本文讨论了以热带森林植被为主体的再生资源的面积动态变化监测。研究中包括两个部分。首先,我们利用多时相遥感图像对大面积的西双版纳州进行地类判读,系统地分析了森林植被的动态变化。其次,利用Landsat MSS和TM数据对自然保护区的动态变化进行了包含无监督分类和归一化差值植被指数分析的数字图像处理,变化分类也相当符合实际。总的实验结果表明,这种监测方法是很有效的,可在再生资源监测中特别是在森林植被监测中加以推广应用。

The Monitoring of dynamic change of forest area in tropical forest vegetation of Xi-shuangbanna Prefecture has been discussed in this paper. There are of two parts being included:1, Using multkemporal remote sensing imagery to interpret forest area change of Xi-shuangbanna Prefecture.In monitoring of the forest area dynamic change, used of multitemporal remote sensing imagery are: (1) aerial photographs Feb-1965; (2) Landsat MSS 02-Mar-1973; (3) aerial photographs Feb-1981; (4) Landsat TM 02-Feb-1988 and Spot XS 16-Feb-1988.According to multitemporal remote sensing imagery interpretation, the forest area in 1965, 1973, 1981 and 1988, of Xishuangbanna Prefecture have been calculated. Results from calculation showed that about 33.72% of the total area of Xishuangbanna Prefecture is covered by tropical and subtropical forest in 1988. But, according to the interpretation of aerial photographs of 1965, the forest area was 46.46% of the whole Prefecture. The comparison of the forest area showed that the decrease rate is about 0.55% per year.2, Using difference imagery to analyse forest area change of nature reserves.Forest area change in nature reserves has been studied by means of digital analysis of Laudsat MSS (1973) and TM (1988) images. An unsupervised classification consisting of principal components analysis fllowed by a clustering procedure was adopted. The normalized difference vegetation index (NDVI) was used as a measure to assess the change in vegetation amount.It was provisionally concluded that degradation of forest area have ceased inside the nature reserve, while outside the nature reserve boundaries, forested area have decreased significantly.The results showed that this method was effective and could be extensive used in renewable resources especially forest vegetation monitoriing.