【摘要】 植被净初级生产力(NPP)体现植被在自然条件下的生产能力,是全球变化领域的热点内容。文中以呼伦贝尔市为研究区,利用遥感生产力模型(CASA模型)获取研究区2000、2005、2010和2015年四期NPP数据,分别从NPP空间分布特征、特征值变化、NPP变化的空间格局和不同植被类型NPP变化等方面分析近15年来呼伦贝尔市NPP的时空变化特点。结果表明:(1)呼伦贝尔市NPP空间分布呈现出明显的地带规律性,从西往东有明显的增加趋势;(2)呼伦贝尔市NPP取值范围主要集中在200-400g C/(m2·a),年均NPP为340.7g C/(m2·a),NPP取值>600g C/(m2·a)的面积虽然占比较小但有明显的增加趋势;(3)在2000-2015年期间,呼伦贝尔市NPP呈现出先略微下降后逐渐增加的趋势,西部草地区域呈现出持续下降趋势,而其他区域略有波动但整体增加趋势;(4)从不同植被类型NPP变化结果来看,在2000-2015年期间,旱地与水田呈现出逐渐增加趋势,天然草地呈现出逐渐减少趋势,其它植被类型的NPP变化虽有波动但总体呈现增加趋势。更多还原

【Abstract】 Net primary productivity(NPP),one of the global change research hot spot,can represent the production capacity of vegetation. Taking Hulun Buir as the study area,MODIS-NDVI,landcover dataset and meteorological data were used to estimate NPP based on an improved Carnegie-Ames-Stanford Approach model(CASA),and to analyze the temporal-spatial characteristics of vegetation NPP in Hulun Buir from 2000 to2015. The results showed that:(1) The spatial pattern of NPP in Hulun Buir showed a good strip regularity that there was an obvious increase trend from southwest to northeast.(2) The range of NPP in Hulun Buir was mainly between 200 and 400 g C/(m2·a) with an average annual NPP of 340. 7g C/(m2·a) from 2000 to 2015. Although not too much high values of NPP were found in Hulun Buir,its proportion was increasing year by year.(3)From 2000 to 2015,the NPP of Hulun Buir showed an decreasing trend in the first few years while an increasing trend in the rest years.(4) For different vegetation types,the NPP of cultivated land showed an continuous increasing trend while native grassland showed an continuous decreasing trend from 2000 to 2015. The NPP of other vegetation types showed an increasing trend on the whole with fluctuations in some years.更多还原