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中文摘要：
为分析呼兰河流域各种覆被叶面积指数(LAI)变化特征,应用1982—2000年的NOAA-AVHRR NDVI月数据,采用简单生物圈模型(SiB2)反演了呼兰河流域的LAI,并利用IGBP土地覆被数据将反演的LAI数据整理为10种覆被的LAI系列。对10种覆被LAI变化特征的分析结果表明:呼兰河流域10种覆被LAI在年内各月份间呈单峰变化,与气温、降水量等气象因子的季节变化规律相符,在年际间LAI呈波动变化,但不存在明显的增大或减小趋势;LAI系列与气象因子系列的相关性较强,以平均气温、水汽压、降水量为自变量,以LAI为因变量,建立了可估算各种覆被LAI的回归方程,为在NDVI数据缺失时段的呼兰河流域LAI估算提供了一种简便方法。
英文摘要：
The objective was to analyze the variation characteristics of leaf area index (LAI) of various covers in the Hulan River basin . LAI in the Hulan River basin was reversed monthly by the simple biosphere model (SiB2 ) using monthly data of NOAA‐AV HRR NDVI during 1982-2000 , and the achieved LAI data was processed to the LAI series for the vegetation covers of 10 kinds by using the IGBP land cover data .The variation characteristics of LAI for the 10 kinds of vegetation covers were analyzed , and the results indicated that monthly LAI represented a single peak in every year which matched up to the seasonal variation of temperature , precipitation and other meteorological factors ;LAI showed yearly fluctuation but no clear increasing or decreasing trend;and LAI series manifested a strong correlation with the series of meteorological factors . A regression equation was established for estimating LAI of the various vegetation covers by using mean temperature ,vapor pressure ,and precipitation as the independent variables and LAI as a dependent variable .A simple method for estimating LAI was therefore proposed in the period of lacking of NDVI data for the Hulan River basin .
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