关键词: 水库生态系统, 磷收支, 影响因素, 磷调控

Abstract: Net primary productivity (NPP) of vegetation is an important indicator for the ecological functions and carbon cycling in terrestrial ecosystems. Based on MODIS MOD17A3 NPP and meteorological data over the past 16 years (from 2000 to 2015), the spatial and temporal variations of vegetation NPP in Shandong Province, as well as its responses to climate change, were estimated using the methods of correlation, regression, and spatial analysis. The results showed that vegetation NPP increased with fluctuations from 2000 to 2015, with mean annual value between 501.29 and 583.55 g C·m^-2·a^-1. Vegetation NPP increased at a rate of 2.05 g C·m^-2·a^-1 during the study period. There were substantial spatial variations in vegetation NPP, with high values in the south and east and low values in the north and west of the province. The vegetation NPP values in most areas of Shandong Province ranged from 200 to 400 g C·m^-2·a^-1, especially in the central and west parts. In areas with 44.5% of provincial total area, the mean vegetation NPP showed a slight increase for the period of 2000-2015, mainly occurring in the central, west and southwest regions. There were significantly positive correlations between vegetation NPP and temperature and precipitation. The latter was the dominant climatic factor driving the changes of vegetation NPP.

Key words: reservoir ecosystem, phosphorus budget, affecting factor, phosphorus regulation.