Analysis of N2O Emissions from Greenhouse Soil Under Different Irrigation Water and Nitrogen Conditions

文献类型： 外文期刊

第一作者： Li, Yin-Kun

作者： Li, Yin-Kun;Wang, Li-Chun;Duan, Min-Jie

作者机构：

关键词： Greenhouse Cucumber;Nitrogen Fertilizer;Irrigation Water;N2O Emissions

期刊名称：INTERNATIONAL CONFERENCE ON ENERGY AND ENVIRONMENT ENGINEERING (ICEEE 2015)

ISSN：

年卷期： 2015 年

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收录情况： SCI

摘要： Greenhouse cucumber is one of the most popular crops in the North China Plain, and this highly productive crop is an important source of nitrous oxide (N2O) emissions due to the high fertilizer nitrogen and irrigation water inputs. However, a few researchers have reported on N2O emissions from greenhouse cucumber fields. In this study, six treatments including two irrigation levels (traditional, 747 mm (W1); 70% of the traditional irrigation water, 519 mm (W2)) and three N rates treatments (traditional, 1,200 kg N ha(-1) (N2); 75% of the traditional nitrogen, 900 kg N ha(-1) (N1); and no nitrogen input (N0)), were carried out on cucumber in greenhouses in the northern China plains. Results showed that the appropriate reduction of irrigation water and nitrogen fertilizer could significantly reduce the N2O emissions. Compared with W1N2, the N2O emission peak of W2N1 was decreased by 45%-115% after nitrogen fertilizer application. The N2O fluxes were increased exponentially with the soil nitrate nitrogen content and WFPS increasing, but the effects of soil moisture on N2O flux was probably masked by the effects of fertilizer. Cumulative N2O emissions were ranged from 0.48 to 7.92 kg ha(-1) during the cucumber growing season, and 0.28%-0.60% (average 0.42%) of the nitrogen application rate was emitted as N2O-N. The improved management measures which have reduced the irrigation amount and nitrogen fertilizer rate by 30% and 25% respectively could make the N2O emissions decreased by 62.0% (P < 0.01) without the cost of cucumber yield. From this study, 70% of the traditional irrigation water and 75% of the traditional N fertilizer rate (W2N1) were considered as the sustainable combination for greenhouse cucumber in the North China plain.

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