Agriculture, Ecosystems & Environment最新文献

{"title":"Comparative pollinator conservation potential of coffee agroforestry relative to coffee monoculture and tropical rainforest in the DR Congo","authors":"Jonas Depecker ,&nbsp;Filip Vandelook ,&nbsp;Kurt Jordaens ,&nbsp;Achik Dorchin ,&nbsp;Benjamin Ntumba Katshela ,&nbsp;Ieben Broeckhoven ,&nbsp;Benoit Dhed’a ,&nbsp;Arne Devriese ,&nbsp;Lien Deckers ,&nbsp;Piet Stoffelen ,&nbsp;Olivier Honnay","doi":"10.1016/j.agee.2024.109375","DOIUrl":"10.1016/j.agee.2024.109375","url":null,"abstract":"<div><div>Animal-pollination is crucial in the reproduction of many crops grown in the tropics, including the self-incompatible Robusta coffee. <em>Coffea canephora</em> Pierre ex A. Froehner. is indigenous to the Congo basin where it is naturally growing in the rainforest understorey. Coffee cultivation mainly occurs in either unshaded monocultures or in agroforestry systems. Here we used pan traps to survey the Diptera (true flies) and Hymenoptera (bees) communities as the putative coffee pollinating organisms in the Yangambi region in DR Congo, and we assessed the comparative benefits of a coffee agroforestry system and coffee monoculture to the coffee pollinator community. To assess the pollinator conservation potential of the agroforestry system, we also compared its Diptera and Hymenoptera communities with natural rainforest as a benchmark. Natural rainforest harboured a higher number of individuals, as well as a higher number of species than both agroforestry and coffee monoculture systems, with no differences between the latter two land-uses. Furthermore, we observed different responses in species richness and diversity to land-use between Diptera and Hymenoptera. Our analyses further showed a high species dissimilarity between natural rainforest and the two cultivation systems, without significant differences between the latter. Specifically, the community composition of the agroforestry and coffee monoculture systems were totally different, rather than a subset of the community composition of the natural rainforest. Our study indicates that rehabilitation of agricultural land through intercropping fruit trees may not always enhance pollinator communities and that the studied agroforestry system falls short of matching the bee and fly conservation potential of natural rainforests.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109375"},"PeriodicalIF":6.0,"publicationDate":"2024-11-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662595","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":"Opposite effect on soil organic carbon between grain and non-grain crops: Evidence from Main Grain Land, China","authors":"Shidong Liu ,&nbsp;Li Wang ,&nbsp;Jie Zhang ,&nbsp;Shengping Ding","doi":"10.1016/j.agee.2024.109364","DOIUrl":"10.1016/j.agee.2024.109364","url":null,"abstract":"<div><div>The soil organic carbon (SOC) content of cropland affects global food production and is crucial for agricultural carbon reduction. The SOC response to long-term changes in main grain land (MGL) likely differs from non-MGL cropland. We constructed a quantitative indicator system for the MGL planting pattern to reveal the relationship between MGL use change and SOC. We produced an MGL dataset for China from 1985 to 2020 based on the existing MGL distribution data and available Landsat images and analyzed the heterogeneity of SOC under different MGLs using two SOC datasets. Time series change detection explained the interaction between planting patterns and SOC. Different MGLs exhibited considerable heterogeneity in SOC. The single rice area with the highest SOC was twice (31.62 g/kg) that of the wheat and maize areas. SOC showed an opposite trend in MGL and non-MGL with increased planting intensity. Soil SOC content affected the expansion decisions of farmers in cropland and MGL. Areas with a high SOC were developed into MGL by farmers early. MGL consumed more SOC and had a stronger urgency for fallow cultivation than non-MGL. The planting intensity of MGL more than the inflection threshold (about 15 years) decreased shallow SOC (0–15 cm), decreasing below the initial value after more than 30 years. Currently, 62.08 % of MGL in China causes a decrease in SOC, with an urgent need for a fallow MGL of 27.38 Mha. Theoretical guidance for optimizing crop planting patterns to ensure food security and reduce agricultural carbon emissions was provided.