基于能值理论的湖南环洞庭湖区域农业产出研究

为了研究湖南环洞庭湖区域的农业生态经济系统的产出效率。本研究利用能值理论研究了2001—2010年期间该区域的农业产出情况。结果表明：该区域农业能值产出增长了44.68%，达到了6.50E+22 sej，但是低于非农产业产出增长速度。与2001年相比，2010年农业内部主要表现为种植业能值产出4.10E+22 sej，占总能值产出比为63.09%，提高了2.93个百分点，而畜牧业则下降了2.87个百分点；渔业无论是能值总量还是所占比例都位居增幅第二，但其增幅不符合洞庭湖区域特征；农业能值产出集中度高，谷物、油料、猪肉和水产品占比之和超过90%。从农业能值产出与经济产出对比看，种植业和渔业的经济回报率低于林业和畜牧业，且前两者仍处于收益率下降态势，而后两者则呈现收益率上升趋势。这说明湖南环洞庭湖区传统优势产业种植业和渔业的经济效益有待提高。

Study on the Agricultural Output of Dongting Rim in Hunan Province Based on the Theory of Emergy

To analyze the efficiency of the agro-ecosystem of Dongting Rim in Hunan Province, this paper adopted the emergy theory to study the agricultural output of this region during 2001 to 2010. The results showed that the value of regional agricultural emergy output increased by 44.68% to 6.50 E+22 sej, but lower than the growth of non-agricultural industry output. Compared with 2001, the emergy output of planting industry was 4.10E+22 sej in 2010 which occupied 63.09% of the total agricultural emergy output and got an increase of 2.93 percentage points, while the emergy output of stock farming got a decrease of 2.87 percentage points. The growth of fishery emergy output was not in conformity with the characteristics of Dongting Rim in Hunan. From the contrast between emergy output and economic output, we could fond that the economic return ratio of planting industry and fishery industry were lower than those of forestry industry and stock farming industry, which indicated that it’s necessary to improve the economic benefits of planting industry and fishery .industry which were the traditional industries with advantages of the Dongting Rim in Hunan.