Contributions of residue-C and -N to plant growth and soil organic matter pools under planted and unplanted conditions

文献类型： 外文期刊

第一作者： Li, Zengqiang

作者： Li, Zengqiang;Zhao, Bingzi;Jia, Zhongjun;Cai, Yuanfeng;Zhang, Jiabao;Li, Zengqiang;Olk, Daniel C.;Mao, Jingdong

作者机构：

关键词： C-13/N-15 labeled residue; Residue N recovery; Residue C recovery; Soil moisture; Microbial community composition; C-13-PLFA

期刊名称：SOIL BIOLOGY & BIOCHEMISTRY （ 影响因子：7.609； 五年影响因子：8.312 ）

ISSN： 0038-0717

年卷期： 2018 年 120 卷

页码：

收录情况： SCI

摘要： Soil microorganisms are considered the most effective decomposers of applied crop residues, but it is poorly understood which communities are primarily responsible for decomposition under different conditions. A pot experiment was conducted in a greenhouse to follow the cycling of C and N derived from maize (Zea mays L.) residues labeled with both C-13 and N-15 to a subsequent winter wheat (Triticum aestivum L.) crop and to soil pools under planting with winter wheat (+P) or an unplanted control (-P), both in soil maintained at field moisture capacities of 40% and 80%. Soil microbes involved in residue decomposition were investigated by C-13 phospholipid fatty acid (C-13-PLFA) analysis technique. At wheat maturity, a total of 68% of residue N was recovered in the +P treatments, in which 26% was recovered from wheat plants and another 42% from soil total N (TN), independent of the water regimes, while only 50% was recovered from TN in the -P treatments. More residue C was recovered as soil organic carbon in +P than -P treatments (33% vs. 27%), and the trend became more significant with soil moisture. In addition, the +P soil had 35-48% larger microbial biomass carbon (MBC) than the -P soil, and more residue C was recovered as MBC in +P than -P treatments (7% vs. 4%), suggesting the induced microbial utilization of the applied residues. The distribution of the residue-derived PLFA-C showed that only 16:1 omega 7c and 18:1 omega 7c had larger relative abundances in the +P than the -P soils, suggesting that they were mainly stimulated by the presence of wheat and that they may be the most important fatty acids to define the different recoveries of residue N and C between the planted and unplanted conditions. Our results demonstrate that the enhanced recovery of residue-C and -N by the presence of wheat plants was mainly from the induced microbial utilization of applied residues by altering the activities of specific microorganisms.

分类号：

  • 相关文献
作者其他论文 更多>>

微信小程序