三峡库区典型粮菜轮作系统施肥管理及环境代价评价

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Abstract This study assessed the current status of fertilization management and its environmental cost for two typical grain-vegetable rotation systems in Three Gorges Reservoir area, which can further provide a scientific and reasonable basis for the green and sustainable development of regional crop rotation systems. A total of 175 farmers in Fuling District of Three Gorges Reservoir area were randomly selected to conduct a survey about the current situation of fertilization management. Two typical grain-vegetable rotation systems including mustard-maize and mustard-rice were compared in term of productivity, fertilizer type and rate, environmental cost and economic benefit. In addition, a scenario analysis was performed to evaluate the effects of optimized fertilization and use of new fertilizer types on reducing environmental costs. Results showed no significant difference in productivity between the two grain-vegetable rotation systems. The total amount of fertilization in the mustard-maize rotation system was 68.4% higher than that in the mustard-rice rotation system. Specifically, the amounts of nitrogen, phosphorus and potassium fertilizers in the maize growing season were 305kg/hm², 92.3kg/hm² and 66.6kg/hm², which were greater than those in the rice growing season. During fertilization process, reactive nitrogen loss, acidification potential and eutrophication potential based on 1000-Yuan profit were 147%, 73.1% and 146%, respectively, greater for the mustard-maize rotation than for the mustard-rice rotation. In contrast global warming potential was 38.9% less for the former. Reactive nitrogen loss, acidification potential and eutrophication potential based on per hectare were 44.6%, 27.1% and 44.1%, respectively, greater for the mustard-maize rotation than for the mustard-rice rotation system, whereas global warming potential was 33.3% less for the former. Results of scenario analysis indicated that optimization of fertilizer application could significantly reduce environmental cost. Optimal fertilization strategy with addition of nitrification inhibitors could further reduce reactive nitrogen loss, global warming potential and eutrophication potential of whole rotation system. This study provides theoretical support for the development of source reduction technology to prevent and control non-point source pollution.

Key words： grain-vegetable rotation fertilization management environmental cost scenario analysis Three Gorges Reservoir area

Received: 20 July 2020

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	WU Qiu-fu
	WANG Xiao-zhong
	CHEN Xin-ping
	LIU Dun-yi

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WU Qiu-fu,WANG Xiao-zhong,CHEN Xin-ping等. Fertilization and environmental cost assessment of typical grain-vegetable rotation systems in the Three Gorges Reservoir area[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(3): 1272-1281.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I3/1272

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