基于GIS的四川岷江上游杂谷脑流域农林复合景观格局优化

随着景观格局、生态过程与生态功能关系研究的深入，景观格局优化成为景观生态学研究中的前沿问题。景观格局优化的方法和判别准则随研究区的特点而异，从方法上进行景观格局优化探讨，在遥感和地理信息系统技术支持下建立了包括景观分类图(1974和2000年)、温度、降雨、地形图、土壤类型图等数据的空间数据库，利用地理信息系统强大的空间数据管理和空间分析与运算能力，以土地综合利用和土壤侵蚀为判别准则，引入了潜在土壤侵蚀强度这一概念，在地理信息系统环境中运用空间模拟和土地利用优先级规定，对岷江上游杂谷脑流域进行景观优化。结果显示优化后的景观格局显著改善土壤侵蚀问题

SPATIAL OPTIMIZATION OF AGRO-FOREST COMPLEX LANDSCAPE PATTERN IN ZAGUNAO WATERSHED, UPPER MINGJIANG RIVER,SICHUAN

Along with the intensive study of the relation between landscape pattern,ecological process and function,spatially optimizing the landscape pattern is coming to be one of the frontier issues in the area of landscape ecology.Unfortunately,there are yet not well established schemes,because different regions often lead to various optimal criterion and various schemes.In this research,we placed our eyes on the Zagunao watershed in the upper Minjiang River,Sichuan Province.The environment in the zagunao watershed was vastly changed and damaged while the cover of forests decreased,arid river valley expanded and increased cultivation area in ecologically fragile region.The influence of the fragmented landscape lies in that biodiversity and soil fertility decreased,the amount of soil erosion rose,and so on.This paper is trying to find a new method to optimize the landscape pattern for a special criterion.In the research presented in this paper,we built the spatial databases of Zagunao watershed with the support of geographic information system(GIS) and remote sensing(RS) technology.The datasets included landscape map(1974 and 2000),monthly average temperature and precipitation for ages,(DEM)digital evaluation map and soil map.For the aim of relieving the seriously focused ecological problem of soil erosion and optimizing the landscape in spatial pattern,the potential soil erosion was calculated with p-RUSLE(the potential relative universal soil loss equation) firstly,assumed that the watershed is not covered by any kind vegetation which represent the worst ecological condition.We combined the means of spatial modeling and landscape priority definition with regard of the potential soil erosion and vegetation distribution regularities in the calculating environment of GIS.By comparing the difference between the optimized landscape and the landscape in 1974,2000 respectively,the spatially optimized landscape might obviously lead to less soil erosion than that of 2000.In addition,this work presented new method for the likely research both in the area of theory and practice.