基于生态过程模型的哈尔滨市净初级生产力模拟和分析

净初级生产力(NPP)是衡量陆地生态系统碳源(汇)的重要参数,为准确模拟城市NPP及研究城市NPP空间分布特征。以哈尔滨市为研究对象,以Landsat-5 TM遥感数据、MODIS的叶面积指数(LAI)数据和气象要素等资料为基础数据,采用基于过程的北部森林生态系统生产力模拟模型(BEPS),模拟获得哈尔滨市NPP空间分布特征图,并对NPP时空变化进行分析。结果表明:哈尔滨北部及西南部NPP整体比较高,哈尔滨西部及东北部NPP整体比较低,主要与研究区土地覆盖类型有关。哈尔滨市2011年NPP积累总量为2.427×1013g·a-1,NPP年平均值为511 g·m~(-2)·a~(-1)。哈尔滨市NPP积累主要在7、8月份,NPP年积累值在7月份达到最高值。通过采用通量数据及MODIS的NPP产品验证可知,BEPS模型能够较好地估算哈尔滨市植被NPP。为揭示城市NPP变化的影响因素(气候、地域等)提供技术支持,也可为城市生态建设提供参考。

Simulation and Analysis of Net Primary Productivity in Harbin with Ecological Process Model

With Landsat-5 TM remote sensing data, MODIS LAI data and meteorological data in Harbin, we built the simulation model of productivity in forest ecosystems based on process simulation (BEPS), NPP spatial distribution map of Harbin City, and analyzed the spatial-temporal changes of NPP.The values of net primary productivity (NPP) in the north and southwest of Harbin were relatively high, and the NPP values in the west and northeast of Harbin were relatively low.In Harbin, in 2011 NPP cumulative total was 2.427×1013g/a, NPP average was 511g/(m2·a).NPP of Harbin accumulated mainly in July and August, and the cumulative value of NPP reached the highest value in July.The BEPS model can be used to estimate the vegetation NPP in Harbin by using flux data and NPP MODIS.