ASSESSMENT OF THE IMPACT OF LAND USE CHANGES ON APPROPRIATION OF NET PRIMARY PRODUCTIVITY IN ANJI, CHINA

The land use changes (LUC) have altered the vegetation net primary productivity (NPP). Human appropriation of net primary productivity resulting from LUC (HANPP(luc)) can be used to quantify the consequence of LUC on vegetation NPP. HANPP(luc) is defined as the difference between the potential and actual NPP availability in ecosystems. Based on the Thornthwaite Memorial model, CASA model, and multiple linear regression, this paper estimated the potential and actual NPP, explored the temporal and spatial changes of HANPP(luc), and analyzed the impact of LUC on vegetation NPP in Anji, China. There was a significant increasing trend in annual HANPP(luc) from 1984 to 2014. The total mean value of HANPPluc was 155 Gg C year(-1), while HANPP(luc) per unit was 82 +/- 54 g C m(-2) year(-1). The growth of Moso bamboo (Phyllostachys pubescens) forests area caused an increase of 33.5 Gg C year(-1) in NPP. However, the urbanization was the main reason for the decrease of NPP, which resulted in a decrease of 97.9 Gg C year(-1) in NPP. This study quantified the impact of LUC on vegetation NPP, and provided key data for urban landscape planning, Moso bamboo management, and regional ecological carbon cycle models.