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109364"},"PeriodicalIF":6.0,"publicationDate":"2024-11-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662881","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":"Soil metagenomics reveals reduced tillage improves soil functional profiles of carbon, nitrogen, and phosphorus cycling in bulk and rhizosphere soils","authors":"Xiaojing Hu,&nbsp;Junjie Liu,&nbsp;Aizhen Liang,&nbsp;Haidong Gu,&nbsp;Zhuxiu Liu,&nbsp;Jian Jin,&nbsp;Guanghua Wang","doi":"10.1016/j.agee.2024.109371","DOIUrl":"10.1016/j.agee.2024.109371","url":null,"abstract":"<div><div>Conservation tillage practices (CAT) are known to benefit soil health and soil ecosystem functions relative to conventional tillage (CVT); however, much uncertainty remains concerning microbial functional traits and their subsequent effects on soil nutrients under different tillage practices. We analyzed the functional profiles of the C, N, and P cycles in response to CAT of no-tillage (NT), reduced tillage (RT), and CVT of moldboard plowing (MP) in bulk and rhizosphere soils using shotgun sequencing. CAT induced distinct microbial functional patterns relative to CVT, and these differences were generally more evident in rhizosphere soils than in bulk soils. CAT promotes multiple metabolic pathways such as C and N decomposition, fermentation, CO oxidation, N fixation, nitrate reduction and inorganic-P and organic-P transformations in bulk and/or rhizosphere soils. Variations in these metabolic pathways were mainly driven by <em>Bradyrhizobium</em>, <em>Mesorhizobium</em>, <em>Nitrososphaera</em>, <em>Phenylobacterium</em>, <em>Rhizobium</em> which are affiliated with Proteobacteria, Actinobacteria, Acidobacteria, Bacteroidota and Thaumarchaeota. Furthermore, 24 high-quality metagenome-assembled genomes (MAGs) were reconstructed, of which three novel MAGs (TL100, TL46, and TL57) harbored functional genes regulating all metabolic pathways. In particular, NT-enriched MAGs (such as <em>Sphingomonas</em>) promote fermentation, resulting in the reduction of soil total carbon (TC) relative to MP in bulk soils. RT retained the contents of soil TC and total nitrogen (TN) well and up-regulated the <em>phoR</em> gene carried by <em>Streptomyces</em>, which promoted the regulation of P-starvation concomitantly with the increase in the contents of total phosphorous (TP) and available phosphorous (AP) in bulk soil. Additionally, assimilatory nitrate reduction coupled with organic-P mineralization was facilitated by CAT in rhizosphere soil, leading to the mitigation of N loss and the activation of soil organic-P for crop uptake. Overall, our results revealed that CAT significantly accelerated multiple metabolic potentials, and RT could sustain soil nutrient contents better than NT.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109371"},"PeriodicalIF":6.0,"publicationDate":"2024-11-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662945","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":"Grazing disturbance reduces biocrust-related cyanobacteria and N-fixer abundance but increases bacterial diversity: Implications for biocrust restoration in degraded drylands","authors":"Yue Li ,&nbsp;Yuqi Sun ,&nbsp;Longkat Ayuba Gufwan ,&nbsp;Li Wu ,&nbsp;Shubin Lan","doi":"10.1016/j.agee.2024.109367","DOIUrl":"10.1016/j.agee.2024.109367","url":null,"abstract":"<div><div>Overgrazing is a major driver of dryland degradation, however, so far, there is limited understanding on how this process affects biocrust-related microbial community, and especially how the key groups respond to grazing disturbance. In this study, quantitative polymerase chain reaction (qPCR) and high throughout sequencing technologies were used to investigate the bacterial community abundance and diversity in the Horqin Sandland (China) experiencing different livestock grazing disturbances, in order to examine whether a shift in bacterial community (in particular the key biocrust components, cyanobacteria) was involved, and how this was related to biocrust development and altered soil carbon and nitrogen level. Our results revealed that a clear heterogeneous soil bacterial community was associated with grazing disturbance, which inhibited biocrust development. The decreased photosynthetic cyanobacterial abundance (81.81 % in relative abundance and 98.83 % in absolute abundance) and nitrogen-fixing genes (87.72 %), associated with the lower total carbon and nitrogen content (<em>P</em>&lt;0.05), illustrated a low soil carbon and nitrogen-fixing capability and nutrient level in the grazing-disturbed soils. In particular, a switch of nitrogen-fixing dominance from cyanobacteria to proteobacteria was induced by the grazing disturbance. Compared to the grazing-disturbed soils, higher dominant cyanobacterial operational taxonomic units (OTUs) (especially the species of <em>Nostoc</em> and <em>Scytonema</em>) and lower bacterial diversity (e.g., Shannon, Ace, and Chao index) were observed in the undisturbed biocrust soils, highlighting that the dominants rather than diversity played more important roles in biocrust development. Collectively, our results demonstrate that cyanobacteria are very sensitive (even more than others, e.g., proteobacteria and actinobacteria) to grazing disturbance, therefore, we propose that cyanobacterial inoculation is likely an effective approach to supplement soil cyanobacterial abundance, which is expected to induce biocrust development and increase carbon and nitrogen level in the disturbed drylands.