emergyanalysisofgrainproductionsysteminjiangsuandshaanxiprovinces

	emergyanalysisofgrainproductionsysteminjiangsuandshaanxiprovinces
	Liu Xinwei 2; Chen Baimin 2; Zhang Dingxiang 1
刊名	chinesegeographicalscience
	2004
卷号	14 期号:3 页码:209
ISSN号	1002-0063
英文摘要	Efficiency and sustainability of grain production are now important in China. In this study, the grain production systems of Jiangsu and Shaanxi Provinces were compared, to analyze their efficiency and sustainability in terms of utilization of natural resources, inputs of purchased energy and materials, and outputs. Flows of energy and materials between environment and human society were identified, and the natural and human work involved in generating inputs as materials or energy were valued in terms of equivalent amount of solar energy required for their production using emergy method. The results showed environmental resources were continually playing a less important role in the systems, when inorganic subsidiary emergy inputs increased drastically while organic ones decreased or increased little. Deterioration of input emergy structure affected the systems' efficiency and sustainability, resulting in emergy investment ratios and environmental loading ratios increasing while yield ratios and sustainability indices decreasing. In general, efficiency and sustainability of grain production in Jiangsu are worse than those in Shaanxi. This analysis also suggested that inorganic subsidiary emergy should be introduced properly, and peasants in Jiangsu should utilize natural conditions wisely while those in Shaanxi pay enough attention to soil and surface water conservation.
资助项目	[Knowledge Innovation Project of Chinese Academy of Sciences]
语种	英语
内容类型	期刊论文
源URL	[http://ir.igsnrr.ac.cn/handle/311030/108896]
专题	中国科学院地理科学与资源研究所
作者单位	1.China Institute of Land and Surveying, Ministry of Land and Resources 2.中国科学院地理科学与资源研究所
推荐引用方式 GB/T 7714	Liu Xinwei,Chen Baimin,Zhang Dingxiang. emergyanalysisofgrainproductionsysteminjiangsuandshaanxiprovinces[J]. chinesegeographicalscience,2004,14(3):209.
APA	Liu Xinwei,Chen Baimin,&Zhang Dingxiang.(2004).emergyanalysisofgrainproductionsysteminjiangsuandshaanxiprovinces.chinesegeographicalscience,14(3),209.
MLA	Liu Xinwei,et al."emergyanalysisofgrainproductionsysteminjiangsuandshaanxiprovinces".chinesegeographicalscience 14.3(2004):209.