文献类型： 外文期刊

作者： Li, Y. K. ¹ ; Li, B. ¹ ; Guo, W. Z. ¹ ; Wu, X. P. ² ;

作者机构： 1.Beijing Acad Agr & Forestry Sci, Beijing Res Ctr Intelligent Equipment Agr, Beijing 100097, Peoples R China

2.Chinese Acad Agr Sci, Inst Agr Resource & Reg Planning, Beijing 100081, Peoples R China

关键词： Cucumber;Environmental factor;Nitrogen fertilizer;N2O flux. Soil NO3-N

期刊名称：JOURNAL OF AGRICULTURAL SCIENCE AND TECHNOLOGY （ 影响因子：1.098； 五年影响因子：1.348 ）

ISSN： 1680-7073

年卷期： 2015 年 17 卷 2 期

页码：

收录情况： SCI

摘要： Nitrous oxide (N2O) has significant impact on global warming and leads to the depletion of ozone in the stratosphere. Agricultural soil is regarded as a major source of N2O emissions. In recent years, greenhouse grown vegetables have rapidly developed in China. Although excessive fertilizer application in greenhouse vegetable production can result in increased N2O emissions, research data on such emissions from greenhouse vegetables, such as cucumber, remains limited. In this study, four nitrogen (N) fertilizer treatments including 1,200 (N-1200, traditional N amount), 900 (N-900), and 600 kg N ha(-1) (N-600) and the control (N-0) were carried out on cucumber in a greenhouse in the North China Plain. Results showed that N2O emissions mainly occurred in the first five days after topdressing, and accounted for 75.8%-95.2% of total N2O emissions produced in the whole interval (10 days). Significant exponential correlations were observed between N2O flux and nitrification or denitrification rates (P<0.01). The results also indicated that nitrification dominated and played a more important role in N2O emissions than denitrification under the irrigation conditions of the study (water-filled pore space was 40.0 to 66.6%). Cumulative N2O emissions were 0.48-5.01 kg N ha(-1) in the cucumber growing season, accounting for 0.28-0.38% of nitrogen input. Compared to N-1200, treatment N-600 significantly reduced the rate of N2O emissions by 53.4%, and also maintained cucumber yield. Based on this study, 50% of the traditional N fertilizer rate (N-600) was considered sustainable for greenhouse cucumber production in the North China Plain.