甘肃省土地利用变化及其对生态服务功能的影响

Land Use Change and Influence to Ecological Service in Gansu Province

根据1980、1995、2000年甘肃省土地利用数据,采用土地利用变化贡献率、动态度、斑块个数、多样性指数、优势度指数、均匀度指数等指标,研究甘肃省土地利用时空变化情况;并根据我国陆地生态系统生态服务价值当量因子表,对由土地利用变化引起的甘肃省生态服务价值进行定量评估和分析,确定不同时段的土地利用结构变化引起的生态服务价值响应与变化特征。结果表明,1980～2000年甘肃土地利用变化总体表现为耕地、建筑面积呈增加趋势,其他土地利用类型均呈减少趋势;同期各生态系统类型服务价值均呈增长趋势,从总体变化特征看,基本与土地利用变化情况一致。

Land use change and statistical data in 1980,1995 and 2000 were used to investigate land use change process and the influence to ecological service in Gansu Province.Contribution ratio,dynamic degree,patch number,diversity,dominance and fragmentation were used to study land use pattern and land use change process.To evaluate ecological service quantitatively,the equivalent factor on ecological service of terrestrial ecological system was adopted to study structural change as well as the ecological service change at 1980,1995 and 2000 in Gansu Province.Results show that：farmland and built-up land expanded,whilst forestry,Grasslands,Water area Barren land reduced from 1980 to 2000;at the same time ecological service increased,which showed the same tendency both on land use change and ecological service.