生态环境学报2017，Vol.26Issue(11)：1844-1855,12.DOI:10.16258/j.cnki.1674-5906.2017.11.004
水分管理和秸秆还田对稻麦轮作系统温室气体排放的综合效应
Effects of Water Regimes and Straw Incorporation on Greenhouse Gas Emissions in A Rice-wheat Cropping System
摘要
Abstract
Irrigation mode and straw incorporation play important roles in regulating greenhouse gas emissions and increasing crop yield, which has received extensive attention in agricultural production. In order to clarify the influence of the water management and straw incorporation on the global warming potential (GWP) and crop yield of rice-wheat rotation system, the field experiment was carried out for two years. In the traditional irrigation (TI) and controlled irrigation (CI), on the basis of two modes, they were set to returning wheat straw (WS), biochar returning (BC), no straw returning (NS) three straw management.The rice-wheat rotation system was evaluated for CH4 and N2O emission monitoring and crop yield. It provided the scientific basis for the sustainable development of agriculture by selecting the optimal water management and straw returning combination.The results showed that compared with NS treatment, the annual CH4 emission of WS and BC increased by 106.02% and 36.77%, respectively, while the average annual N2O emission decreased by 27.25% and 16.21%, respectively.The average yield of rice was increased by 6.49% and 5.90%, respectively, and the annual GWPyield-scaled increased by 40.53% and 8.07%, respectively.In the whole rotation cycle, the CH4 emission of CI system decreased by 79.63% compared with TI, and N2O emission increased by 27.03%, the average yield of rice was increased by 0.42%, and the GWPyield-scaleddecreased by 60.32%. Controlled irrigation with biochar(CIB) had the lowest GWPyield-scaled, which was 53.81%, 70.49%, 59.77%, 4.46%, 11.92% lower than traditional irrigation with no straw returning(TINS), traditional irrigation with wheat straw(TIS), traditional irrigation with biochar(TIB), controlled irrigation with no straw returning(CINS), and controlled irrigation with wheat straw(CIS), respectively. Significant interactions between irrigation mode and straw management practices were found on annual greenhouse gas emissions, but not on crop yields.It can be seen that controlled irrigation withbiochar may reduce greenhouse gas emissions while increase crop yield in rice-wheat cropping areas.关键词
水分管理/秸秆还田/稻麦轮作系统/温室气体排放Key words
irrigation mode/straw incorporation/rice–wheat rotation system/greenhouse gas emissions分类
资源环境引用本文复制引用
杭玉浩,王强盛,许国春,刘欣..水分管理和秸秆还田对稻麦轮作系统温室气体排放的综合效应[J].生态环境学报,2017,26(11):1844-1855,12.基金项目
江苏省农业三新工程项目(SXGC[2015]259 （）
SXGC[2016]309) （）
