基于多时相Landsat5/8影像的岷江汶川-都江堰段植被覆盖动态监测  

Dynamic monitoring of fractional vegetation cover along Minjiang River from Wenchuan County to Dujiangyan City using multi-temporal landsat 5 and 8 images

作　　者：彭文甫[1,2] 王广杰[1,2] 周介铭[1,2] 徐新良[3] 罗怀良[1,2] 赵景峰[1,2] 杨存建[1,2] 

机构地区：[1]四川师范大学,西南土地资源评价与监测教育部重点实验室,成都610068 [2]四川师范大学,地理与资源科学学院,成都610068 [3]中国科学院资源环境科学数据中心,北京100101

出　　处：《生态学报》2016年第7期1975-1988,共14页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(41371125)

摘　　要：植被覆盖度是衡量地表植被状况和指示生态环境变化的一个重要指标。基于像元二分模型,利用Landsat5/8遥感影像和DEM数据,对岷江汶川-都江堰段植被覆盖动态变化进行了监测,并结合高程、坡度和坡向数据,分析了汶川地震前后植被受损与恢复的空间动态格局变化。研究表明:植被覆盖总体良好,大部分区域的植被覆盖度均在中、高度以上,空间格局上呈现由汶川县东部、都江堰市西北部的龙门山区向两侧减少的总体趋势;地震造成植被受损面积达63808.7 hm^2,且集中分布于海拔567—4331 m、坡度26—51°的范围以及东坡、北坡、南坡和西坡;震后5a,植被恢复面积17786.47 hm^2,主要分布在海拔576—2180 m与3256—3793 m、坡度小于9°和26—51°以及东坡、东南坡和和南坡;高程和坡度对植被损毁与恢复的影响明显高于坡向。The terrestrial ecosystem plays an important role in maintaining the structure,function,and environment of earth systems,and therefore,human survival. Fractional vegetation cover（ FVC） is an important indicator of ecological changes in the environment,and an important spatial parameter of land surface vegetation status for various ecological models. It is very important to estimate the changes and patterns of FVC within the fragile ecological system of the Minjiang River,which is located in a transition zone between the Tibetan Plateau and Sichuan basin. FVC information in the arid valley of the Minjiang River was extracted from remote sensing data,DEM,and GIS technology following the dimidiate pixel model. Thedifferentiation characteristics of the spatial and temporal dynamic patterns of FVC,vegetation damage caused by the Wenchuan earthquake,vegetation restoration,elevation,slope,and aspect were also quantitatively studied. The results showed that：（ 1） the vegetation coverage was generally good during the study period; there were variations in levels of FVC,and the FVC in most areas was above medium and high levels. The overall spatial pattern showed reduced FVC on either side of the Longmen Mountains,in eastern Wenchuan County,and northwestern Dujiangyan City. The FVC change tended to increase first,then decrease with increasing elevation rendering. Above the lower levels,FVC was mainly distributed at elevations of 4331—4869 m,where the FVC decreased with increasing slope. More than 24% of the vegetation coverage was distributed in the area where the slope was less than 9°; there was little or no vegetation coverage in areas where the slope was greater than 51°. The FVC also changed according to aspect. It was mainly distributed on the eastern,western,and southern slopes.（ 2） The area of vegetation damage caused by the Wenchuan earthquake was 63808.7 hm^2. Severe damage to vegetation occurred mainly within the range of 567—4331 m elevation,on slopes of 26—51°,with eastern,northern,southe

关 键 词：植被覆盖度 像元二分模型 时空格局 岷江 

分 类 号：Q948[生物学—植物学]