Applied Soil Ecology最新文献

{"title":"Organic management promotes nitrogen transformation in tea plantations soil: A case study from southwestern China","authors":"Xinhui Huang ,&nbsp;Biao Wang ,&nbsp;Panfeng Li ,&nbsp;Anqiang Chen ,&nbsp;Jixiao Cui ,&nbsp;Yuanquan Chen ,&nbsp;Wangsheng Gao","doi":"10.1016/j.apsoil.2025.105878","DOIUrl":"10.1016/j.apsoil.2025.105878","url":null,"abstract":"<div><div>The insufficient soil nitrogen supply and its transformation mechanisms, along with the impact of organic management at various growth stages of tea plants on soil nitrogen cycling in organic tea plantations, are poorly understood. To elucidate the nitrogen transformation mechanism and enhance agronomic practices in organic tea plantations, we investigated the soil nitrogen-cycling microbiome and nitrogen cycling abundance (reflecting nitrogen transformation potential) in tea plantations aged 11, 16, and 24 years under both organic management (OM) and conventional management (CM). Specifically, OM11, OM16, and OM24 represent plantations that transitioned to organic management during the cultivating period (seedling stage), at 2 years old (juvenile stage), and at 10 years old (adult stage), respectively. The results demonstrated that the nitrogen transformation potential was enhanced by 28 % and 37 % in OM16 and OM24 compared to CM, respectively. In OM16, the abundance of <em>nirD</em> in dissimilatory nitrate reduction (DNRD) reduced by 53 %, while genes involved in assimilatory nitrate reduction (ANRD), DNRD, denitrification, nitrate assimilation, methylaspartate cycle, and nitrogen fixation had an increase of 24 %–2900 % compared to CM16. Meanwhile, in OM24, genes involved in DNRD, denitrification, nitrate assimilation, nitrification, and methylaspartate cycle exhibited a 50 %–1200 % increase over CM24. Microorganisms involved in soil nitrogen cycling were similar between OM and CM, while their abundance varied significantly. The pH and <em>Betaproteobacteria</em> were the key factors influencing nitrogen transformation. In summary, these results underscored the positive effect of long-term organic management on the nitrogen transformation in the tea plantation soil, and it exhibited a significant promoting effect when organic management was initiated at 2 years old (juvenile stage) and 10 years old (adult stage).</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105878"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143132038","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Prairie strips quickly alter soil bacterial and fungal communities in strips, but not in surrounding cropland","authors":"Corinn E. Rutkoski ,&nbsp;Sarah E. Evans","doi":"10.1016/j.apsoil.2024.105842","DOIUrl":"10.1016/j.apsoil.2024.105842","url":null,"abstract":"<div><div>The conversion of tallgrass prairie to row crop agriculture in the U.S. Midwest has reduced soil biodiversity and ecosystem functions. Prairie strips are zones of perennial vegetation integrated into row crop farm fields that increase native plant, insect, and wildlife diversity in agricultural landscapes, and may also enrich belowground diversity of soil bacteria and fungi. Within a 35 year old cropping system experiment, we introduced prairie strips in two treatments - one with reduced chemical inputs and one with no chemical inputs – and we measured soil microbial communities every year for the first four years of prairie strip establishment, hypothesizing that communities would shift in soils under prairies, and subsequent dispersal from prairie communities would alter composition in surrounding cropland. We assessed alpha diversity, beta diversity, and relative abundance of prairie-associated microbial phyla in prairie strip soils and in cropland soils at multiple distances from prairie strips. We found that as early as two months after planting, prairie strip bacterial and fungal communities diverged from cropland community composition, exhibited higher diversity than cropland, and were enriched in microbial phyla characteristic of remnant tallgrass prairie soils. Prairie strips harbored different communities in the two cropping systems, indicating that land use history shapes communities early in prairie strip establishment. Microbial communities in surrounding croplands were not altered by the presence of prairie strips, neither on average nor as a function of distance. We show that prairie strips restore tallgrass prairie soil biota in multiple cropping systems, but prairie taxa are not likely to spill over into low intensity cropland soils due to cropland management practices that inhibit microbial dispersal and establishment.