摘要
借鉴了MODIS-PSN、CASA、GLO-PEM、VPM等光能利用率NPP模型的优点,同时充分考虑了研究区域其植被光能利用率和环境因素的典型特点。根据研究区域相关文献资料和NPP实测数据,模拟出主要植被类型的最大光能利用率。同时,特别细化了草地和灌丛最大光能利用率的估算步骤。采用蒸散比算法和陆地生态模型(TEM),根据Liebig定律,计算了对最大光能利用率产生影响的环境综合胁迫因子。估算了青海省主要植被类型的光能利用率,并详细分析了其空间分布和季相变化特征。结果表明:2006年青海省植被平均光能利用率介于0.026-0.403gC/MJ之间,平均值为0.096gC/MJ。青海省植被光能利用率的分布具有明显的地带性,呈由西北向东南逐渐递增的趋势。其随季节的推移变化比较明显,2006年植被月平均光能利用率在0.057-0.157gC/MJ之间,峰值出现在7月份,主要的光能利用率累积发生在5-9月份。
In this paper,advantages of MODIS-PSN,CASA,GLO-PEM,VPM model based on light use efficiency（LUE）are used for reference,and typical characteristics of vegetation LUE and environment in the study area are taking into account.Based on relative literature and measured NPP,the maximum LUE values of main vegetation in the study area are simulated.The maximum LUE values of grassland and shrubland are calculated through three steps in order to reduce calculating errors.Based on Beer＇s law,environmental stress factors of LUE is calculated by evaporative fraction algorithm and TEM model.The LUE values of main vegetation in Qinghai province are simulated,and their spatial distributions and dynamic changes are analyzed.The result indicates that the mean LUE value ranges from 0.026gC/MJ to 0.403gC/MJ in 2006 in Qinghai province,and the average is 0.096gC/MJ.The LUE of Vegetation with obvious zone distributions gradually increases from north-west to south-east.The LUE value in Qinghai province largely varies with the season.The monthly mean LUE of vegetation changes from 0.057gC/MJ to 0.157gC/MJ in 2006,and the highest appears in July.The main accumulative period of LUE is from May to September.
出处
《生态学报》
CAS
CSCD
北大核心
2010年第19期5209-5216,共8页
Acta Ecologica Sinica
基金
辽宁省教育厅人文社会科学研究项目(2007T095)
辽宁省教育厅科学研究一般项目(L2010226)
教育部人文社会科学重点研究基地项目(08JJD790142)
国家重点基础研究发展规划(973)项目(2007CB714406)
关键词
光能利用率
植被
遥感
时空变化
青海省
light use efficiency
vegetation
remote sensing
spatio-temporal variation
Qinghai province
