Influence of straw incorporation with and without straw decomposer on soil bacterial community structure and function in a rice-wheat cropping system

  • Jun Zhao
  • Tian Ni
  • Weibing Xun
  • Xiaolei Huang
  • Qiwei Huang
  • Wei Ran
  • Biao Shen
  • Ruifu Zhang
  • Qirong Shen
Environmental biotechnology

DOI: 10.1007/s00253-017-8170-3

Cite this article as:
Zhao, J., Ni, T., Xun, W. et al. Appl Microbiol Biotechnol (2017). doi:10.1007/s00253-017-8170-3

Abstract

To study the influence of straw incorporation with and without straw decomposer on bacterial community structure and biological traits, a 3-year field experiments, including four treatments: control without fertilizer (CK), chemical fertilizer (NPK), chemical fertilizer plus 7500 kg ha−1 straw incorporation (NPKS), and chemical fertilizer plus 7500 kg ha−1 straw incorporation and 300 kg ha−1 straw decomposer (NPKSD), were performed in a rice-wheat cropping system in Changshu (CS) and Jintan (JT) city, respectively. Soil samples were taken right after wheat (June) and rice (October) harvest in both sites, respectively. The NPKS and NPKSD treatments consistently increased crop yields, cellulase activity, and bacterial abundance in both sampling times and sites. Moreover, the NPKS and NPKSD treatments altered soil bacterial community structure, particularly in the wheat harvest soils in both sites, separating from the CK and NPK treatments. In the rice harvest soils, both NPKS and NPKSD treatments had no considerable impacts on bacterial communities in CS, whereas the NPKSD treatment significantly shaped bacterial communities compared to the other treatments in JT. These practices also significantly shifted the bacterial composition of unique operational taxonomic units (OTUs) rather than shared OTUs. The relative abundances of copiotrophic bacteria (Proteobacteria, Betaproteobacteria, and Actinobacteria) were positively correlated with soil total N, available N, and available P. Taken together, these results indicate that application of straw incorporation with and without straw decomposer could particularly stimulate the copiotrophic bacteria, enhance the soil biological activity, and thus, contribute to the soil productivity and sustainability in agro-ecosystems.

Keywords

Straw incorporationStraw decomposerRice-wheat cropping systemLow-Middle Yangtze River plainBacterial community structure

Supplementary material

253_2017_8170_MOESM1_ESM.pdf (623 kb)
ESM 1(PDF 623 kb)

Copyright information

© Springer-Verlag Berlin Heidelberg 2017

Authors and Affiliations

  1. 1.Jiangsu Key Lab for Organic Waste UtilizationNanjing Agricultural UniversityNanjingChina
  2. 2.Key Laboratory of Microbial Resources Collection and Preservation, Ministry of AgricultureInstitute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural SciencesBeijingChina