贵州省喀斯特地区植被净第一性生产力的估算

Estimation on net primary productivity of vegetation in karst area of Guizhou province

在构建光能利用率模型的基础上,依托遥感手段,利用MODIS数据和气象资料,完成了贵州省喀斯特地区2001年植被净第一性生产力(NPP)的估算,并通过喀斯特地区与非喀斯特地区植被NPP的对比,重点研究了喀斯特地区植被NPP的时空变化特征,得到以下主要结论:(1)喀斯特地区与非喀斯特地区的植被NPP在时空分布上存在明显差异,非喀斯特地区的NPP平均值高出喀斯特地区约13.3%。(2)非喀斯特地区的NPP频度分布呈似双峰型,而喀斯特地区的NPP值似正态分布。(3)年内植被NPP的最高值和最低值均出现在7月和1月,但喀斯特地区比非喀斯特地区的整体波动性大。(4)喀斯特地区植被NPP的季相空间变化显著,石漠化较为严重的地区其植被NPP明显小于其它地区,且季间差异较明显。

On the construction of light use efficiency model, by means of RS technology and using MODIS data and meteorological data, the net primary productivity （NPP） of vegetation in Guizhou in 2001 is estimated in the paper. By the comparison between karst area and non-karst area, spatial-temporal variations of NPP in karst area are studied mainly. It is concluded that. （1） There are obvious differences on spatial-temporal variations between karst area and non-karst area. The mean NPP in non-karst area is 13. 3% larger than that in karst area. （2） The frequency distribution in karst area takes on double-peak style, while in non-karst area normal school style. （3） Both maximum and minimum NPP present in July and January annually, but the fluctuation of NPP in karst area is larger than that in non-karst area. （4） Seasonally spatial change of NPP in karst area is prominent. NPP is lower than other areas and fluctuation of NPP with seasons are more obvious in area of seriously rock-desertification.