Abstract:

In order to explore and research the influence of land use and cover change (LUCC) on net primary productivity of middle-sized and small cities during urbanization process, taking Zhangjiagang City as the study area, the author applied the MODIS image data and models related to net primary productivity (NPP) to estimate the act and potential NPP in 2008 and studied the characteristics of spatial distribution of the losing NPP caused by LUCC. The results showed that in urbanization, because of the LUCC of Zhangjiagang City, it lost a lot of NPP, the NPP in city area decreased sharply, the value of NPPlucc in forest and grassland relatively low, and which of agro-ecosystems was minimum for irrigation and fertilization, so had a higher production than potential NPP. The NPPlucc in Zhangjiagang appeared to have a decline trend from city to rural areas, there had two protuberance peaks on the urban and rural connecting areas and industrial regions in countryside. The results also showed that the disturbance to natural ecosystem was decreased by applying management measures and technology ways, then the loss of NPP caused by LUCC and human activities was minimized. It took a feasible way to decrease human appropriation of net primary production (HANPP) and resolve existing problems in related to natural resource exhausted and sustainable development.