Soil phosphorus availability is enhanced by nitrogen and litter addition during the growing season
文献类型： 外文期刊
第一作者： Zhang, Yifan
作者： Zhang, Yifan;Ma, Zhenbiao;Li, Xinyang;Wu, Jinfeng;Li, Zimeng;Yang, Zhanbo;Jiang, Shicheng;Yue, Xiuquan;Li, Yanan;Wang, Deli;Liu, Jushan;Wan, Ho Yi;Pan, Duofeng
作者机构：
关键词： Nitrogen deposition; Phosphorus availability; Litter manipulation; Semi-arid grassland
期刊名称：PLANT AND SOIL （ 影响因子：4.9； 五年影响因子：5.2 ）
ISSN： 0032-079X
年卷期： 2024 年
页码：
收录情况： SCI
摘要： Background and aimsLitter input plays an important role in maintaining soil phosphorus (P) availability in terrestrial ecosystems. Moreover, nitrogen (N) deposition can alter litter accumulation and decomposition and, consequently, soil P availability. However, the combined effects of N and litter addition on soil P availability remain unclear.MethodsWe examined how N addition (0 and 10 g N m-2 yr-1) and litter manipulation (initial litter, litter removal and litter addition) affected the seasonal dynamics of soil P availability in an 11-year grassland experiment.ResultsDuring the mid-growing season, N addition significantly increased soil available P but decreased soil total P, while litter addition increased soil total P. At the end of the growing season, litter addition increased soil available P, while N addition increased soil total P. Structural equation modelling (SEM) revealed that N addition increased soil available P by increasing aboveground biomass and decreasing soil pH during the mid-growing season. At the end of the growing season, litter addition increased soil available P by enhancing microbial biomass P.ConclusionOur findings suggested that N and litter addition increased soil P availability from the middle to the end of the growing season. Moreover, the positive effects of litter on soil available and total P under N addition at the end of the growing season indicated that grassland management that reduce litter accumulation, such as grazing and mowing, may decrease the soil P supply under increased N deposition.
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