嘉陵江流域土地利用景观格局动态分析研究

以长江上游嘉陵江流域为研究区域,以1980年、1995年、2000年3期的下垫面信息数据采集与处理为基础,在斑块类型水平和景观水平上选取了9个具有代表性的景观格局指数,分析计算嘉陵江流域景观破碎度、规则度、优势度以及均匀度在1980～2000年期间的变化趋势.研究结果表明：这20年间,嘉陵江流域的整体景观格局发生了较大的变化,流域景观破碎化程度变大,人类干扰程度增加;景观的规则性越来越差,景观结构越来越复杂;景观优势度变动较大,各景观类型所占比例差异增大,没有明显的优势类型,各组分在面积上均匀分布.此结果为今后嘉陵江流域水沙资源时空变化规律及研究提供科学借鉴.

Dynamic Analysis of Landscape Structure of Land Use in Jialingjiang Watershed

This paper takes Jialingjiang watershed on the upper reaches of the Yangtze River as survey region,based on the information data acquisition and processing of the underlying surface in 3 phases,i.e.1980,1995 and 2000.It selects 9 representative indexes that belong to class-level and landscape-level to analyse and calculate the variation tendency of landscape fragmentation,rule degree,dominance,as well as homogeneous degree in Jialingjiang watershed from 1980 to 2000.The results prove that the overall landscape pattern in the Jialingjiang watershed has changed greatly.Landscape fragmentation has enlarged and human interference degree has increased.The regularity of landscape is worse and worse,resulting in landscape structure more and more complex.Landscape dominance index has changed largely and the landscape type proportion difference has increased,there is no obvious advantage types in the Jialingjiang watershed and each component has been on a uniform distribution in the drainage area.All results provide a scientific reference for the time and space change rule and research of watershed in the Jialingjiang watershed in future.