基于遥感的广州市林分光合有效辐射分析研究

以1998年Landsat TM,2003年Landsat ETM+和2007年IRS-P6卫星数据为信息源,利用归一化植被指数(NDVI)与光合有效辐射(PAR)的线性关系,得到广州市PAR的情况,研究其动态变化。结果表明:在经济快速发展的10年中,1998—2003年广州市林分PAR逐年增强,特别是阔叶林增加较快,而针叶林保持较稳定的状态,森林生产力较高。2003—2007年广州市区、花都区、番禺3个区的林分PAR明显减弱,2007年广州市区和番禺区林分光合有效辐射比率(FPAR)较小,这说明广州市在珠三角发展的带动下城市化进程加快,人为活动的影响越来越明显。

RS-based Analysis on Guangzhou Forest Stand PAR

In this paper,Landsat TM of 1998,Landsat ETM+ of 2003 and IRS-P6 of 2007 satellite data were used as the information source and the linear relationship between the normalized difference vegetation index(NDVI) and the photosynthetically active radiation(PAR)utilized for obtaining the photosynthesis effective radiation situation and studying the dynamics of forest stands in Guangzhou City.The results showed that in the course of rapid economic development for a decade the Guangzhou forest stand PAR increased year by year from 1998 to 2003,especially in broadleaf forests increased faster,while that of the coniferous forest maintained a more stable state,which suggested a higher forest productivity.From 2003 to 2007,in 4 districts of Guangzhou City,forest stand FPAR significantly weakened.In 2007,in Panyu District and the city urban area,the forest stand photosynthetically active radiation rate(FPAR) was small.This showed that the urbanization process of Guangzhou City was accelerating and the impacts of human activities were increasingly apparent.