摘要
In order to study the rules of variations in the net primary productivity( NPP) of vegetation in Guangxi,this paper used MOD17 A3 H data to compare the spatial and temporal pattern of net primary productivity of vegetation in different cities by unary linear regression method and standard deviation analysis method. It obtained following results.( i) The annual average NPP of cities in Guangxi is in the range of 498. 77-803. 97 g C/m^2·a,and the Beihai has the lowest NPP and Wuzhou has the highest NPP.( ii) The region with small vegetation NPP fluctuation in Guangxi is 6 044. 22 km^2,the region with the larger fluctuation is 37 735. 38 km^2,the region with large fluctuation is43 690. 84 km^2,the region with general fluctuation is 73 938. 14 km^2,and the region with small fluctuation is 74 622. 43 km^2,most regions have small fluctuation in vegetation NPP.( iii) Regions with basically stable NPP are largest,followed by regions with slight decline.( iv)There are great differences in the spatial distribution of NPP variations in Guangxi. Regions with slight decline of NPP are mainly distributed in the northeastern Guangxi; regions with slight increase of NPP are mainly distributed in the southern Guangxi,and regions with basically stable NPP are mainly distributed in southeastern Guangxi.
In order to study the rules of variations in the net primary productivity（ NPP） of vegetation in Guangxi,this paper used MOD17 A3 H data to compare the spatial and temporal pattern of net primary productivity of vegetation in different cities by unary linear regression method and standard deviation analysis method. It obtained following results.（ i） The annual average NPP of cities in Guangxi is in the range of 498. 77-803. 97 g C/m^2·a,and the Beihai has the lowest NPP and Wuzhou has the highest NPP.（ ii） The region with small vegetation NPP fluctuation in Guangxi is 6 044. 22 km^2,the region with the larger fluctuation is 37 735. 38 km^2,the region with large fluctuation is43 690. 84 km^2,the region with general fluctuation is 73 938. 14 km^2,and the region with small fluctuation is 74 622. 43 km^2,most regions have small fluctuation in vegetation NPP.（ iii） Regions with basically stable NPP are largest,followed by regions with slight decline.（ iv）There are great differences in the spatial distribution of NPP variations in Guangxi. Regions with slight decline of NPP are mainly distributed in the northeastern Guangxi; regions with slight increase of NPP are mainly distributed in the southern Guangxi,and regions with basically stable NPP are mainly distributed in southeastern Guangxi.
基金
Supported by State Key Research and Development Program(2016YFC0502401)
Project of National Natural Science Foundation(41661021)
Innovation Team Project for Natural Science Foundation of Guangxi(2016JJF15001)
District-level Project of Student Entrepreneurship and Enterprise Competition of Guangxi Teachers Education University(201810603277)
关键词
广西
植被
生产力
农业
Net primary productivity （NPP）
Standard deviation
Spatial and temporal variation
Guangxi
