基于TM遥感数据的汶川地震极重灾区生态恢复研究

本文以地震极重灾区2006、2008和2011年3期Landsat TM遥感影像为数据源,利用GIS提取灾区土地利用信息,结合坡度和高程等地形因子对灾区主要生态系统面积的变化进行综合分析.结果表明:2008年地震对灾区生态环境造成严重破坏,使研究区农田、森林和草地生态系统分别减少了124.6km2、461.6km2和9...

Research on Ecological Restoration in Wenchuan Earthquake Badly-damaged Regions Based on TM

Wenchuan Earthquake caused great damage to the ecological environment in the disaster-strick- en area. In order to know the current recovery of the ecological environment damaged by the earthquake and provide data support for relevant researchers and decision makers, this paper took Landsat TM remote sensing images of June or July during 2006, 2008 and 2011 of Wenchuan earthquake disaster-stricken area as data sources, used computerized and artificial visual interpretation method to extract the land uses in- formation of the study area, and combined topographic ~actors such as elevation and slope to comprehen- sively analyze the reasons of the change of major ecosystems （farmland, forest and grassland）. The re- suits showed that the earthquake damaged the ecosystem of the study area seriously, resulting in substan- tial shrinking of farmland, forest and grassland by 124. 6km2, 461.6kin2 and 92.3km2 respectively in the study area, and the farmland ecosystem had the most serious loss in Beiehuan, Qingchuan and Pingwu counties, while the forest ecosystem lost 285.5km2 in Wenchuan County. The degree of influence on each ecosystem also varies a lot according to different altitudes and slopes. Up to the 2011, the status of the damaged ecosystem had got better in the study area through natural succession and artificial restoration in- tervention. Farmland, forest and grassland ecosystems had experienced certain degree of recovery, their areas increased 82.8km2, 58. akm2 and 174. 9km2 respectively. The recovery of farmland and forest eco- systems is not satisfactory while the area of grassland ecosystem had got the most increase, in 2011 which had exceeded the reduced area damaged by the earthquake in 2008, whereas the whole recovery of the ecosystems in research area was not ideal. Further measures of ecological recovery are thus in dire need of.