<正>贵州省山高坡陡、地块破碎，地物光谱特征复杂，受“同谱异物，同物异谱”的干扰大。在应用中巴地球资源卫星数据进行贵州省森林资源调查研究中，单纯靠传统分类方法难以达到理想的效果。笔者主要采用非线性波段比等方法，有效地扼制了干扰，通过灰度值、光谱剖面曲线等分析，总体上提高了图像的对比度及各种地类差异，从而提高了计算机分类的精度。

Based on the experiment of water stress in pots, the drought tolerance characteristics of the main afforestation trees in northwest Hubei province were studied. The index variation characters of shape, water relations and physiological metabolism of Pinus elliottii, Couningharnia lanceolata, Robinia pseuidoacacia, Platycladus orientalis, Hi ppophae rhamnoides (introduction), and. Caragana korshinskii (introduction) under water stress were emphatically analyzed; based on that, the drought tolerance characteristics of potted trees were synthetically evaluated. The results showed that six seedling trees for testing had stronger ability of fighting the drought. The ability of fighting the drought of Caragana korshinskii and Platycladus orientalis were stronger than that of Pinus elliottii, Couningharnia lanceolata and Robinia pseuidoacacia.