基于遥感数据的黔南州植被净初级生产力分析

Analysis of Vegetation NPP in Qiannan Prefecture Based on Remote-sensing Data

基于2001~2013年的MOD17A3数据集,在ArcGIS操作平台上分析了黔南州植被NPP的时空变化特征。结果表明:黔南州植被年均NPP为500~900 g/(m^2·a)的区域占总面积的90.2%;从2001年到2013年,黔南州植被NPP总体上呈下降趋势,但在2013年回升明显;与2001年相比,2013年黔南州年均植被NPP大部分区域处于增加趋势,主要位于黔南州北部、西部与南部地区;在6种不同类型植被中,林地的NPP值最高,农作物的NPP值最低;从2001年到2013年,不同植被类型NPP的年际变化都呈波动下降趋势,但以灌丛、永久性湿地NPP的减少趋势最明显,以草地NPP的变化幅度最小。

We studied the spatio-temporal variation characteristics of vegetation NPP（ Net Primary Productivity） in Qiannan prefecture based on MOD17A3 dataset from 2001 to 2013 by Arc GIS software. The results showed that the area of regions with the annual average vegetation NPP of 500 - 900 g/（ m^2·a） accounted for 90.2% of the total area of Qiannan prefecture. The vegetation NPP in Qiannan prefecture generally showed a declining trend from 2001 to 2013,but it increased markedly in 2013. In 2013,most regions of Qiannan prefecture had a higher annual average vegetation NPP than that in 2001,and these regions were mainly located in the north,west and south of Qiannan prefecture. Among 6 types of vegetations,forestland had the highest NPP value,while cropland had the lowest NPP value. From 2001 to 2013,the interannual variations in NPP of different types of vegetations revealed a fluctuant decreasing tendency,but the decreasing tendency of bushwood NPP and permanent wetland NPP was the most obvious,and the variation amplitude of grassland NPP was the smallest.