基于遥感的漳平市杉松林地表可燃物负荷量估测

 杉木林和马尾松是分布于漳平市的两种易燃的可燃物类型。其可燃物负荷量的多少决定着林火行为。在利用ASTER计算杉木林小班平均植被覆盖度的基础上估算其郁闭度,通过与地面调查结果比较分析,校正已发生明显变化的小班郁闭度。根据已有估测方程,结合小班数据中的年龄、胸径和树高等因子对杉木地表可燃物负荷量进行了估测,据此对各杉木小班的燃烧性、燃烧强度及火险等级等因素进行初步评价。最后对漳平市另一易燃的可燃物马尾松类型开展地表可燃物负荷量估测及分析。

Estimation of Surface Fuel Loadings of Chinese Fir Plantation and Masson Pine Plantation in Zhangping City Based on Rs

Chinese fir plantation and Masson pine plantation are two fire-prone fuel types distributed in Zhangping city,their fuel loadings determine fire behavior.Based on the calculation of mean vegetation fraction of each Chinese fir plantation stand,mean canopy closures are also estimated by regressive analysis.After careful comparison with the result of field survey,the original canopy closures of some fir stands,which had changed a lot,were corrected with the aid of remote sensing.Then,canopy closure,and other factors such as age,DBH,mean stand height were used to estimate the surface fuel loadings of Chinese fir plantation stands by the existing estimation equation,and each stand's combustibility,fire intensity and fire risk ranking were evaluated according to the result.Finally,the other fuel types of Masson pine plantation's surface fuel loadings were also estimated and analyzed.