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105842"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143132191","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Earthworm and enchytraeid indicator taxa of different land-use types identified using soil DNA metabarcoding","authors":"Jessica Cuartero ,&nbsp;Maria J.I. Briones ,&nbsp;Basil M. Rast ,&nbsp;Beat Stierli ,&nbsp;Claudia Maurer-Troxler ,&nbsp;Anna-Sofia Hug ,&nbsp;Franco Widmer ,&nbsp;Jiří Schlaghamerský ,&nbsp;Beat Frey","doi":"10.1016/j.apsoil.2025.105891","DOIUrl":"10.1016/j.apsoil.2025.105891","url":null,"abstract":"<div><div>Earthworms and enchytraeids play an important role in biogeochemical cycles and are good indicators of soil fertility. However, assessing their assemblages is difficult, mainly because the methods to identify them require expert knowledge, which becomes a technical challenge when surveying large areas. Soil DNA metabarcoding is a promising method that enables the identification of individual species directly from a bulk composite sample in large field experiments. Here, we investigated in parallel both earthworm (family Lumbricidae) and enchytraeid (family Enchytraeidae) assemblages in three land-use types (arable land, grassland, forest) across 29 Swiss Soil Monitoring Network (NABO) sites, using high-throughput amplicon sequencing of marker genes. For both earthworms and enchytraeids, α-diversity was higher in grasslands than in arable land and forests, and it was significantly affected by soil physico-chemical, climate and biological properties, especially pH and climate properties. In addition, we found negative correlations between earthworms α-diversity and soil total carbon (TC) content and the soil carbon to nitrogen ratio. Using the DNA metabarcoding, we observed sequences of <em>Aporrectodea nocturna</em> in soils with low pH, while other <em>Aporrectodea</em> species occurred in soils with high pH. We identified <em>Bimastos rubidus</em> in soils with low pH but higher TC, total nitrogen, organic C, and low silt content, while the enchytraeids <em>Cognettia sphagnetorum</em> and <em>Cernosvitoviella atrata</em> occurred in forest soils with high water and organic matter contents. We identified some indicator taxa for the different land-use types, for grassland: <em>Aporrectodea icterica</em>, <em>Lumbricus rubellus</em>, <em>Marionina communis</em>, <em>Fridericia bisetosa</em> and <em>Fridericia connata</em>; arable land: <em>Allolobophora chlorotica</em>, <em>Enchytraeus dichaetus</em>, <em>Achaeta iberica</em>, <em>Prodtodrilus antipae</em> and <em>Fridericia tuberosa</em>; and for forest: <em>Octolasion cyaneum</em>, <em>Octolasion lacteum</em> and <em>Cognettia chlorophila</em>. Although these indicator taxa are unlikely to provide information about the effect of land-use change on soil biodiversity at large spatial scales, these species do drive assemblage differences between land-use types. Soil DNA metabarcoding could therefore assist land managers in monitoring soil biodiversity and quality.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105891"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131940","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"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":"Bison and burn timing shape arbuscular mycorrhizal diversity and community composition in tallgrass prairie restorations","authors":"Jennifer K. Bell ,&nbsp;Wesley D. Swingley ,&nbsp;Meghan G. Midgley","doi":"10.1016/j.apsoil.2025.105895","DOIUrl":"10.1016/j.apsoil.2025.105895","url":null,"abstract":"<div><div>Understanding how restoration and management practices of tallgrass prairie ecosystems impact soil microbial communities is vital to mitigating biodiversity loss. However, the impact of management practices on arbuscular mycorrhizal fungal (AMF) communities remains a critical unknown. Both bison and fire are commonly used as management practices to mimic historical conditions. Here, we examine how bison presence and fire timing (spring, fall, and no burning) impact the structure of AMF communities in tallgrass prairies restorations ranging in age from 2 to 35 years. Additionally, these restorations were compared to two remnant prairies and two agricultural fields. Restoration age had little effect on AMF community composition and diversity, and remnant and agricultural units were not distinct from restorations, suggesting that the AMF community will likely be restored in conjunction with the active management of the plant community. However, burning led to ephemeral decreases in AMF evenness and diversity. Additionally, bison presence significantly altered AMF community composition, concurrently dampening otherwise strong positive relationships between common AMF abundances and soil C: N. Overall, active prairie management had a larger effect on AMF communities and diversity than prairie restoration age.