不同政策情景下荒漠化地区土地耕作适宜性评价

Suitability evaluation of land cultivation in desertification region with different policies

针对目前耕地适宜性评价中存在指标缺乏表达农民意愿及生态限制性因子的缺陷,应用基于生态限制性因子指标体系开展了中国荒漠化地区土地耕作适宜性评价。结果表明:在粮食安全政策导向情景下,荒漠化地区土地耕作适宜性较高的地区集中分布在亚湿润干旱区及半干旱区的局部地区,占地37×104km2;在生态环境政策导向下,荒漠化地区土地耕作适宜性较高的地区集中分布在内蒙古南部、西藏南部、新疆北部的局部地区,占地约26.9×104km2;由于政策导向的不同,宜耕减少地区主要集中于内蒙古东部和西藏南部的局部地区。该研究为大空间尺度土地耕作适宜性评价及多指标、尤其是生态限制指标的实用及不同情景的设置进行了积极的探索。

In order to make up for the lack of evaluation index system of land cultivation suitability for expressing farmers＇ inclination and ecological limiting factors,the land cultivation suitability evaluation for the desertification regions of China was implemented by applying index system based on ecological restriction factors.The results showed that：with policy scenario of food security,the areas with high-level suitability for land cultivation concentrated on the part of the sub-humid and semi-arid areas with the total area of about 37×10^4 km^2.With policy scenario of ecology and environmental protection,the areas with high-level land suitability for cultivation concentrated on the South Inner Mongolia,the South Tibet and the North Xinjiang Municipality with the total area of about 26.9×10^4 km^2.Since the setting of the different policy scenarios,the reduction regions of high-level land suitability spatially distributed in the eastern parts of the Inner Mongolia and the southern parts of Tibet.This study explored the method for land suitability at large scale and multi-index system,especially application of ecological limiting factors with different policies.