中国区域植被叶面积指数时空分布——机理模型模拟与遥感反演比较  

The spatial-temporal distribution of leaf area index in China: a comparison between ecosystem modeling and remote sensing reversion

作　　者：黄玫[1] 季劲钧[1,2] 

机构地区：[1]中国科学院地理科学与资源研究所生态网络观测与模拟重点实验室,北京100101 [2]中国科学院大气物理研究所,北京100029

出　　处：《生态学报》2010年第11期3057-3064,共8页Acta Ecologica Sinica

基　　金：国家自然科学基金资助项目(30590384);国家科技支撑计划资助项目(2007BAC03A11-01);中国科学院知识创新工程重要方向资助项目(KZCX2-YW-219);中国科学院地理科学与资源研究所创新三期领域前沿资助项目(066U0607SZ)

摘　　要：叶面积指数是表征植被冠层特征的重要参数,同时也是决定生态系统净初级生产力的重要因子,它对全球变化和生态系统碳循环研究具有重要意义。目前大范围的叶面积指数只能通过遥感反演和机理模型模拟获得,而通过这两种方法获取的叶面积指数都存在一定的不确定性。利用大气-植被相互作用模型(AVIM2)在0.1°×0.1°经纬度网格上模拟产生了中国区域叶面积指数并与两套使用不同遥感反演方法生成的叶面积指数在空间分布和季节变化特征方面进行了比较。通过比较说明中国区域植被叶面积指数分布主要受水分条件限制,整体呈现东南部高西北部低的趋势。中国区域植被生长的季节变化受季风影响显著,与气温及地表太阳辐射的季节变化趋势相一致。中国区域叶面积指数整体呈现夏季高、春秋季次之而冬季低的趋势。Leaf area index（LAI） is an important parameter to characterize the canopy characteristics.It has significant influence on ecosystem carbon cycle researches since its critical factor to determine ecosystem net primary productivity.The large scale leaf area index can be obtained by both remote sensing reversion and ecosystem modeling though uncertainties exist in the two methods.The atmosphere-vegetation interaction model（AVIM2） was used in this study to generate China-wide leaf area index at the resolution of 0.1 grid degree.The spatial distribution and seasonal cycles of model-generated LAI were compared with two datasets.One is satellite-derived LAI which was deduced by Myneni（1997） based on the physical principles of radiative transfer in vegetation and atmosphere.The other was deduced by Hagemann（2002） based on Advanced Very High Resoulution Radiometer（AVHRR） dataset by using heuristic corrective method.Hagemann′s dataset has being wildly used in general circulation models（GCMs）.The comparison shows that the spatial distribution of China′s vegetation LAI is mainly restricted by water conditions,which appears an overall trend of high in southeast and low in northwest.The seasonal cycle of China′s LAI is closely correlated with the monsoon′s movement in a year.It is identical with seasonal variation trends of temperature and surface solar radiation.The seasonal cycle of LAI in China-wide appears a trend of high in summer,moderate in spring and autumn and low in winter.

关 键 词：叶面积指数 AVIM2 遥感反演 样带 中国区域 

分 类 号：TP79[自动化与计算机技术—检测技术与自动化装置]