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105895"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131977","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Increased carbon sequestration of different straw return depths varies temporally","authors":"Jin Li ,&nbsp;Xiaoyu Li ,&nbsp;Ling Ma ,&nbsp;Guangyan Liu ,&nbsp;Yanyu Han ,&nbsp;Jiaqi Li ,&nbsp;Roland Bol ,&nbsp;Hongtao Zou","doi":"10.1016/j.apsoil.2025.105904","DOIUrl":"10.1016/j.apsoil.2025.105904","url":null,"abstract":"<div><div>Straw return strategies are widely used to increase soil organic carbon (SOC) sequestration and alleviate climate change, depending on the involvement of microorganisms. However, the dynamic response of SOC sequestration to continuous straw return is still unclear, especially considering the complex interactions between microbial community composition, functional genes, and SOC components. A continuous field experiment was monitored in 2021–2022 to investigate the dynamics effects of straw management practices, including shallow return (SF), mulch return (MF), deep return (DF) treatments, and no straw return (CK), on microbial r and K strategies, carbon cycle genes (carbon degradation and fixation), and soil humus. The microbial r-strategists (Proteobacteria and Bacteroidota) and carbon cycle genes in the subsoil exhibited differential response to the 2-years between SF and DF treatments, with DF being lower in 2021 but significantly higher in 2022 than SF. The higher carbon cycle genes in DF compared with SF, MF and CK treatments in the subsoil in 2022 were associated with the highest microbial r/K strategy ratio, which had a value of 3.9. The subsoil humic acid (HA) and humin (HU) content in 2021 were increased by 9.3 %–11.9 % and 10.4 %–22.8 % in SF compared with DF, MF and CK treatments. However, in the subsoil in 2022, SOC, HA and HU content in DF were significantly higher by 14.9 %–24.4 %, 5.7 %–25.2 % and 15.0 %–30.5 %, compared with SF, MF and CK treatments respectively. Partial least-squares pathway modeling also confirmed that increased HU content and carbon fixation genes abundance were the direct cause of the observed enhanced SOC. Therefore, over long-time scales, the DF method is likely the most beneficial straw management for SOC sequestration, soil nutrients and biological properties and optimally contributing to global sustainable agriculture development goals.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105904"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131978","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Insect residual streams supplement improves chili pepper growth: Insights into the role of rhizosphere soil microbiome and metabolome","authors":"Hanghai Zhou ,&nbsp;Xusong Zheng ,&nbsp;Zhigang Zhu ,&nbsp;Qi Shen ,&nbsp;Chenghu Yang ,&nbsp;Lijia Jiang ,&nbsp;Hua Li ,&nbsp;Yuxue Liu ,&nbsp;Xiaohong Yao ,&nbsp;Hong Sun ,&nbsp;Xin Wang ,&nbsp;Chunfang Zhang ,&nbsp;Yifei Wu ,&nbsp;Jiangwu Tang","doi":"10.1016/j.apsoil.2024.105838","DOIUrl":"10.1016/j.apsoil.2024.105838","url":null,"abstract":"<div><div>Insect frass and exuviae represent typical residual streams of insect farming and demonstrate great potential for ameliorating soil properties and improving plant growth. Yet, the effects of frass and exuviae on the rhizosphere microbiome and metabolome remain unclear. In this study, we cultivated <em>Capsicum annuum</em> var. <em>longum</em> Bailey, a typical chili pepper variety, under fertilization with different concentrations and combinations of frass and exuviae from <em>Corcyra cephalonica</em> Stainton with the aim of elucidating the impacts of insect residual streams (IRSs) on the rhizosphere soil metabolic profile. We found that both frass and exuviae effectively raised the soil fertility and nutrient bioavailability and markedly improved the enzyme activities (i.e., catalase, β-glucosidase, urease, and alkaline phosphatase). Microbial community analysis showed that supplementation with frass and exuviae enriched potential plant-beneficial microbiota, such as <em>Sphingobium</em>, <em>Steroidobacter</em>, and <em>Humicola</em>, in rhizosphere soils. Meanwhile, frass and exuviae enhanced certain carbon and nitrogen cycle-associated functions (e.g., chitinolysis and cellulolysis) and substantially reduced the abundance of plant pathogens, as revealed by microbial community function prediction. Investigation of the rhizosphere metabolic profile showed that supplementation with exuviae or frass induced the enrichment of metabolites related to plant growth regulation, pathogen inhibition, and plant–microbiota interactions. Moreover, correlation-based network analysis revealed strengthened synergistic microbial cooperation under treatment with frass and exuviae. Finally, the ameliorated soil microenvironment improved photosynthesis and promoted chili pepper growth. We concluded that insect frass and exuviae facilitate chili pepper growth through modifying the rhizosphere microbiome and metabolome, in addition to promoting soil fertility. The outcomes offer novel insights into how plant–microbiota interactions are regulated by IRSs, providing practical implications for agricultural applications.