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Straw enhanced CO2 and CH4 but decreased N2O emissions from flooded paddy soils: Changes in microbial community compositions

文献类型： 外文期刊

作者： Wang, Ning 1 ; Yu, Jian-Guang 1 ; Zhao, Ya-Hui 1 ; Chang, Zhi-Zhou 2 ; Shi, Xiao-Xia 3 ; Ma, Lena Q. 3 ; Li, Hong-Bo 3 ;

作者机构： 1.Jiangsu Acad Agr Sci, Inst Agr Resources & Environm, Nanjing 210014, Jiangsu, Peoples R China

2.Jiangsu Acad Agr Sci, Lab Agr Wastes Treatment & Recycling, Circular Agr Res Ctr, Nanjing 210014, Jiangsu, Peoples R China

3.Nanjing Univ, Sch Environm, State Key Lab Pollut Control & Resource Reuse, Nanjing 210023, Jiangsu, Peoples R China

4.Univ Florida, Soil & Water Sci Dept, Gainesville, FL 32611 USA

关键词： Straw return;Paddy soil;Greenhouse gas;Microbial community compositions

期刊名称：ATMOSPHERIC ENVIRONMENT （ 影响因子：4.798； 五年影响因子：5.295 ）

ISSN： 1352-2310

年卷期： 2018 年 174 卷

页码：

收录情况： SCI

摘要： To explore microbial mechanisms of straw-induced changes in CO2, CH4, and N2O emissions from paddy field, wheat straw was amended to two paddy soils from Taizhou (TZ) and Yixing (YX), China for 60 d under flooded condition. Illumia sequencing was used to characterize shift in bacterial community compositions. Compared to control, 1-5% straw amendment significantly elevated CO2 and CH4 emissions with higher increase at higher application rates, mainly due to increased soil DOC concentrations. In contrast, straw amendment decreased N2O emission. Considering CO2, CH4, and N2O emissions as a whole, an overall increase in global warming potential was observed with straw amendment. Total CO2 and CH4 emissions from straw-amended soils were significantly higher for YX than TZ soil, suggesting that straw-induced greenhouse gas emissions depended on soil characteristics. The abundance of C-turnover bacteria Firmicutes increased from 28-41% to 54-77% with straw amendment, thereby increasing CO2 and CH4 emissions. However, straw amendment reduced the abundance of denitrifying bacteria Proteobacteria from 18% to 7.2-13% or increased the abundance of N2O reducing bacteria Clostridium from 7.6-11% to 13-30%, thereby decreasing N2O emission. The results suggested straw amendment strongly influenced greenhouse gas emissions via alerting soil properties and bacterial community compositions. Future field application is needed to ascertain the effects of straw return on greenhouse gas emissions.

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