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	Emergy Assessment of a Wheat-Maize Rotation System with Different Water Assignments in the North China Plain
	Hu S. ; Mo X. G. ; Lin Z. H. ; Qiu J. X.
	2010
关键词	Emergy analysis Groundwater Irrigation VIP model North China Plain winter-wheat energy analysis evapotranspiration sustainability information region brazil farms
英文摘要	Sustainable water use is seriously compromised in the North China Plain (NCP) due to the huge water requirements of agriculture, the largest use of water resources. An integrated approach which combines the ecosystem model with emergy analysis is presented to determine the optimum quantity of irrigation for sustainable development in irrigated cropping systems. Since the traditional emergy method pays little attention to the dynamic interaction among components of the ecological system and dynamic emergy accounting is in its infancy, it is hard to evaluate the cropping system in hypothetical situations or in response to specific changes. In order to solve this problem, an ecosystem model (Vegetation Interface Processes (VIP) model) is introduced for emergy analysis to describe the production processes. Some raw data, collected by investigating or observing in conventional emergy analysis, may be calculated by the VIP model in the new approach. To demonstrate the advantage of this new approach, we use it to assess the wheat-maize rotation cropping system at different irrigation levels and derive the optimum quantity of irrigation according to the index of ecosystem sustainable development in NCP. The results show, the optimum quantity of irrigation in this region should be 240-330 mm per year in the wheat system and no irrigation in the maize system, because with this quantity of irrigation the rotation crop system reveals: best efficiency in energy transformation (transformity = 6.05E + 4 sej/J); highest sustainability (renewability = 25%); lowest environmental impact (environmental loading ratio = 3.5) and the greatest sustainability index (Emergy Sustainability Index = 0.47) compared with the system in other irrigation amounts. This study demonstrates that application of the new approach is broader than the conventional emergy analysis and the new approach is helpful in optimizing resources allocation, resource-savings and maintaining agricultural sustainability.
出处	Environmental Management
卷	46
期	4
页	643-657
收录类别	SCI
语种	英语
ISSN号	0364-152X
内容类型	SCI/SSCI论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/23853]
专题	地理科学与资源研究所_历年回溯文献
推荐引用方式 GB/T 7714	Hu S.,Mo X. G.,Lin Z. H.,et al. Emergy Assessment of a Wheat-Maize Rotation System with Different Water Assignments in the North China Plain. 2010.

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