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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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灾害胁迫下建平县沙棘人工林的时空特性
DOI: 10.3724/SP.J.1145.2009.00464, PP. 464-468
Keywords: 沙棘,沙棘木蠹蛾,灾害,遥感,时空特性
Abstract:
辽宁省建平县沙棘衰退主要是干旱胁迫和沙棘木蠹蛾蛀食危害复合作用的结果，本文统称沙棘灾害.选择建平县东北部作为实验区，利用5期tm遥感图像研究沙棘林的光谱反射特征，并计算样地的归一化植被指数(ndvi)，得到了多年沙棘植被变化特征.研究结果表明，ndvi增加表明沙棘林生长状况良好，而下降则表明在灾害胁迫下沙棘人工林出现衰退.结合地面数据，初步明确了沙棘灾害程度的ndvi临界值，以ndvi下降幅度至≤0.1为轻度受灾区，ndvi下降幅度在＜0.1≤0.25为中等受灾区，ndvi下降幅度＞0.25为严重受灾区.应用rs与gis相结合方法，对研究区的遥感影像进行人机交互解译，得到5期土地利用类型分布以及面积统计，结果表明，1991～2004年间沙棘面积显著减少，主要向耕地、荒地与裸地转化.本文研究结果为实时动态、大面积监测沙棘人工林灾害奠定了基础.图5表2参21
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