基于遥感技术的打狗河流域1999-2009年间石漠化及绿化研究

摘要

采用遥感技术对打狗河流域1999-2009年期间的植被覆盖及变化进行提取，完成了区域内耕地、石漠、火烧迹地、荒草地、灌草、灌丛、密灌及林地等7种类型土地的相互转化分析。重新定义了石漠化及绿化，并根据植被退化程度将全区石漠化分为轻度、中度和重度；将全区植被恢复程度分为轻度、中度和深度。基于遥感技术提取的7种地物类型数据的分析，全区石漠化有轻度加剧的迹象，石漠化比例略高于绿化比例。10年间石漠化和绿化相互转化的面积基本相当，分别占全区面积的30.83％和30.55％；其中中度和轻度石漠化面积分别约占8.60％和30.83％，均略大于中度和轻度绿化的6.85％和30.55％。%After extraction of the vegetation cover and the change in Dagou River Basin during 1999-2009 ac-cording to the remote sensing technology , the conversion analysis of the 7 types of vegetation is completed inclu-ding cultivated land, hamada, burns, weeds, bringing, thickets, dense thickets and forest land.By redefini-tions of the rocky desertification and greening , the whole area was divided into mid , moderate and severe de-grees.The analysis of 7 types of vegetation suggests that the desertification rate is slightly higher than greening . In 10 years of mutual transformation , rocky desertification and greening area are 30.83% and 30.55%. The moderate and slight rocky desertification areas account to about 8.60% and 30.83%, slightly larger than the moderate and greening of 6.85% and 30.55%.