将耕地重金属污染引入耕地生态足迹研究中,对传统耕地生态承载力模型进行了改进,并以江苏省为例进行实证研究.结果表明,运用改进的生态承载力模型计算所得2005年江苏省人均耕地生态承载力为0.127 hm2,比传统模型计算结果0.134 hm2小;人均耕地生态赤字为0.067 hm2,比传统模型计算结果0.060 hm2大;耕地生态可持续指数为0.39,比传统模型计算结果0.41小,但2种模型计算方式下耕地利用均属于弱不可持续状态.与传统模型计算结果相比,改进模型所得结果能够反映江苏省耕地利用的实际情况,以及重金属污染对江苏耕地可持续利用所产生的负面影响.%Modification is made of the traditional model of ecological carrying capacity of cropland through introducing the factor of cropland heavy metal pollution into the study of the ecological footprint theory,with Jiangsu Province set as an example in case study.Results show that by using the modified model the ecological carrying capacity of cropland in Jiangsu in 2005 was calculated to be 0.127 hm2 per capita,5.2% lower than 0.134 hm2 per capita calculated by using the traditional model;the cropland ecological deficit 0.067 hm2 per capita,11.7% higher than 0.060 hm2 per capita calculated by using traditional model;and the cropland ecological sustainability index 0.39,lower than 0.41 calculated by using traditional model.Although the results of the calculation using both models put the cropland of Jiangsu under the category of "weak unsustainability",the modified model more truly reflected the practical situation of the land use,and the negative impact of heavy metal pollution on ecological carrying capacity of the cropland in Jiangsu Province as well.
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