期刊
CLEAN-SOIL AIR WATER
卷 44, 期 7, 页码 766-774出版社
WILEY
DOI: 10.1002/clen.201400785
关键词
Fertilizer nitrogen; Greenhouse gas mitigation; Net economic benefit; Nitrous oxide emission
类别
资金
- National Natural Science Foundation of China [31201686]
- National Science Technology Program [2012BAD15B03]
- Jiangsu Agriculture Science and Technology Innovation Fund (JASTIF) [CX(14)2050]
Greenhouse gas emissions from vegetable production systems contribute to climate change, but the impact of nitrogen (N) rates and crop rotation on global warming potential (GWP) is not well documented. A field experiment was conducted to estimate the sum of GWP (mGWP) and yield-scaled GWP in an intensive vegetable cropping system. The study included the traditional rotation of celery-tomato-lettuce (Rt) and the modified rotation of bur clover-tomato-lettuce (Rm), and each with four fertilizer N options (control, manure-N, optimum, and conventional N). The nitrous oxide emission rates were 6.87 and 10.24 kg N ha(-1), and the mGWP values were 27.9 and 31.8 MgCO2-eq ha(-1) per year from the optimum and conventional N plots under the traditional rotation, respectively. The change from the traditional to modified rotation reduced N input by 25%, N2O emissions by 24%, and mGWP by 14% but increased the net economic benefit by 33% under the optimized N application rate in the intensive vegetable cropping system. The trends of yield-scaled GWP from different N rates and vegetable crop rotations were similar to the mGWP. This study proved that optimizing vegetable crop rotation by including legumes and adjusting N application rates simultaneously can reduce global warming potential while maintaining agricultural economic benefit.
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