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105838"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143132093","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"12-year N addition enhances soil organic carbon decomposition by mediating microbial community composition in temperate plantations","authors":"Xinyi Wu ,&nbsp;Yanyan Liu ,&nbsp;Hongjin Zhang ,&nbsp;Lizheng Dong ,&nbsp;Yiping Zuo ,&nbsp;Xiaoyue Li ,&nbsp;Wei Wang","doi":"10.1016/j.apsoil.2024.105856","DOIUrl":"10.1016/j.apsoil.2024.105856","url":null,"abstract":"<div><div>Soil respiration is a crucial contributor to atmospheric CO₂ flux and microbial communities play a vital role in carbon cycling in terrestrial ecosystems. However, the response of microbial community characteristics (such as diversity and composition) and their roles in regulating soil respiration under nitrogen (N) deposition remain unclear. Here, we conducted a 12-year N addition experiment (0, 2, 5, 10 g N m⁻² year⁻¹) in a temperate plantation to elucidate the mechanisms of autotrophic respiration and heterotrophic respiration in response to environmental and microbial factors. The results showed heterotrophic respiration increased significantly only under high-N addition (10 g N m⁻² year⁻¹), and autotrophic respiration decreased significantly under moderate-N (5 g N m⁻² year⁻¹) and high-N addition (10 g N m⁻² year⁻¹). The decrease in autotrophic respiration was primarily driven by environmental factors, such as soil pH and N availability, whereas the increase in heterotrophic respiration resulted from changes in the microbial community. Fungi Leotiomycetes, Sordariomycetes, and Rhizophydiomycetes were identified as the key microbial predictors influencing heterotrophic respiration under N addition. Our work identified the role of soil microbial community composition in promoting soil organic matter decomposition under long-term N deposition. And we emphasized the importance of incorporating microbial community information into ecosystem models to improve predictions of climate‑carbon cycle feedbacks.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105856"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131686","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The dominance of K-strategy microbes enhances the potential of soil carbon decomposition under long-term warming","authors":"Yanli Gao ,&nbsp;Jiacong Zhou ,&nbsp;Teng-chiu Lin ,&nbsp;Yiqing Li ,&nbsp;Quanxin Zeng ,&nbsp;Shidong Chen ,&nbsp;Decheng Xiong ,&nbsp;Qiufang Zhang ,&nbsp;Zhijie Yang ,&nbsp;Yusheng Yang","doi":"10.1016/j.apsoil.2024.105854","DOIUrl":"10.1016/j.apsoil.2024.105854","url":null,"abstract":"<div><div>Soil microorganisms play a central role in regulating ecosystem carbon (C) cycle. Changes in soil microbial communities caused by climate warming could have pervasive impact on terrestrial ecosystem C cycle. However, how soil microbial community, a key player in C cycle in subtropical forests, responds to long-term warming is poorly characterized. We conducted a long-term (6-year) soil warming experiment in a subtropical forest to examine the response of microbial community structure, C-associated metabolic function, and respiration to two levels of soil warming (+2 °C and +5 °C). Both bacterial and fungal alpha-diversity declined under warming treatments. The increased microbial ratio of K- to r-strategists suggests that warming promoted the dominance of K-strategy microbes. C-degradation genes abundance and associated enzyme activities increased by soil warming. Moreover, warming decreased soil organic C content and increased soil microbial respiration under both warming levels. Our results indicate that future global warming can accelerate soil C decomposition in subtropical forests through altering the structure of microbial communities and promoting the C-associated metabolic function.