吉林省大安市草地资源动态变化研究--基于RS和GIS的遥感调查

采用时间尺度为15年的1987年TM和2002年ETM 美国LANDSAT卫星遥感影像,结合野外调查、各种图件和文字资料,利用GIS软件人机交互式解译提取大安市草地信息,以此进行了时间和空间序列动态变化分析。结果表明,大安市草地退化严重,低、中、高覆盖度草地均有不同程度的退化,退化面积分别为22.06%、45.01%、62.25%,高覆盖度草地退化最严重;并分析了导致研究区草原退化的自然因素和人为因素,提出了恢复该区草原生态环境的治理措施。

Studies on Dynamic Changes of Grassland in Daan City of Jilin Province --Remote Sensing Survey Based on RS and GIS

By using TM image in 1987 and ETM~ image in 2002 from American LANDSAT satellite,and integrating field surveying,all kinds of maps and text datum,grassland information man - machined interactively interpreted and extracted by ArcView and Arcinfo GIS software, and based on that,spatio - temporal dynamic changes on grassland were analyzed. The results indicated that the problem of grassland degradation in study area is quite severe,and 47.10% of the total land area of Daan city is grassland in 1980s,but only 22.48% at the beginning of the century. Low,moderate and high coverage grasslands are all degraded with various degrees,the area percentage of grassland degradation is 22.06%, 45.01%, 62.25% respectively,and degradation of high coverage grasslands is most serious. Natural and factitious factors on grassland degradation in study area were analyzed,and treatment measures to restore eco - environment of grassland were put forward.