三峡库区森林蓄积量遥感监测及其动态变化分析

摘要

The study was conducted to acquire the forest volume and its dynamic change in Three Gorges Reservoir Region quick-ly and efficiently .With the sixth and seventh of national cotinuous forest resources inventory and Landsat TM/ETM+ima-ges in 2003 and 2008 , the partial least squares regression model was generated and the predicting map of forest volume in Three Gorges Reservoir Region was constructed.Furthermore, the forest volume dynamic changes in this area were conduc-ted.The estimation precisions are 91.84%and 94.61%, respectively.The total forest volume of Three Gorges Reservoir Region are 94 446 687 and 104 314 340 m3 , respectively .The forest volume has a slow and steady arise from 2003 to 2008.The forest volume is mainly distributed at altitudes of 400 to 1 600 m and at slopes of 5-44.However, it is well dis-tributed at every slope aspect.%为了快速有效获取三峡库区森林蓄积量及其时空动态变化特征，基于第六次（2003年）和第七次（2008年）森林资源一类清查样地数据和TM/ETM＋遥感影像，利用偏最小二乘回归方法构建了森林蓄积量估测模型，估算了三峡库区森林蓄积量，定量分析了蓄积量的时空变化特征。利用预留独立样本对模型进行精度验证，两期模型的总体预测精度分别达到91．84％和94．61％；2003年和2008年三峡库区森林总蓄积量分别为94446687、104314340 m3，从2003年至2008年呈现缓慢增长的趋势；两期森林蓄积量在海拔400～1600 m、坡度5°～44°之间分布最多，在坡向上的分布较为均匀。