内蒙古草地NPP时空变化格局及其与水热因子耦合关系

选取内蒙古作为研究区，基于卫星遥感数据、地面气象观测数据及其他统计资料，利用CASA模型估算了内蒙古草地净初级生产力（NPP），分析了2001—2016年内蒙古草地NPP的时空变化格局及其与水热因子的耦合关系，结果表明:2001—2016年内蒙古草地NPP多年平均值为343.46 g C/（m²·a），总体上呈现由东北至西南逐渐递减的分布格局；年均NPP总值约为0.218 Pg C，16年共计3.483 Pg C。大部分地区草地NPP呈波动上升趋势，年均增长率约为4.27 g C/（m²·a）。内蒙古草地NPP与年均温的偏相关系数为0.306，与年总降水量的偏相关系数为0.622；大部分地区草地NPP与年总降水量呈显著的正相关关系，而与年均温无显著相关。

Analysis of Temporal-Spatial Variations of NPP and Coupling Relationship with Hydrothermal Factors in Grasslands of Inner Mongolia

Based on satellite remote sensing data, ground meteorological observation data and other statistical data, the CASA model was used to estimate NPP of grassland in Inner Mongolia, and to analyze the temporal-spatial variation of NPP and its coupling with hydrothermal factors. The results showed that the average annual NPP of grassland in Inner Mongolia was 343.46 g C/(m²·a) from 2001 to 2016, and the distribution of NPP was characterized as increase from northeast to southwest; the average annual NPP value was about 0.218 Pg C and the total value was 3.483 Pg C in 16 years. In most districts, grassland NPP fluctuated upward with an average annual growth rate of 4.27 g C/(m²·a). The partial correlation coefficient between the NPP of grassland and annual mean temperature in Inner Mongolia was 0.306, the partial correlation coefficient between the NPP of grassland and annual total precipitation was 0.622; the NPP of grassland had the significant positive correlation with annual total precipitation in most areas, but not significantly related with the annual mean temperature.