中文摘要：

以江苏省耕地生态足迹为研究对象，在考虑不同地区的土地利用效率的基础上，把太阳辐射、降水量、土壤肥力、土地利用效率、耕地面积等作为构成承载力的实质因素，计算了江苏省不同地区的耕地生态承载力。研究结果表明：就人均耕地生态承载力而言，苏北地区普遍大于苏中和苏南地区，盐城市、淮安市和宿迁市最大，无锡市、南京市和苏州市最小。就人均耕地生态足迹而言．苏南地区普遍小于苏北和苏中地区，盐城市、南通市和淮安市最大．而无锡市、苏州市和常州市最小。江苏省13个地市的生态差额指数都小于0．5，即耕地都处于不可持续性状态，其区域差异是：南北两端好于中部，南端的苏州市、无锡市最好；而江苏中部，又是中间好于东西两侧，东侧的南通市、盐城市最差。

英文摘要：

Some scholars have calculated ecological footprint using the theory of emergy analysis. But there are some drawbacks in their studies. This paper singles out the ecological footprint of cropland from 6 types of land use as study topic focusing on the regional differences in Jiangsu province, revises the ecological carrying capacity with productivity factor because land use efficiencies vary across regions, and uses ecological gap index （EGI） in place of ecological deficit or remainder to evaluate the ecological sustainability. In the research of ecological carrying capacity of cropland, the solar radiation, precipitation, soil fertility, the efficiency of land use and area of cropland are considered as natures of ecological carrying capacity, and a new concept of ＂standard area＂ is established in terms of the quality class of cropland. In Jiangsu province, ecological carrying capacity of cropland in northern region is more than that in the middle and southern regions, that is, Yancheng, Huaian and Suqian have the highest ones while those Wuxi, Nanjing and Suzhou are the lowest. Ecological footprint of cropland in southern region is less than that in the middle and northern regions, that is, Yancheng, Nantong and Huaian have the greatest ones while those Wuxi, Suzhou and Changzhou are the least. Ecological gap indexes of cropland of all 13 regions in Jiangsu are all lower than 0.5, which means croplands usees are unsustainable. Cropland＇ s EGI in the middle part is lower compared with southern and northern parts, and the midst is better than the eastern and western districts in Jiangsu＇s middle part. Suzhou and Wuxi have the highest EGI, and that Nantong and Yancheng have the lowest EGI. The results can be helpful for integrating the theory of emergy analysis to the conventional model of ecological footprint and for sustainable use of cropland in this province.