Kai Dong, Zixin Chen, Suhui Ma, Xuemei Yang, Wenao Wu, Danhua Zhang, Chen Yang, Fan Fan, Jiangling Zhu, Chengjun Ji, Jingyun Fang
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Anthropogenic nitrogen (N) and phosphorus (P) inputs are altering soil nutrients, but their consequences for soil organic carbon (SOC) and its components in P-limited tropical forests are poorly understood.</p><h3 data-test=\"abstract-sub-heading\">Methods</h3><p>We conducted a 13-year-long nutrient addition experiment in two tropical montane forests to investigate the effects of N and P additions on soil particulate organic carbon (POC) and mineral-associated organic carbon (MAOC).</p><h3 data-test=\"abstract-sub-heading\">Results</h3><p>Long-term high-N addition increased soil POC concentration and its contribution to SOC through altering edaphic conditions (i.e., soil acidification and nutrient imbalance) and suppressing microbial biomass C together with activity of lignin-modifying enzymes. However, P addition had minor effects on POC pool, which was mainly attributed to alleviate P limitation and stimulate microbial decomposition. In addition, N and P additions did not significantly change soil MAOC in both forests.</p><h3 data-test=\"abstract-sub-heading\">Conclusion</h3><p>Our results indicated that soil microorganisms play key roles in regulating soil C cycling through extracellular enzymes under N and P additions, suggesting a necessity of incorporating it into the prediction of ecosystem C dynamics under global change.</p>","PeriodicalId":20223,"journal":{"name":"Plant and Soil","volume":"3 1","pages":""},"PeriodicalIF":3.9000,"publicationDate":"2025-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":"{\"title\":\"Effects of nitrogen and phosphorus additions on soil particulate organic carbon through altering microbial decomposition in two tropical montane rainforests\",\"authors\":\"Kai Dong, Zixin Chen, Suhui Ma, Xuemei Yang, Wenao Wu, Danhua Zhang, Chen Yang, Fan Fan, Jiangling Zhu, Chengjun Ji, Jingyun Fang\",\"doi\":\"10.1007/s11104-025-07538-9\",\"DOIUrl\":null,\"url\":null,\"abstract\":\"<h3 data-test=\\\"abstract-sub-heading\\\">Background and aims</h3><p>Nutrient availability affects soil microbial activity, thereby regulating soil carbon (C) formation, turnover and storage. 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Effects of nitrogen and phosphorus additions on soil particulate organic carbon through altering microbial decomposition in two tropical montane rainforests
Background and aims
Nutrient availability affects soil microbial activity, thereby regulating soil carbon (C) formation, turnover and storage. Anthropogenic nitrogen (N) and phosphorus (P) inputs are altering soil nutrients, but their consequences for soil organic carbon (SOC) and its components in P-limited tropical forests are poorly understood.
Methods
We conducted a 13-year-long nutrient addition experiment in two tropical montane forests to investigate the effects of N and P additions on soil particulate organic carbon (POC) and mineral-associated organic carbon (MAOC).
Results
Long-term high-N addition increased soil POC concentration and its contribution to SOC through altering edaphic conditions (i.e., soil acidification and nutrient imbalance) and suppressing microbial biomass C together with activity of lignin-modifying enzymes. However, P addition had minor effects on POC pool, which was mainly attributed to alleviate P limitation and stimulate microbial decomposition. In addition, N and P additions did not significantly change soil MAOC in both forests.
Conclusion
Our results indicated that soil microorganisms play key roles in regulating soil C cycling through extracellular enzymes under N and P additions, suggesting a necessity of incorporating it into the prediction of ecosystem C dynamics under global change.
期刊介绍：
Plant and Soil publishes original papers and review articles exploring the interface of plant biology and soil sciences, and that enhance our mechanistic understanding of plant-soil interactions. We focus on the interface of plant biology and soil sciences, and seek those manuscripts with a strong mechanistic component which develop and test hypotheses aimed at understanding underlying mechanisms of plant-soil interactions. Manuscripts can include both fundamental and applied aspects of mineral nutrition, plant water relations, symbiotic and pathogenic plant-microbe interactions, root anatomy and morphology, soil biology, ecology, agrochemistry and agrophysics, as long as they are hypothesis-driven and enhance our mechanistic understanding. Articles including a major molecular or modelling component also fall within the scope of the journal. All contributions appear in the English language, with consistent spelling, using either American or British English.
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