Long-term manuring increases microbial carbon use efficiency and mitigates priming effect via alleviated soil acidification and resource limitation

文献类型： 外文期刊

第一作者： Xiao, Qiong

作者： Xiao, Qiong;Huang, Yaping;Wu, Lei;Tian, Yanfang;Wang, Qiqi;Wang, Boren;Xu, Minggang;Zhang, Wenju;Wang, Boren

作者机构：

关键词： Long-term fertilization; Soil pH; Resource stoichiometry; Enzyme activity; Soil C sequestration

期刊名称：BIOLOGY AND FERTILITY OF SOILS （ 影响因子：6.432； 五年影响因子：6.332 ）

ISSN： 0178-2762

年卷期： 2021 年 57 卷 7 期

页码：

收录情况： SCI

摘要： No fertilized soils (unfertilized and fallow treatments) and soils subjected to 28-year fertilization regimes, including mineral fertilization (PK and NPK) and manure amendments (NPKM and M), were incubated with or without C-13 - glucose. Results showed that compared to mineral fertilization (0.64 - 0.69), the manure amendments significantly increased microbial C use efficiency (CUE) (0.76 - 0.79), mainly due to higher soil pH, lower resource stoichiometric ratios of dissolved organic C (DOC): mineral N, DOC: available P and mineral N: available P, and lower specific activities (per microbial biomass C unit) of beta-1,4-glucosidase, N-acetyl-glucosaminidase and acid phosphatase. Glucose addition increased SOC mineralization, inducing positive priming effect (PE) with lower values in the manure amendments (0.11 - 0.12 mg C g(-1) SOC) relative to mineral fertilization (0.25 - 0.55 mg C g(-1) SOC). The PE was negatively correlated with soil pH and positively associated with resource stoichiometric ratios of DOC: mineral N, DOC: available P and mineral N: available P, mainly due to microbes mineralizing SOM to release nutrients, as indicated by the positive relationships between PE and the specific activities of N-acetyl-glucosaminidase and acid phosphatase. Concluding, relative to mineral fertilization, long-term manure amendment could increase CUE and decrease PE via alleviated soil acidification and resource limitation, thus facilitating soil C sequestration.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序