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典型菜地土壤剖面N2O浓度、扩散通量与净周转率变化
引用本文:马智勇,贾俊香,熊正琴,许剑敏,王玲,张菁.典型菜地土壤剖面N2O浓度、扩散通量与净周转率变化[J].应用与环境生物学报,2019(3):611-616.
作者姓名:马智勇  贾俊香  熊正琴  许剑敏  王玲  张菁
作者单位:山西农业大学资源环境学院;南京农业大学资源与环境科学学院
基金项目:山西省自然科学基金项目(201701D121118);国家重点研发计划项目(2018YFD0200401)资助~~
摘    要:利用地下气体原位采集系统-气相色谱法,周年监测休耕裸地与轮作菜地(茼蒿-空心菜-大青菜)7、15、30和50 cm土层N2O浓度变化,旨在探究菜地土壤剖面N2O扩散通量变化和净周转率.结果显示:菜地土壤剖面N2O浓度呈现较大的时空变异性,轮作菜地7、15、30和50 cm土层N2O平均浓度分别达到休耕裸地对应土层的1.9、8.7、9.2与26.7倍,0-30 cm土层土壤N2O浓度随土层深度增加而增加,30-50 cm土层逐渐降低,表明氮肥施用显著促进了上层土体内N2O的产生.休耕裸地与轮作菜地4个土层N2O扩散通量(以N计)变幅分别为-354-420μg m^-2 h^-1与482-1 510μg m^-2 h^-1,其中休耕裸地30-50 cm土层N2O扩散通量为负值,表明该土层N2O以吸收为主.轮作菜地7-15 cm土层N2O扩散通量最高为1 510μg m^-2 h^-1 ,分别比0-7 cm、15-30 cm与30-50 cm高68.1%、2.5%与36.6%,表明7-30 cm为N2O的主要产生位点.休耕裸地与轮作菜地0-15 cm土层间N2O净周转率以负值为主,15-50 cm以正值为主,表明N2O的周转在土壤剖面中层(7-30cm)最快.综上,N2O浓度在土层中的分布情况为从上到下先增加后减少,主要产生位点于30 cm土层并从该层向其上下层扩散输送;结果可为菜地土壤N2O产生位点的定位及其转化过程的研究提供参考.

关 键 词:菜地  土壤剖面  氧化亚氮  扩散通量  净周转率

Dynamics of N2O concentration,diffusion flux,and net turnover rate in the soil profile of a typical vegetable field
MA Zhiyong,JIA Junxiang,XIONG Zhengqin,XU Jianmin,WANG Ling,ZHANG Jing.Dynamics of N2O concentration,diffusion flux,and net turnover rate in the soil profile of a typical vegetable field[J].Chinese Journal of Applied and Environmental Biology,2019(3):611-616.
Authors:MA Zhiyong  JIA Junxiang  XIONG Zhengqin  XU Jianmin  WANG Ling  ZHANG Jing
Institution:(College of Resources and Environment, National Experimental Teaching Demonstration Center for Agricultural and Environmental, Shanxi Agricultural University, Taigu 030801, China;Jiangsu Key L aboratory of Low Carbon Agriculture and GHGs Mitigation / College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
Abstract:MA Zhiyong;JIA Junxiang;XIONG Zhengqin;XU Jianmin;WANG Ling;ZHANG Jing(College of Resources and Environment, National Experimental Teaching Demonstration Center for Agricultural and Environmental, Shanxi Agricultural University, Taigu 030801, China;Jiangsu Key L aboratory of Low Carbon Agriculture and GHGs Mitigation / College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China)
Keywords:vegetable plot  soil profile  nitrous oxide  diffusive flux  net turnover rate
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