The influence of straw returning on N2O emissions from a maize-wheat field in the North China Plain.
Crop straw returning has become a prevailing cultivation practice in the vast area of the North China Plain (NCP), while few investigations about its influence on nitrous oxide (N2O) emission have been conducted. In this study, N2O emissions from an agricultural field in the NCP with and without straw returning were comparably investigated by using static chambers in two consecutive maize-wheat growing seasons from June 2010 to June 2012. Compared with the NP treatment (compound nitrogen fertilizer only), the cumulative N2O emission from the SP treatment (compound nitrogen fertilizer plus straw) increased about 150% during the maize season in 2010, but decreased by about 35% during the maize season in 2011. The inconsistent influence of straw returning on N2O emission from the maize field was ascribed to the evidently different soil moisture between the two years, which was further confirmed by laboratory simulation experiments. About 40% reduction of N2O emission from the SP treatment during the two winter wheat seasons, which was mainly attributed to anoxic condition induced by rotting the maize straw.
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Yizhen
Y
Zhou
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Yuanyuan
Y
Zhang
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Di
D
Tian
Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Center for Excellence in Regional Atmospheric Environment, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China; University of Chinese Academy of Sciences, Beijing 100049, China. Electronic address: yjmu@rcees.ac.cn.
Yujing
Y
Mu
D000383:Agriculture; D002681:China; D004784:Environmental Monitoring; D005308:Fertilizers; D009609:Nitrous Oxide / Q000032:analysis*; D012621:Seasons; D012987:Soil; D014908:Triticum / Q000254:growth & development*; D003313:Zea mays / Q000254:growth & development*
D005308:Fertilizers; D012987:Soil; D009609:Nitrous Oxide
Nitrous oxide; North China Plain; Soil moisture; Straw returning