Analysis on Spatial and Temporal Features of Ecosystem Productivity in Huang fu-chuan Basin
The main climatic factors data in Huang fu-chuan basin from 1961 to 2010 and statistics data in Zhunge'er from 1979 to 2000 are used to analyze spatial and temporal features of terrestrial net primary productivity (NPP) and the production function (food production) of agro-ecosystems, by using NPP mathematical model and statistical methods. The results show that: firstly, from 1961 to 2010 the overall change trend of NPP in Huang fu-chuan basin is not obvious, but inter-annual variation of NPP is significant. The dynamics of township NPP is the same, and the inter-annual variation is also significant. The spatial difference of NPP is significant, the southeast is high and the northwest is relatively low, with the same spatial variation of precipitation. Secondly, grain yield per unit area of township in Huang fu-chuan Basin has significant growth trend, and inter-annual fluctuation is significant, the impact of precipitation on the grain yield is a decisive in some years. Spatial difference of grain yields per unit area is obvious, the northern is high, the southeast is middle and the western is low. Thirdly, in Huang fu-chuan basin the temporal correlation between NPP and grain yield per unit area is significant, while the spatial correlation is not obvious. Because NPP is mainly affected by natural conditions, and grain production is affected by many factors such as natural conditions, agricultural policies, and science and technology inputs etc.
Huang fu-chuan basinClimate changeNPPGrain yield per unit areaSpatial and temporal features
国家科技期刊平台
NSTL
万方数据
维普
