Study on the Technology of Forest Vegetation Productivity Monitoring Based on RS and GIS

Taking the four counties/cities/districts(Yongan,Liancheng,Zhangping and Xinluo) of Fujian Province as the study area,using the materials of average annual precipitation,temperature and soil information,combined with the improved NPP model and productivity correction factor,the inversion of forest climate productivity,forest productivity and wood output were realized.Afterwards,the spatial variation of these productivities was analyzed.The results showed that: the forest climate productivities of these counties(cities,districts) were on a higher level overall,which were between 1 693.006-2 312.03 g/(cm2·a) and with the mean value of 2 112.645 g/(cm2·a).The forest productivities were between 484.1-2 001.5 g/(cm2·a) which had a large difference,and the mean value was 1 682.025 g/(cm2·a) which was only 79.6% out of the mean value of the forest climate productivities;it illustrated that the forest soil fertility had a significant impact on the forest productivity.The wood output were between 4.3-17.7 g/(cm2·a),of which the mean value was 14.9 g/(cm2·a).