Linking nitrogen- and straw-sensitive indicator species and their co-occurrences to priming effect in agricultural soil exposed to long-term nitrogen fertilization

文献类型： 外文期刊

第一作者： Chen, Hao

作者： Chen, Hao;Li, Wenjuan;Zheng, Wanning;Yin, Chang;Fan, Xiaoping;Ye, Mujun;Gao, Zixiang;Liang, Yongchao;Yin, Chang;Wu, Chunyan

作者机构：

关键词： Priming effect; Oligotroph; Copiotroph; Co-occurrence network; Extracellular enzyme activity; N mining

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：9.7； 五年影响因子：10.2 ）

ISSN： 0038-0717

年卷期： 2023 年 176 卷

页码：

收录情况： SCI

摘要： The increasing input of nitrogen (N) fertilizers has a considerable impact on agricultural soil carbon (C) cycling due to its influence on soil microbial abundance and assemblages. However, the microbial mechanism underlying the response of straw-induced priming effect to long-term N application remains an open question. Here, using soils with three N fertilization levels (0, 300, and 570 kg N ha(-1) y(-1)) from a long-term experimental site, we established a 40-day microcosm experiment to investigate the priming effect of straw addition on SOM miner-alization and the associated microbial activity and community composition. We found that long-term N appli-cation significantly inhibited soil respiration while increasing straw-induced priming effect. The soil microbial biomass (including bacterial and fungal abundance) decreased with increasing N levels, accompanied by decreased bacterial alpha-diversity and altered beta-diversity. In addition, the N fertilization level significantly influ-enced bacterial and fungal indicator species that were sensitive to straw addition (siOTUs) and long-term N fertilization (niOTUs), as well as their co-occurrence patterns. In the first three days of straw decomposition, long-term N fertilization decreased the oligotroph-to-copiotroph ratio of bacterial siOTUs. In contrast, long-term N fertilization increased this ratio on days 20 and 40, along with facilitated microbial investment in extracellular enzymes and microbial N demand. This caused a stronger "N mining" process and consequently enhanced the priming effect in soil exposed to long-term N fertilization at the later stage of incubation. Linking indicator species analysis with priming effect, these results advance our understanding of the complex C cycling in agricultural soils undergoing long-term nitrogen management.

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