Wang Shu-Yu, Bian Xin-Min
Department of Environmental Economics, Shanxi University of Finance and Economics, Taiyuan 030006, China.
Ying Yong Sheng Tai Xue Bao. 2007 Sep;18(9):1977-81.
The Wackernagel's method of ecological footprint assumes that arable lands are cropped only once a year in a country or a region, which does not accord with the conception of ecological footprint referring to the area of productive land. In this paper, the method of cropland footprint was modified by regulating with multi-cropping index, and the ecological footprint calculated with the new method was for the area of cropland but not that of multi-cropping. The ecological economic systems in Binhai and Funing counties of Jiangsu Province from 1995 to 2003 were analyzed by the modified method, and the results showed that when calculated with conventional Wackernagel's method, the ecological footprints of Binhai and Funing were from 1.79 hm2 to 2.22 hm2 and from 1.38 hm2 to 2.81 hm2, and the percentages of cropland ecological footprint in total ecological footprints decreased from 42.65% to 38.81% and from 45.73% to 38.85%, respectively, while calculated with the modified method, the ecological footprints and the percentage of cropland ecological footprint in total ecological footprints were from 1.43 hm2 to 1.88 hm2 and from 1.12 hm2 to 2.43 hm2, and decreased from 28.45% to 22.89% and from 32.94% to 29.42%, respectively. It was indicated that the ecological footprint calculated with the new method was for the area of cropland, which more accorded with the eco-capacity and changed the size and composition of ecological footprints, being able to reflect the use of natural resources more precisely.
瓦克纳格尔生态足迹法假定一个国家或地区的耕地每年仅种植一季作物，这与生态足迹中关于生产性土地面积的概念不符。本文通过引入复种指数对耕地足迹法进行修正，修正后计算得到的生态足迹是实际耕地面积而非复种面积。运用修正后的方法分析了江苏省滨海县和阜宁县1995—2003年的生态经济系统，结果表明：采用传统的瓦克纳格尔法计算，滨海县和阜宁县的生态足迹分别为1.79 hm²至2.22 hm²和1.38 hm²至2.81 hm²，耕地生态足迹占总生态足迹的比例分别从42.65%降至38.81%和从45.73%降至38.85%；采用修正后的方法计算，生态足迹分别为1.43 hm²至1.88 hm²和1.12 hm²至2.43 hm²，耕地生态足迹占总生态足迹的比例分别从28.45%降至22.89%和从32.94%降至29.42%。结果表明，修正后的方法计算得到的生态足迹是实际耕地面积，更符合生态承载力，改变了生态足迹的大小和构成，能更准确地反映自然资源的利用情况。
