以云南省永胜县为例,应用景观生态学原理,构建土地持续利用的时空耦合的综合评价指标体系,定量评价全县1996年、1999年和2001年间的土地利用可持续性动态,并构建指标贡献度与指标障碍度,定量表征各指标的相对作用强度。研究结果表明,研究时段内全县各乡镇土地利用可持续性整体均较低,相对差异大而稳定;区域土地利用系统在1999年前后发生了较大变化,偏离了土地持续利用目标;对全县各乡镇土地利用可持续性起重要贡献作用的因素主要是人口密度与土地利用程度指数,景观多样性与复种指数次之;主要障碍因素则是地均工农业总产值、粮食作物单产、景观破碎度,油料作物单产、单位面积耕地化肥使用量次之。

As an important content of the research on global environmental change,the(focus) of the study on land use/land cover change(LUCC) has been transferred from the spatial pattern analysis to the effects evaluation of LUCC on the environment.As the evaluation for land use sustainability belongs to the research on the functional assessment of land use pattern change,the evaluation for land use sustainability is thus an important way in the transformation of LUCC research from spatial pattern analysis to ecological function evaluation. The sustainability of land use is not only the sustainability of land use mode in temporal scale,but also includes the spatial optimization in spatial scale.Taking spatial heterogeneity and ecological holism as its theoretical foundation,landscape ecology has great power in the evaluation for spatial pattern.Therefore,the application of the theories of landscape ecology into the evaluation for sustainable land use is of a great help to the evaluation for sustainable land use in temporal and spatial scales.It is a new field of the research on the evaluation for sustainable land use. Taking Yongsheng county of Yunnan province as a case,we constructed a synthetic(evaluating) index system for land use sustainability,by applying principles of landscape ecology,to make a quantitative evaluation for the dynamics of land use sustainability of the county in 1996,1999 and 2001.We also made two indexes,that is,contributing amount of indexes and obstacle amount of indexes, to make certain the comparative intensity of all the evaluation indexes.The results showed that,in the past 5 years,land use sustainability of all the 18 towns of Yongsheng county are relatively low,with a stable and great spatial difference.And there was a great change in regional land use system in 1999,which made a departure from the aim of sustainable land use.The results also showed that,in all the 18 towns,on one hand,the most important indexes contributing to land use sustainability are the indexes of population density,land use degree,landscape diversity,and multiple cropping.On the other hand,the most important indexes counteracting land use sustainability are the indexes of per unit area total output value of industry and agriculture,per unit area yield of cereal crops,and landscape fragmentation,per unit area yield of economic crops,and per unit area agricultural fertilizer.