the restoration of C, N, and P pools.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109442"},"PeriodicalIF":6.0,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141907","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}

{"title":"Ecosystem-scale crassulacean acid metabolism (CAM) gas exchange of a sisal (Agave sisalana) plantation","authors":"Mikko Skogberg ,&nbsp;Kukka-Maria Kohonen ,&nbsp;Annalea Lohila ,&nbsp;Lutz Merbold ,&nbsp;Matti Räsänen ,&nbsp;Ilja Vuorinne ,&nbsp;Petri Pellikka ,&nbsp;Timo Vesala ,&nbsp;Angelika Kübert","doi":"10.1016/j.agee.2024.109435","DOIUrl":"10.1016/j.agee.2024.109435","url":null,"abstract":"<div><div>Plants using crassulacean acid metabolism (CAM) for photosynthesis are particularly adapted to dry conditions, as they can focus on night-time carbon uptake and still exhibit considerable productivity. However, gas exchange measurements of CAM plants at the ecosystem level are scarce. Only a few studies to date report on the carbon dioxide (CO₂) exchange of CAM plants using the eddy covariance (EC) method. We monitored the ecosystem CO₂ exchange of an <em>Agave sisalana</em> plantation using the EC method in semi-arid Kenya. Measurements lasted 65 days and began during a wet period that gradually transitioned to a dry period. High productivity periods of <em>A. sisalana</em> occurred during the initial wet period with a mean CO₂ uptake of −1.1 µmol m⁻² s⁻¹ (dry period: +0.3 µmol m⁻² s⁻¹). High productivity was related to significant day- and nighttime carbon uptake, indicating direct CO₂ fixation via the C3 pathway during daytime. With decreasing soil moisture, mean daytime net CO₂ exchange became a notable carbon source (from +1.0 to +4.0 µmol m⁻² s⁻¹), suggesting a shift of <em>A. sisalana</em> towards strict CAM photosynthesis in response to soil drying. Our results demonstrate <em>A. sisalana</em>’s high photosynthetic plasticity in relation to soil moisture dynamics and its significance for ecosystem-scale CO₂ fluxes.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"381 ","pages":"Article 109435"},"PeriodicalIF":6.0,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143141905","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}