呼伦贝尔森林草原交错区近30年NPP动态与气象因子的相关性研究

Correlations between NPP dynamic and climatic factors of nearly 30 years in Hulunbeier grass staggered district

植被净初级生产力(net primary productivity,NPP)及其对气候变化的响应研究是全球变化的核心内容之一。应用遥感影像、气象数据、光能利用率遥感模型,逐像元分析1982-2010年呼伦贝尔林草交错区NPP的时空变化及其与气候因子的关系。结果表明:1)NPP平均值由大兴安岭山地向东西两侧逐渐降低,呼伦贝尔草原区最低(均值0~350g C·m-2a-1),高值区主要分布在大兴安岭林区(450~520g C·m-2a-1);2)近30a大兴安岭林区中北部区域像元尺度NPP呈弱增长(0~5)趋势,其他林区和岭西林草交错区呈弱下降(-5~0)趋势,草原区越向西下降越明显(-25^-5);3)研究区北部森林区年NPP与生长季气温关系较密切,草原区NPP则主要受降水控制。

Vegetation net primary productivity and their response to climate change is one of the core contents of global change. Application of remote sensing,meteorological data and remote sensing model of energy efficiency,the spatial and temporal variations of NPP in Hulun Buir grass ecotone 1982- 2010 and its relationship with climatic factors were analyzed. Results show that：（ 1） The average of NPP of the Greater Khingan mountain gradually reduced along the EW direction,the minimum average of NPP was on The Hulunbeir Grassland（ 0- 350 g C·m- 2a- 1）,the maximum values of NPP were mainly distributed in the Great Khingan forest region（ 450- 520 g C·m- 2a- 1）;（ 2） Near 30 a the north- central area of the Greater Khingan mountains forest area of Pixel Size of NPP showed a trend of weak growth（ 0 to 5）,other forest regions and vegetations of woodland and meadow of the west of the Greater Khingan（- 5- 0） showed a weak falling trend,It was more obvious for the west than the east（ 25-- 5）;（ 3） The relationship between NPP and growing season temperatures in forest region of northern study area was relatively close,grassland area of NPP was mainly affected by precipitation control.