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109367"},"PeriodicalIF":6.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662617","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":"Enhancing soil ecosystem multifunctionality through combined conservation tillage and legume-based crop rotation in the North China Plain","authors":"Wenxuan Liu ,&nbsp;Cong He ,&nbsp;Shouwei Han ,&nbsp;Baijian Lin ,&nbsp;Wensheng Liu ,&nbsp;Yash Pal Dang ,&nbsp;Xin Zhao ,&nbsp;Hailin Zhang","doi":"10.1016/j.agee.2024.109355","DOIUrl":"10.1016/j.agee.2024.109355","url":null,"abstract":"<div><div>Conservation agriculture (CA), based on principles of conservation tillage (CT) and crop rotations, has been adopted as a solution to global climate change. However, interactions between these principles and their cumulative effects on soil functions and crop productivity are not yet fully understood. Herein, a 4-year filed experiment was conducted to assess the impact of CA on soil ecosystem multifunctionality (EMF) in the North China Plain (NCP). The results showed that CA improved EMF by up to 532 % compared to traditional agriculture (rotary tillage under wheat and maize rotation system). This enhancement is mainly driven by a 12.3 % increase in soil organic carbon (SOC) storage, an 8.3 % reduction in soil carbon to nitrogen ratio (C: N), a 68.3 % boost in soil enzyme activities index (SEI), and a 59.7 % increase in available phosphorus (AP) under legume-based crop rotations (LBCR) compared to maize-wheat-maize-wheat (MWMW). The principle of CT improved soil physical structure, enhancing soil aggregate stability by up to 38.1 % compared to rotary tillage (RT). Although, the benefits of CT on crop yield were not always observed, positive interactions on crop yield occurred under LBCR combined with CT. For instance, the soybean-wheat-soybean-wheat (SWSW) rotation produced 40.8 % higher yields than the MWMW rotation under CT. Overall, benefits of CT in improving soil structure, along with the increased diversity crop residues, adjustments in soil nutrient stoichiometric ratios, and enhanced soil enzyme activity under LBCR, led to improved SOC sequestration, crop yield and EMF under CA. The positive interactions between the principles of CA demonstrate its ability to enhance ecosystem multifunctionality. As a result, the combination of CT and LBCR within CA is recommended to sustain the productivity in NCP and other regions with similar conditions.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109355"},"PeriodicalIF":6.0,"publicationDate":"2024-11-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142662933","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 mound building and caching by steppe mouse (Mus spicilegus Petényi) on the vegetation in agroecosystems","authors":"Laura Godó ,&nbsp;Orsolya Valkó ,&nbsp;Sándor Borza ,&nbsp;Attila Ferenc ,&nbsp;Réka Kiss ,&nbsp;Katalin Lukács ,&nbsp;Balázs Deák","doi":"10.1016/j.agee.2024.109359","DOIUrl":"10.1016/j.agee.2024.109359","url":null,"abstract":"<div><div>Several rodent species are considered ecosystem engineers. They exert profound changes in agroecosystems by disturbing the soil during their activities. The steppe mouse (<em>Mus spicilegus</em>) inhabits various agroecosystems and constructs conspicuous mounds for overwintering using piled up plant material and soil. These mounds are widespread in many agroecosystems and may significantly affect the vegetation. In our study, we evaluated the effect of mound building activity of the steppe mouse on the vegetation of agroecosystems in Hungary. We sampled the cache content of 90 mounds in total located in old fields, alfalfa fields, and annual crop fields, and surveyed the aboveground vegetation of the mounds and their surrounding undisturbed matrix in 39 paired plots. Mice cached large amounts of seeds belonging mostly to weeds. In total we found 50,413 germinable seeds of 30 species in the cache content samples. However, the mound vegetation and the cache shared only a few species, suggesting that seeds cached by the mice do not contribute to the regenerating vegetation on the mounds. Soil disturbance by mice created distinct vegetation patches with species composition and structure different from the neighbouring undisturbed matrix. Early secondary successional vegetation patches on mounds introduced small-scale heterogeneity into the homogenous agricultural landscape, increased plant diversity and provided distinct flower resources for pollinators. The detected differences in the aboveground vegetation between the mound and the matrix in the studied habitats suggest that the steppe mouse acts as a facultative engineer species in agroecosystems.