近10年来山东区域NPP时空变化分析

净初级生产力(NPP)可以反映植被的固碳能力,估算区域的NPP对研究区域碳循环和气候变化有重要意义。本研究利用光能利用率模型(CASA)估算了山东省2001-2010年NPP的时空变化,在CASA模型中引入陆面水分指数(LSWI)来替换水分估算模块,并分析了该区域NPP与环境因子之间的关系。研究表明,山东省每年植被固碳量约为3.46×1013 g,其中农田的NPP占了山东省总NPP的75%以上;2001-2010年间,山东省NPP以每年0.7×1012 g的速度增加,主要归因于该区域温度和降水的增加。

Terrestrial net primary production and its spatio-temporal patterns in Shandong Province during 2001-2010

Net primary productivity can reflect the carbon sequestration capacity of vegetation. The estimation of regional net primary productivity is very important for the study of regional carbon cycle and climate change. The Carnegie Ames Stanford Approach (CASA) biosphere model was used to estimate annual net primary productivity from 2001 to 2010 and to analyze the spatio temporal change for Shandong province, in this study. In the model, the land surface water index was used to replace water stress estimation module. The relationship between NPP and environmental factors were also analyzed. In Shandong province, the annual vegetation carbon sequestration capacity is about 3.46×1013g, in which the NPP of farmland accounting for 75%. Due to regional temperature and precipitation increasing, the average annual growth of NPP in the region is 0.7×1012 g from 2001 to 2010.