吉林省西部草地NPP时空特征与影响因素

利用2000--2006年MOD17A3数据集的年均NPP数据,通过GIS技术定量分析了吉林省西部草地NPP的时空变化特征及其自然和人文影响因素.结果表明:过去7年吉林省西部草地NPP平均值为232.14 g C·m~(-2)·a~(-1),NPP在200～300 g C·m~(-2)·a~(-1)的草地面积占草地总面积的59.47%;77.60%的草地NPP呈增加趋势,NPP增加极显著的草地面积占草地总面积的15.00%;水分条件是吉林省西部草地生长的主要控制因素;居民地对吉林省西部草地NPP的影响远大于道路,尤其在2 km以内.

Abstract：

By using the annual net primary productivity (NPP) data from 2000-2006 MOD17A3 dataset and the GIS technique, the spatiotemporal characteristics of grassland NPP in western Ji-lin Province were studied, with the related affecting factors analyzed. During the past seven years, the mean grassland NPP in this province was 232. 14 g C·m~(-2)·a~(-1), and the grassland area with a NPP of 200-300 g C·m~(-2)·a~(-1) accounted for 59. 47% of the total. 77.60% of the grassland had an increasing NPP, and the grassland area with a remarkable increase of NPP accounted for 15.00% of the total. Water condition was the main controlling factor for grass growth, and residential points had far more effects than roads, especially within 2 km from grass-land, on the NPP.

Spatiotemporal characteristics and related affecting factors of grassland net primary productivity in western Jilin Province

By using the annual net primary productivity (NPP) data from 2000-2006 MOD17A3 dataset and the GIS technique, the spatiotemporal characteristics of grassland NPP in western Ji-lin Province were studied, with the related affecting factors analyzed. During the past seven years, the mean grassland NPP in this province was 232. 14 g C·m~(-2)·a~(-1), and the grassland area with a NPP of 200-300 g C·m~(-2)·a~(-1) accounted for 59. 47% of the total. 77.60% of the grassland had an increasing NPP, and the grassland area with a remarkable increase of NPP accounted for 15.00% of the total. Water condition was the main controlling factor for grass growth, and residential points had far more effects than roads, especially within 2 km from grass-land, on the NPP.