基于净初级生产力的省公顷生态足迹模型参数的计算——以江苏省为例

Calculation of Ecological Footprint Model Coefficients Based on Net Primary Productivity:A Case Study of Jiangsu

基于传统生态足迹模型,在省域空间尺度下构建了"省公顷"生态足迹模型,基于植被净初级生产力(NPP),对生态足迹的均衡因子和产量因子加以本地化改进,并改进了化石能源土地的计算方法。以江苏省为例,根据省公顷模型参数的计算形式,采用该区域2000-2010年间MOD17A3遥感数据的年NPP以及土地利用数据,计算了不同年份江苏省各类生物生产性土地的均衡因子和13个地市各类土地的产量因子。结果表明,江苏省各类土地的均衡因子与全球或国家公顷的均衡因子差异显著,各地市的产量因子也存在一定差异,但总体更为符合区域实际情况。基于NPP的省公顷模型使得动态均衡因子和产量因子的计算快速简便,适用于省、市域等中小尺度区域可持续发展生态评估。

A provincial hectares ecological footprint（EF）model was built in this study based on traditional EF model at provincial scale.Using vegetation net primary productivity（NPP）as the basis for the proposed model,the equivalence factors and yield factors of all types of biologically productive land in EF analysis were calculated for standardization and localization.Moreover,modified methods of the fossil energy land were proposed.Using the case study of Jiangsu Province,application of the methods in the provincial hectares EF model,the coefficients were calculated using MOD17A3 remote sensing products and land use data in 2000,2005,2008,and 2010 in Jiangsu.Firstly,the equivalence factors of all types of productive land were calculated.Then,the equivalence factors of the provincial hectares EF model were compared with results of the global hectares EF model and the national hectares EF model.The results revealed that these equivalence factors differ significantly.Each method had its own advantages and disadvantages,but the results of the Jiangsu provincial hectares EF model were closer to reality.Secondly,the yield factors of cropland,forest,pasture,fisheries of 13 cities at prefectural level in Jiangsu were calculated in 2000,2005,and 2010.There were great disparities between the yield factors of different cities.Finally,it can be concluded that the provincial hectares EF model not only improves the accuracy of results of ecological footprint of cities,but also make it easy to contrast EF results of some cities or counties with others in the same province.The provincial hectares EF model is fit for the ecological assessment of provincial and sub-provincial area.