滴灌施肥对设施菜地N<sub>2</sub>O排放的影响及减排贡献

江雨倩; 李虎; 王艳丽; 张婧; 孙媛; 王立刚; 黄诚诚; 张建峰

Effects of fertigation on N₂O emissions and their mitigation in greenhouse vegetable fields

Received:January 22, 2016

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KeyWord:fertigation;greenhouse vegetable;N₂O emission;mitigation contribution;water and fertilizer utilization

Author Name	Affiliation	E-mail
JIANG Yu-qian	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
LI Hu	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China	lihu0728@sina.com
WANG Yan-li	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
ZHANG Jing	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
SUN Yuan	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
WANG Li-gang	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
HUANG Cheng-cheng	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China
ZHANG Jian-feng	Key Laboratory of Non-point Source Pollution Control, Ministry of Agriculture CAAS-UNH Joint Laboratory for Sustainable Agro-ecosystem Research Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China

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Abstract:

In this paper, four treatments, i.e. control(CK), farmers' practice(FP), farmers' practice with drip irrigation(FPD), and optimal fertilization with drip irrigation(OPTD), were conducted in the suburbs of Beijing. FPD consisted of drip irrigation with fertilizers dissolved in the irrigation water. OPTD had the same fertigation but N fertilizer was reduced by 40%. Soil N₂O fluxes were measured year round by static chambers. Soil temperature, moisture, and nitrate levels were monitored in parallel with N₂O measurements for all plots. Finally, the effects of fertigation on water and fertilizer use efficiency and soil N₂O emissions in this system were analyzed. Results indicated that the N₂O emission fluxes in the treatments ranged from -2.67 mg N·m^-2·h^-1 to 22.56 mg N·m^-2·h^-1. Fertilization and irrigation were the major factors inducing N₂O emission peaks for a certain time. The N₂O emission peaks lasted for 10 days after basic fertilization, and for 3 to 5 days after additional fertilization. The fertigation management reduced N₂O emission peaks and lasting time. Soil temperature was a significant factor affecting the N₂O emissions in cucumber season. Compared with the FP treatment, FPD and OPTD reduced the annual N₂O emissions by 29.41% and 32.63%, whereas FPD treatment increased the nitrogen partial productivity and irrigation water use efficiency by 14.62% and 43.54%, respectively. It is concluded that the fertigation management practice could not only increase water and fertilizer use efficiency, but also reduce N₂O emissions while maintaining or increasing crop yields from the greenhouse vegetable system.