N_(x)O emissions in response to the irrigation lower limits under different irrigation modes in a lettuce field  

作　　者：Maomao Hou Ying Xiao Qinyuan Zhu Jingnan Chen Huan Huang Qiu Jin Lin Zhu Fenglin Zhong 

机构地区：[1]College of Horticulture,Fujian Agriculture and Forest University,Fuzhou 350000,China [2]Nanjing Institute of Environmental Sciences,Nanjing 210000,China [3]College of Horticulture and Gardening,Fujian Agricultural Vocational and Technical College,Fuzhou 350000,China [4]Juhuang Group Co.,Ltd.,Xiamen 361021,China [5]Nanjing Hydraulic Research Institute,Nanjing 210000,China

出　　处：《International Journal of Agricultural and Biological Engineering》2023年第4期159-166,共8页国际农业与生物工程学报（英文）

基　　金：supported by the cross fusion project“Green Civil Engineering and Water Conservancy”(000-71202103D);Young and Middle-aged Project of Education Department of Fujian Province(JAT210784);Natural Science Foundation of Fujian province(2023J01133579).

摘　　要：Irrigation has a significant impact on N_(x)O(N_(2)O and NO)emissions from cultivated land,yet the N_(2)O or NO emission among the irrigation lower limits under different irrigation modes has not been well compared.In an irrigated lettuce field,three DR(drip irrigation)lower limits were designed,including 75%(DR1),65%(DR2)and 55%(DR3)field capacity,and one FI(furrow irrigation)lower limit(65%field capacity).The N_(2)O and NO emission fluxes and soil nitrogen(N)forms were determined,and the linear correlation between these indicators was analyzed.Results showed that under the same irrigation regime,the N_(2)O and NO emissions from furrow irrigation treatment increased by 36.8%and 45.2%respectively compared to that from drip irrigation treatment.The cumulative N_(2)O and NO emissions under DR3 were 30.2%and 28.6%higher than under DR1,respectively.Moreover,DR1 was also the lowest among the four treatments in soil-N concentration.The N_(2)O and NO emission fluxes were more correlated to soil NH_(4)^(+)-N(r=0.88 and 0.76)or NO_(2)^(-)-N(r=0.90 and 0.80)concentration than soil-N and soluble organic N,indicating that N_(2)O and NO were mainly produced by the soil nitrification process.When the irrigation regime was the same,N_(2)O and NO emissions were lower with drip irrigation than with furrow irrigation.Besides,drip irrigation with small quota but high frequency reduced N_(2)O and NO emission compared to that with large quota but low frequency.

关 键 词：nitrous oxide nitric oxide drip irrigation furrow irrigation soil nitrogen 

分 类 号：S27[农业科学—农业水土工程]