Plant litter decomposition is regulated by its phosphorus content in the short term and soil enzymes in the long term

文献类型： 外文期刊

第一作者： Liu, Xiu

作者： Liu, Xiu;Tou, Congyue;Wu, Lianghuan;Ma, Qingxu;Liu, Xiu;Tou, Congyue;Wu, Lianghuan;Ma, Qingxu;Zhou, Jingjie;Chen, Ji;Wanek, Wolfgang;Chadwick, David R.;Jones, Davey L.

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关键词： Initial litter C:N:P ratio; C-13 -labeled plant litter; C:N:P stoichiometry; Microbial P limitation; Plant litter decomposition

期刊名称：GEODERMA （ 影响因子：6.6； 五年影响因子：7.3 ）

ISSN： 0016-7061

年卷期： 2025 年 457 卷

页码：

收录情况： SCI

摘要： Plant litter decomposition plays a vital role in soil carbon (C) cycling and nutrient release, significantly influencing agricultural resource utilization and soil fertility management. Litter quality-defined by its C, nitrogen (N), and phosphorus (P) contents, as well as C:N:P stoichiometry-is a key factor regulating its decomposition. However, the influence of litter C:P ratios on plant litter decomposition, particularly in relation to changes in soil C:N:P stoichiometry, microbial biomass, and extracellular enzyme activities, remains unclear, especially in agroecosystems. In this study, the effects of litter C:P ratios on its decomposition were investigated using C-13-labeled plant litter with naturally occurring gradients of C:P ratios (ranging from 377 to 1,288) in an 84-day incubation experiment. After 84 days, cumulative (CO2)-C-13 emissions derived from litter accounted for approximately 50 % of total CO2 emissions. Litter with higher P content increased (CO2)-C-13 emissions, whereas higher litter C:P ratios suppressed emissions, indicating that litter with lower C:P ratios decomposed more rapidly in the short-term (14 days). In contrast, elevated soil exoenzymatic C:P and N:P ratios stimulated (CO2)-C-13 emissions during long-term decomposition (84 days). These findings suggest that litter P content primarily regulates short-term decomposition, while soil enzyme activity plays a key role in long-term decomposition. Overall, this study highlights the pivotal role of P limitation in litter decomposition, particularly in the early stages, and underscores the potential benefits of P fertilization in enhancing decomposition rates, thereby improving resource efficiency and soil fertility in agroecosystems.

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