【摘 要】
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Effects of different straw return modes on greenhouse gas(GHG)emissions have been studied by many field experiments in rice-based ecosystem.However,the influencing mechanism is not clear.An incubation
【机 构】
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College of Agriculture,Nanjing Agricultural University,Nanjing 210095,China
【出 处】
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中国农学会耕作制度分会2016年学术年会
论文部分内容阅读
Effects of different straw return modes on greenhouse gas(GHG)emissions have been studied by many field experiments in rice-based ecosystem.However,the influencing mechanism is not clear.An incubation experiment was conducted to simulate and determine the effects of four wheat straw incorporation modes(straw return with rotary tillage(WR),plowing(WP)and ditch-buried(WD))on GHG emissions during the flooding and then non-flooded period.Results indicated that wheat straw addition stimulated CO2 emissions,and that reached peaks after drainage.Compared with WD,WR and WP had significantly higher CO2 emissions,with the increment of 461.9%and 340.6%,respectively.CH4 emissions were significantly increased under wheat straw incorporation,and mainly occurred during the flooded period.Compared to WR and WP,WD significantly reduced CH4 emission,with the decrement of 5.66 and 2.51 times,respectively.N2O emissions were mainly focused from Day 16 to 30,and wheat straw addition decreased N2O emission.Compared with WD,WP and WR had significantly lower N2O emissions.The GWP was significantly lower under WD than that under WR and WP during both flooding and non-flooding period.These results showed that WD could significantly reduce GHG emissions compared with WR and WP.Moreover,there was a significantly higher soil DOC content under WD than WR and WP,while soil NH4+-N contents were on the contrary.Four wheat straw incorporation modes provided different soil available C and N contents due to the diverse straw decomposition rate,thus,leading to the discrepancy in GHG emissions.
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