Effects of nitrogen and phosphorus additions on soil particulate organic carbon through altering microbial decomposition in two tropical montane rainforests

IF 3.9 2区农林科学 Q1 AGRONOMY

Plant and Soil Pub Date : 2025-05-13 DOI:10.1007/s11104-025-07538-9

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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引用次数: 0

Abstract

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.

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添加氮磷通过改变两种热带山地雨林微生物分解对土壤颗粒有机碳的影响

背景和目的养分有效性影响土壤微生物活性，从而调节土壤碳(C)的形成、周转和储存。人为氮(N)和磷(P)输入正在改变土壤养分，但它们对磷限制热带森林土壤有机碳（SOC）及其组分的影响尚不清楚。方法在2个热带山地森林进行了为期13年的养分添加试验，研究氮、磷添加对土壤颗粒有机碳（POC）和矿物相关有机碳（MAOC）的影响。结果长期高氮添加通过改变土壤酸化和养分失衡等土壤条件，抑制微生物生物量C和木质素修饰酶活性，提高了土壤POC浓度及其对有机碳的贡献。添加磷对POC池的影响较小，主要是缓解了磷的限制，促进了微生物的分解。此外，添加氮和磷对两种森林土壤MAOC没有显著影响。结论土壤微生物在氮、磷添加下通过胞外酶调节土壤碳循环中发挥关键作用，有必要将其纳入全球变化下生态系统碳动态的预测中。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Plant and Soil 农林科学-农艺学

CiteScore

8.20

自引率

8.20%

发文量

543

审稿时长

2.5 months

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.