数字农科院2.0

Soil and enzymatic C:N:P stoichiometry response to carbon and nutrient input: evidence from long-term fertilization experiments

文献类型： 外文期刊

作者： Xiao, Qiong;Huang, Yaping;Chen, Guoping;Liu, Kailou;Jiang, Yu;Zhou, Boku;Zhu, Ping;Han, Xiaori;Ma, Junyong;Liu, Shutang;Huang, Shaomin;Zhang, Aijun;Wang, Jidong;Hua, Keke;Li, Dongchu;Xu, Minggang;Zhang, Wenju

作者机构：

关键词： C:N:P stoichiometry;Arable soil;Extracellular enzyme activity;Climate zone;Long-term fertilization

期刊名称： PLANT AND SOIL

ISSN： 0032-079X

年卷期： 2025 年

页码：

收录情况： SCIE（2025版）

摘要： Background and aims Soil and enzymatic stoichiometry are associated with microbial resource limitations. However, large-scale empirical evidence on how C:N:P stoichiometry in agricultural soils responds to fertilization remains limited. Methods We investigated soil and enzymatic C:N:P stoichiometry across a climate gradient (covering mid-temperate, warm-temperate, and subtropical zones) using 12 long-term fertilization trials including chemical NPK, organic amendments, and combined treatments.. Results Climate and fertilization interacted significantly to shape stoichiometric patterns. Mid-temperate zones exhibited higher soil and enzymatic C:N and C:P ratios than warmer regions. Fertilization, particularly organic amendment, reduced soil C:P and N:P ratios but did not significantly alter enzymatic stoichiometry. Vector analysis based on enzyme activities indicated stronger microbial C limitation in mid-temperate zones and predominant P limitation in subtropical zones. While fertilization did not alleviate C limitation, organic amendments reduced P limitation compared to chemical fertilizer treatments. Climate and soil properties explained approximately 52% of the variance in microbial C limitation and 63% in P limitation. Structural equation modeling identified mean annual temperature (MAT) as the primary driver of C limitation, whereas both MAT and fertilization regulated P limitation. Conclusion These findings underscore the need for climate-aware fertilization strategies to modulate microbial resource limitations and enhance soil fertility in intensively managed croplands.

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