基于区域绿当量变化的土地利用优化设计——以重庆市璧山县为例

Optimization design in land usage based on regional change of green equivalence——A case study of Bishan County,Chongqing

土地利用类型受人为活动和自然环境变化的影响,在时空尺度上快速变化。土地利用的变化影响生态系统的稳定性和服务能力,直接影响人类的生活。对土地利用变化的生态评估一直受到学者的关注。以生态绿当量变化为参考,分析璧山县土地利用变化对生态服务功能的影响。结果显示,璧山县境内城镇面积逐渐增加,对绿当量贡献最大的林地面积在不断增加,但是草地和耕地面积在减少,总体的绿当量呈现下降趋势,说明生态服务功能降低,人均占有生态绿当量也在下降。建议通过利用境内有效水系来建设生态湿地,丰富植被类型,增加绿地面积和生态绿当量等优化措施,以此提高生态环境的生态服务功能。

Land-use type is affected by the change of human activities and natural environment,and has been rapidly changed in space and time scale.The changes of Land-usage affect the stability of ecological system and service ability and finally exert direct impact on human life.The evaluation of the change in ecological land usage has been attracting the attention of scholars.In the present paper,we take the ecological green equivalent change as an indicator to analyze the effect of landuse change inBishan county on ecosystem service functions.The results show that the urban area is gradually increasing in Bishan county,and the largest woodland area contributing to green equivalence is also increased,but the grassland and arable land areas are decreased.Therefore,the overall green equivalence showed a downward trend,which indicates the reduction of ecological service function and the descent of the per capita share of green equivalent.We suggested in this paper that by utilizing the effective drainagein the region to construct ecological wetland,enrich vegetation types and increase the green area.The ecological optimizationcan improve the ecological environment of ecological service function.