title: Influence of straw incorporation with and without straw decomposer on soil bacterial community structure and function in a rice-wheat cropping system.
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-1straw incorporation (NPKS), and chemical fertilizer plus 7500 kg ha-1straw incorporation and 300 kg ha-1straw 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.
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Jun
authors.identifier: http://orcid.org/0000-0002-6691-2999
authors.initials: J
authors.lastname: Zhao
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Tian
authors.initials: T
authors.lastname: Ni
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Weibing
authors.initials: W
authors.lastname: Xun
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Xiaolei
authors.initials: X
authors.lastname: Huang
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China. qwhuang@njau.edu.cn.
authors.forename: Qiwei
authors.initials: Q
authors.lastname: Huang
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Wei
authors.initials: W
authors.lastname: Ran
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Biao
authors.initials: B
authors.lastname: Shen
authors.affiliation: Key Laboratory of Microbial Resources Collection and Preservation, Ministry of Agriculture, Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing, 100081, China.
authors.forename: Ruifu
authors.initials: R
authors.lastname: Zhang
authors.affiliation: Jiangsu Key Lab for Organic Waste Utilization, Nanjing Agricultural University, Nanjing, 210095, China.
authors.forename: Qirong
authors.initials: Q
authors.lastname: Shen
mesh_terms: D000383:Agriculture / Q000379:methods; D001419:Bacteria / Q000145:classification / Q000187:drug effects / Q000302:isolation & purification; D018556:Crops, Agricultural; D017753:Ecosystem; D005308:Fertilizers / Q000032:analysis; D059013:Microbial Consortia / Q000187:drug effects / Q000502:physiology*; D009584:Nitrogen / Q000494:pharmacology; D012275:Oryza / Q000254:growth & development*; D010758:Phosphorus / Q000494:pharmacology; D011188:Potassium / Q000494:pharmacology; D012987:Soil / Q000737:chemistry*; D012988:Soil Microbiology; D014908:Triticum / Q000254:growth & development*
chemical_list: D005308:Fertilizers; D012987:Soil; D010758:Phosphorus; D009584:Nitrogen; D011188:Potassium
keywords: Bacterial community structure; Low-Middle Yangtze River plain; Rice-wheat cropping system; Straw decomposer; Straw incorporation