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Emergy analysis of agroecosystems in Shandong Province of China.

WANG Jian-yuan; XUE De-qiang; TIAN Xiao-ping; CHEN Yan-chun   

  1. Climate Center of Shandong Province, Jinan 250031, China
  • Received:2006-06-06 Revised:1900-01-01 Online:2007-05-08 Published:2007-05-08

Abstract: In this paper, the emergy input and output, environmental loading, and running effect of agroecosystems in Shandong Province were quantitatively analyzed, aimed to better evaluate the agricultural utilization of solar energy resources and the sustainable development of agriculture in this province. The results showed that in emergy input, the contribution of freely used environmental emergy, unrenewable industrial emergy, and renewable organic emergy was 21.0%, 54.5% and 24.5%, respectively. The net emergy yield rate was 5.31, environmental loading was 6.42, emergy density was 7.22×1011 sej·m-2, and the sustainability index based on emergy analysis was 1.52. The agroecosystems in Shandong Province had higher efficiency of emergy output and better effect of running, but were still at the stage of petroleum agriculture, which should be paid great attention to. To promote the sustainable development of agriculture in this province, the investment proportion of fossil energy should be reduced gradually, and the research and extension of agricultural science and technology should be strengthened.

Key words: Soil nutrient, Spatial variability, Geostatistics, Kriging