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

稻草 人类受精 微观世界 农学 矿化(土壤科学) 氮气 生物 微生物种群生物学 土壤水分 启动(农业) 化学 生态学 环境化学 苗木 细菌 遗传学 有机化学
作者
Hao Chen,Wenjuan Li,Wanning Zheng,Chang Yin,Xiaoping Fan,Mujun Ye,Zixiang Gao,Chunxiao Wu,Yongchao Liang
出处
期刊:Soil Biology & Biochemistry [Elsevier BV]
卷期号:176: 108881-108881 被引量:9
标识
DOI:10.1016/j.soilbio.2022.108881
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 mineralization and the associated microbial activity and community composition. We found that long-term N application 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 α-diversity and altered β-diversity. In addition, the N fertilization level significantly influenced 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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