基于CASA模型的云南省植被净初级生产力遥感估算

REMOTE SENSING ESTIMATION OF NET PRIMARY PRODUCTIVITY OF VEGETATION(NPP)IN YUNNAN PROVINCE BASED ON CASA MODEL

植被净初级生产力能够反映植被的生产能力、当地的生态资源及生态资源潜力。采用多时间序列MODIS的NDVI遥感数据和气象数据,利用CASA光能利用率模型在空间分析技术支持下反演估算云南省2015年植被净初级生产力(NPP)。结果表明:(1)云南省2015年平均NPP值为804.904 2 gC/(m^2·a^-1),总值为0.317 212 745 PgC;(2)2015年云南省NPP的平均值1月至2月、5月至9月、10月至12月处于下降趋势,2月至4月、9月至10月处于上升趋势,一年中的最高值在5月份,最低值在9月份;(3)植被净初级生产力的高值位于云南省的南部和西部。

The net primary productivity of vegetation can reflect the productivity of vegetation,local ecological resources and potential of ecological resources.Using NDVI remote sensing data and meteorological data of MODIS with multiple time series,CASA light energy utilization model was used to invert and estimate Yunnan Province’s net primary vegetation productivity(NPP)in 2015 with the support of spatial analysis technology.The results showed that:(1)The average NPP value in Yunnan Province in 2015 was 804.904 2 gC/(m^2·a^-1),and the total value was 0.318 742 063 PgC.(2)In 2015,the average value of NPP in Yunnan Province was in a downward trend from January to February,from may to September,from October to December,from February to April,and from September to 10,with the highest value in May and the lowest value in September.(3)The high value of net primary productivity of vegetation is located in the south and west of Yunnan Province.