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105854"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131693","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"The responses of oribatid mites to grazer exclusion in a boreal forest over different time scales","authors":"Maria Väisänen ,&nbsp;Inkeri Markkula","doi":"10.1016/j.apsoil.2024.105829","DOIUrl":"10.1016/j.apsoil.2024.105829","url":null,"abstract":"<div><div>Oribatid mites (Acari: Oribatida) represent an especially abundant and species-rich group of soil fauna in northern boreal forests. They contribute significantly to the complexity of soil food webs, nutrient cycling and organic matter decomposition. Thus, their role in ecosystem functioning may be pronounced, and consequently, understanding their responses to environmental changes is important. Northern boreal forests often have patchy ground vegetation – i.e., the dominance of lichens vs mosses and dwarf shrubs varies – and are affected by reindeer (<em>Rangifer tarandus tarandus</em> L.) that can impact the abiotic and biotic environment via eating plants, fertilization, and trampling. Here, we studied how differences in reindeer grazing affect oribatid mite community composition, feeding guilds, and life traits and whether the responses of Oribatida depend on the habitat type. We did this by comparing reindeer grazed areas with short-term and long-term ungrazed areas in sunlit, lichen-dominated and in shaded, moss and dwarf shrub-dominated habitats of an oligotrophic Scots pine forest in NE Finland. Grazing treatments affected oribatid mite species composition and these effects depended on the habitat. For example, in the sunlit habitats, the short-term ungrazed treatment benefitted <em>Chamobates pusillus</em>, while the long-term ungrazed treatment benefitted <em>Carabodes labyrinthicus</em>. On the contrary, grazing treatments did not induce any significant differences in the abundances of feeding guilds and life traits. To conclude, we propose that the cessation of reindeer grazing can affect the species composition of oribatid mites over different time spans by impacting the abundance of less common oribatid species, while ecological functions associated with different ecological and life traits of oribatid mites may remain stable under changing reindeer grazing.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105829"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131996","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Higher endogenous labile organic carbon decreases the temperature sensitivity of soil organic matter decomposition in two subtropical forests","authors":"Di Ma ,&nbsp;Yu Sun ,&nbsp;Min Liu ,&nbsp;Huajun Fang ,&nbsp;Xingliang Xu","doi":"10.1016/j.apsoil.2024.105816","DOIUrl":"10.1016/j.apsoil.2024.105816","url":null,"abstract":"<div><div>The impact of climate change on terrestrial carbon (C) balance largely depends on the temperature sensitivity of soil organic carbon (SOC) decomposition (Q₁₀). Soil C components are believed to regulate the temperature sensitivity of SOC decomposition. However, the regulatory role of endogenous labile organic carbon (LOC) remains unclear. To address this gap, soil samples were collected from two subtropical forests. Following centrifugal extraction to obtain LOC solutions, these were reintroduced back to the soil to adjust endogenous LOC concentrations at three levels (High-C, Medium-C, and Low-C). Subsequently, soil samples were incubated at three temperatures (i.e., 5 °C, 15 °C, and 25 °C) for 60 days to monitor CO₂ emissions. Results showed that cumulative CO₂ emissions from soils increased with endogenous LOC concentrations. In both subtropical forests, endogenous LOC significantly decreased the short-term (1 day) or mid-term (28 days) Q₁₀ of SOC decomposition. At the mid-term (28 days), High-C soils exhibited a notable increase in microbial biomass C (MBC). After 60 days, the most significant increase in microbial biomass nitrogen (MBN) was observed in High-C soils at 25 °C. Soil endogenous LOC concentrations notably influenced microbial quotient (<em>q</em>CO₂). Additionally, a positive correlation was noted between soil MBC and Q₁₀, while a negative correlation existed between soil MBN and Q_10. In conclusion, elevated endogenous LOC concentrations were found to reduce the temperature sensitivity of SOC decomposition by promoting microbial biomass growth and reducing <em>q</em>CO₂. These findings highlight the importance of endogenous LOC in assessing the impact of climate warming on SOC dynamics.</div></div>","PeriodicalId":8099,"journal":{"name":"Applied Soil Ecology","volume":"206 ","pages":"Article 105816"},"PeriodicalIF":4.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143131872","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"农林科学","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}