Based on the connotation defining of the efficiency and sustainability of cultivated lands, the author built an index system for efficient and sustainable cultivated land use evaluation, gave a system analysis evaluation of the cultivated land eco-economic system in the coastal region of Jiangsu Province using the theory of emergy analysis provided by H. T. Odum. The results showed that: 1) Emergy-based resource and environmental loading index of cultivated lands(A1)was on the rise from 0.9 to 1.573 in 9 years(2000-2008). In the temporal sequence, the stability of the input subsystem was strong, but that of the output subsystem was weak. 2) Cultivated land eco-economic system of the coastal region in Jiangsu Province was cost-efficient, the degree of land use intensity(B1)was increasing every year. But the input emergy structure of productive factors was unreasonable, and the input of productive factors was intensive but not economical. What’s more, the difference index of the input emergy structure became increasingly great. It presented that the degree of land use intensity(B1)was 1.85×1016 sej/hm2 and the proportion of both non-renewable resources and non-renewable industrial assistant emergy in the input emergy structure accounted for 61.13% in 2008, which had significantly increased compared with 2000. But the output-input ratio based on emergy(B2) was 1.0364 in 2008, fell by 15.90% compared with 2000, which presented a declining trend. 3) The emergy per farmer was increasing year by year from 2000 to 2008. In 2008, the emergy per farmer had reached 1.08×1016 sej, increased by 92.81%, nearly doubled from 2000 to 2008. This indicated that the living index of farmer(C1)had greatly improved. But the growth rate of the emergy per farmer year on year was unstable. The output of emergy density of the coastal region in Jiangsu Province presented an inverted "V" shape on the whole from 2000 to 2008. There was slowly declining trend obviously since 2005, which means that the problem of grain security is very serious.
XU Hui, HUANG Xian-jin, ZHAO Rong-qin, GAO Shan
. Study on the Emergy Analysis and Efficiency and Sustainability Evaluation of the Coastal Region Cultivated Land System in Jiangsu Province[J]. JOURNAL OF NATURAL RESOURCES, 2011
, 26(2)
: 247
-257
.
DOI: 10.11849/zrzyxb.2011.02.008
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