基于GIS的耕地边际化评价与转移的生态价值评估——以三峡库区涪陵段为例

A GIS-Based Estimate of Farmland Marginalization and Evaluation of Ecosystem Service Value after Transfer——A Case Study in Fuling District in the Three-Gorges Reservoir Area

采用联系度改进的TOPSIS法、邻域评估、极限条件和综合指数模型相结合的方法,对研究区耕地边际化进行预测并探讨转移方向,对转移结果进行生态价值评估,研究表明:(1)海拔、坡度、起伏度、灌溉距离、交通距离和耕作距离(水平距离和垂直距离)对耕地完全边际化影响较大;(2)研究区共有21 455.78hm2耕地可能发生转移,其中林地9 519.73hm2,园地47.01hm2,草地11 889.04hm2;且转移后生态系统服务总价值比转移前上涨17.09千万元.

Farmland marginalization in mountainous regions has a serious effect on food security and ecological security.The improved TOPSIS method based on connection degree,neighborhood analysis,limit conditions and comprehensive index model are used in combination to predicate the complete marginalization of farmland and evaluate the transfer direction of the completely marginalized of farmland in the study area,and the ecological service value coefficient of Xie is used to evaluate the ecosystem service value.The results indicated that elevation,slope,relief,irrigation distance,transportation distance and farming distance(horizontal and vertical distance)had a noticeable influence on complete marginalization of farmland and that in the study area,a total of 21 455.78 ha of completely marginalized farmland may be transferred,of which 9 519.73 ha are suitable for forest land,47.01 ha are suitable for garden land,and 11 889.04 ha suitable for grass land.After land transfer,the total value of the marginalized farmland would increase by170.90 million yuan(RMB).