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109359"},"PeriodicalIF":6.0,"publicationDate":"2024-11-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593137","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":"Effects of exogenous nitrogen addition on soil organic nitrogen fractions in different fertility soils: Result from a 15N cross-labeling experiment","authors":"Yu Ning ,&nbsp;Shuailin Li ,&nbsp;Chuanchuan Ning ,&nbsp;Jinfeng Ren ,&nbsp;Zhuqing Xia ,&nbsp;Mengmeng Zhu ,&nbsp;Yun Gao ,&nbsp;Xinhui Zhang ,&nbsp;Qiang Ma ,&nbsp;Wantai Yu","doi":"10.1016/j.agee.2024.109366","DOIUrl":"10.1016/j.agee.2024.109366","url":null,"abstract":"<div><div>Exogenous nitrogen (N) addition serves as a pivotal nutrient management strategy, significantly enhancing agricultural production by regulating soil N availability and retention. However, the dynamics of soil organic nitrogen (SON) fractions in response to various forms of exogenous N addition across differing soil fertility levels remain inadequately understood. This study utilized data from a 25-year fertilization experiment and a ¹⁵N cross-labeling experiment in Northeast China to assess and quantify the effects of mineral N fertilizers and organic materials (manure and straw) on SON fractions in NPK (mineral fertilizer addition) and NPKM (NPK combined with composted pig manure) treatments. Our findings indicate that long-term incorporation of manure substantially elevates soil fertility compared to the exclusive use of mineral fertilizers. Notably, exogenous N primarily boosts soil N availability by enhancing acid-soluble organic N fractions, particularly ammonium nitrogen (AN) and amino acid nitrogen (AAN). Organic materials, particularly straw, significantly enhanced the retention of mineral fertilizer N in both NPK and NPKM treatments (9.54 % vs 10.70 %). Moreover, over 70 % of the N from straw or manure remained in the soil as stable SON fractions. While straw rapidly improves low-fertility soils, manure contributes to enhanced soil N reserves and increased crop yields. Therefore, incorporating organic matter may bolster soil N sequestration in Northeast China, which is contingent upon soil fertility and tailored fertilizer management strategies. This research elucidates the distribution and conversion of exogenous N within SON pools, facilitating optimized N management, sustaining yields, reducing farmland N pollution, and promoting agricultural sustainability.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109366"},"PeriodicalIF":6.0,"publicationDate":"2024-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142593136","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":"Functional groups of leaf phenology are key to build climate-resilience in cocoa agroforestry systems","authors":"Issaka Abdulai ,&nbsp;Munir Hoffmann ,&nbsp;Helena Kahiluoto ,&nbsp;Michaela A. Dippold ,&nbsp;Mutez A. Ahmed ,&nbsp;Richard Asare ,&nbsp;Winston Asante ,&nbsp;Reimund P. Rötter","doi":"10.1016/j.agee.2024.109363","DOIUrl":"10.1016/j.agee.2024.109363","url":null,"abstract":"<div><div>Agroforestry has the potential to enhance climate change adaptation. While benefits from agroforestry systems consisting of cash crops and shade trees are usually attributed to the (shade) trees, the trees can also have negative impacts due to resource competition with crops. Our hypothesis is that leaf phenology and height of shade trees determine their seasonal effect on crops. We test this hypothesis by categorizing shade tree species into functional groups based on leaf phenology, shade tree canopy height and shade tree light (wet and dry season) interception as well as the effects. To this end, leaf phenology and the effects on microclimate (temperature, air humidity, intercepted photoactive radiation (PAR)), soil water, stomatal conductance and cocoa yield were monitored monthly during wet and dry seasons over a two-year period on smallholder cocoa plantations in the northern cocoa belt of Ghana. Seven leaf phenological groups were identified. In the wet season, highest buffering effect of microclimate was recorded under the trees brevi-deciduous before dry season. During dry season, high PAR and lowest reduction in soil moisture were observed under the trees in the group of completely deciduous during dry season. The evergreen groups also showed less reduction in soil water than the brevi-deciduous groups. In the wet season, shade tree effects on cocoa tree yields in their sub canopy compared to the respective control of outer canopy with full sun ranged from positive (+10 %) to negative (-15 %) for the deciduous groups, while yield reductions for the evergreen groups ranged from −20 % to −33 %. While there were negative yield impacts for all phenological groups in the dry season, the trees in completely deciduous during dry season group recorded least penalties (-12 %) and the trees with evergreen upper canopy the highest (-35 %). The function of shade trees in enhancing climate resilience is therefore strongly dependent on their leaf phenological characteristics. Our study demonstrates how the key trait leaf phenology can be applied to successful design of climate-resilient agroforestry systems.