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Nitrous oxide and nitric oxide emissions from an irrigated cotton field in Northern China

文献类型： 外文期刊

作者： Liu, Chunyan 1 ; Zheng, Xunhua 1 ; Zhou, Zaixing 1 ; Han, Shenghui 1 ; Wang, Yinghong 1 ; Wang, Kai 1 ; Liang, Wangguo 1 ;

作者机构： 1.Chinese Acad Sci, Inst Atmospher Phys, State Key Lab Atmospher Boundary Layer Phys & Atm, Beijing 100029, Peoples R China

2.Univ Melbourne, Dept Resource Management

关键词： fertilization;irrigation;cotton

期刊名称：PLANT AND SOIL （ 影响因子：4.192； 五年影响因子：4.712 ）

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收录情况： SCI

摘要： Cotton is one of the major crops worldwide and delivers fibers to textile industries across the globe. Its cultivation requires high nitrogen (N) input and additionally irrigation, and the combination of both has the potential to trigger high emissions of nitrous oxide (NO) and nitric oxide (NO), thereby contributing to rising levels of greenhouse gases in the atmosphere. Using an automated static chamber measuring system, we monitored in high temporal resolution NO and NO fluxes in an irrigated cotton field in Northern China, between January 1st and December 31st 2008. Mean daily fluxes varied between 5.8 to 373.0 peg NO-N mpohp# and 3.7 to 135.7 peg NO-N mpohp#, corresponding to an annual emission of 2.6 and 0.8 kg N hap#yrp# for NO and NO, respectively. The highest emissions of both gases were observed directly after the N fertilization and lasted approximately 1 month. During this time period, the emission was 0.85 and 0.22 kg N hap# for NO and NO, respectively, and was responsible for 32.3% and 29.0% of the annual total NO and NO loss. Soil temperature, moisture and mineral N content significantly affected the emissions of both gases (p<0.01). Direct emission factors were estimated to be 0.95% (NO) and 0.24% (NO). We also analyzed the effects of sampling time and frequency on the estimations of annual cumulative NO and NO emissions and found that low frequency measurements produced annual estimates which differed widely from those that were based on continuous measurements.

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