植被净初级生产力(net primary productivity,NPP)是表征陆地生态系统功能状况和碳循环的重要指标。基于20002015年MODIS MOD17A3 NPP数据和对应年份的气象数据,采用相关分析、回归分析和空间分析相结合的方法,定量研究近16年山东省植被NPP的时空变化特征及其对气候变化的响应。结果表明:20002015年山东省植被NPP总体呈波动增加趋势,年均NPP介于501.29 ~ 583.55 g C·m~(-2)·a~(-1),年际增加速率为2.05 g C·m~(-2)·a~(-1);植被NPP表现为南高北低,东高西低的空间分布规律,大部分地区的植被NPP在200~400 g C·m~(-2)·a~(-1),主要集中在山东省中部和西部地区;轻微增加的地区占全省总面积的44.5%,主要分布于山东省中部、西部和西南部;通过年均NPP与年均气温和年降水量的逐像元相关性分析,植被NPP与温度和降水量均存在明显正相关,降水量是影响植被NPP变化的主导因子。
英文摘要:
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.