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109363"},"PeriodicalIF":6.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578390","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":"Nutrient enrichment weakens community temporal stability via asynchrony and species dominance in a subalpine grassland","authors":"Xiaoling Gan ,&nbsp;Weibin Li ,&nbsp;Xiaoshuang Ye ,&nbsp;Yuan Jiang ,&nbsp;Chuanyan Zhao","doi":"10.1016/j.agee.2024.109358","DOIUrl":"10.1016/j.agee.2024.109358","url":null,"abstract":"<div><div>Rapid and frequent nitrogen (N) and phosphorus (P) inputs have seriously disrupted the stability of many ecosystems, prompting us to find the main mechanisms driving these changes across various ecological systems, which is crucial for predicting ecosystem responses to reactive nutrient inputs. While the mechanisms underlying N-induced stability have been extensively studied, the effects of P and simultaneous N and P enrichment on ecological stability and their driving mechanisms are less understood, particularly in alpine ecosystems. To address this gap, we conducted a short-term (2019–2023) simulation experiment of N and P enrichment in a subalpine grassland of Qilian Mountain to evaluate the effects of nutrient enrichment on ecosystem stability and to identify its potential mechanisms. Our findings demonstrated that five-year nutrient enrichment did not obviously affect species richness/dominance, but N+P enrichment significantly decreased both community aboveground biomass (AGB) and the AGB of dominant species. In addition, community temporal stability was strongly reduced with both N and N+P enrichment. This negative impact was directly driven by the stability of dominant species, species dominance, and compensatory effects, which together explained 77 % of the variation in stability according to structural equation modeling (SEM). Moreover, species richness indirectly influenced community stability through species asynchrony. Our findings provide a theoretical basis for understanding the roles of compensatory effects and dominant species in driving changes in ecosystem stability under nutrient enrichment.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109358"},"PeriodicalIF":6.0,"publicationDate":"2024-11-04","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142578389","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":"Response of grassland greenhouse gas emissions to different human disturbances – A global Meta-analysis","authors":"Yong Cao ,&nbsp;Zemin Ai ,&nbsp;Xiaohu Dang ,&nbsp;Huan Liu ,&nbsp;Qingqing Li ,&nbsp;Mengjia Hou ,&nbsp;Yuyan Yao ,&nbsp;Yi Deng ,&nbsp;Lie Xiao ,&nbsp;Shuaimeng Zhu","doi":"10.1016/j.agee.2024.109362","DOIUrl":"10.1016/j.agee.2024.109362","url":null,"abstract":"<div><div>Human disturbances have increased greenhouse gas (GHG) emissions from grassland, worsening global warming. However, the response of grassland GHG (CO₂, N₂O, and CH₄) to human disturbances across various climatic zones requires further elucidation, as does the intricate relationship between GHG emissions and temperature and precipitation. A Meta-analysis of the effects of human disturbances on GHG in grassland over the past 40 years revealed that grazing, fertilization, mowing, and burning significantly influenced the total emissions of N₂O, CH₄, CO₂, and GHG from grassland. However, the light and moderate grazing exerted no substantial impact on CO₂ emission flux. In frigid zone grassland, the N₂O emission flux was most significantly affected by grazing, the CH₄ emission flux affected by fertilization was higher than grazing, and the CO₂ emission flux was more sensitive to heavy grazing than severe fertilization. In temperate grassland and savanna, GHG emission flux was most sensitive to fertilization, with CO₂ emission flux in savanna being particularly responsive to burning. The effect of increased temperature and precipitation on CO_2e in fertilized grassland was approximately double that of grazed grassland and quadruple that of mowed grassland. This study emphasizes the increased effect of human disturbances on GHG emissions in the grassland, especially with the most significant impact of fertilization disturbances on GHG emissions in most grassland areas. Lowering the level of fertilization during grassland management could serve as a crucial step in mitigating GHG emissions from grassland. In summary, rigorous control of disturbance intensity represented an effective strategy for mitigating greenhouse gas emissions, albeit potentially impacting grassland productivity. Future endeavors should focus on determining the optimal disturbance intensity to strike a balance amidst these complex effects.</div></div>","PeriodicalId":7512,"journal":{"name":"Agriculture, Ecosystems & Environment","volume":"379 ","pages":"Article 109362"},"PeriodicalIF":6.0,"publicationDate":"2024-11-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142571289","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}