基于3S技术的玛曲县草地植被覆盖度变化及其驱动力  

Vegetation coverage changes and analysis of the driving forces in Maqu county based on 3S technology

作　　者：李文龙[1] 薛中正[1] 郭述茂[1] 徐丹丹[1] 范成勇[1] 张晶[1] 

机构地区：[1]兰州大学草地农业科技学院农业部草地农业生态系统学重点实验室,兰州730020

出　　处：《兰州大学学报（自然科学版）》2010年第1期85-90,95,共7页Journal of Lanzhou University(Natural Sciences)

基　　金：国家自然科学基金项目(30700100);国家高技术研究发展计划(863计划)项目(2007AA10Z232);甘肃省"十一五"科技支撑项目(0708NKCA121)

摘　　要：利用GIS空间统计分析、多元统计分析方法和改进的遥感二分像元估算模型估算了玛曲县高寒草地植被覆盖度。结果显示:玛曲县2000,2002,2004,2006,2008年的平均植被覆盖度依次为66.17%,56.41%,57.34%,77.38%,58.93%。玛曲县高寒草地植被覆盖度总体呈下降趋势,优等植被的退化比较严重。草地植被的演变情况主要由优等植被覆盖向劣等植被覆盖演变,进一步证实了玛曲县草地呈退化趋势。并对导致玛曲县高寒草地植被覆盖度变化的因素进行PCA分析,结果显示人为因素是导致玛曲县植被覆盖度变化的主要因素,进一步说明人类活动对玛曲高寒草地生态环境变化影响巨大。Multivariable statistical analysis and improved second sub-pixels model of remote sensing were used to estimate the vegetation cover of the arctic-alpine meadows in Maqu county by GIS. In consequence, the average vegetation coverage of the study area was 66.17% in 2000, 56.41% in 2002, 57.34% in 2004, 77.38% in 2006, 58.93% in 2008 respectively. The vegetation cover of the arctic-alpine meadows in the study area tended to descend totally, especially with the degradation of the advanced vegetation. The main evolution of the rangeland was that advanced vegetation converted into that of a lower grade and this evidence mostly proved the degradation tendency of the rangeland in Maqu county. Also, factors which had caused the conversion of the vegetation cover was analyzed in the study area with PCA method. The result suggests that human activities are a major factor causing the conversion of the vegetation cover. Moreover, the result indicates that human activities exhaustively disrupt the ecological environment there.

关 键 词：3S技术 植被覆盖度 驱动因子 玛曲县 

分 类 号：S181[农业科学—农业基础科学] TP79[自动化与计算机技术—检测技术与自动化装置]