【摘要】 为验证生态系统模型Biome-BGC在流域尺度的适用性,以小浪底—花园口区间(小花间)洛河上游卢氏水文站以上流域作为研究区进行探讨。应用Biome-BGC计算研究区4种自然植被净初级生产力(NPP)的空间分布,并于2004年7月在卢氏县东安林场用LI-6400便携式光合仪进行日光合作用测量。结果表明:研究区植被的年总净初级生产力为1 90067×1012gC;落叶阔叶林、常绿针叶林、灌木林和草地的年净初级生产力分别为603 2gCm-2a-1、416 1gCm-2a-1、263 8gCm-2a-1、149 2gCm-2a-1;研究区东部山区及河谷地区、西部山区的植被净初级生产力较高,中部地区较低;与测量结果相比,常绿针叶林的日光合值接近模型的输出值,落叶阔叶林和灌木林的日光合值小于模型的输出值,草地的年净初级生产力大于模型的输出值。该模型较好地拟合了研究区植被生产力的空间特征,对中小尺度的流域模拟有很好的适用性。更多还原

【Abstract】 To validate biogeochemical model Biome-BGC in basin scale,taking the basin upward Lushi hydrologic station in the upper Luohe River which was in Xiaohuajian （Xiaolangdi-Huayuankou） section of the Yellow River Basin as the study area,this paper discussed the simulated net primary production（NPP） spatial distribution with the comparison of site experiments.Net primary production and spatial distribution of four types of vegetation were estimated with Biome-BGC.Measurement was carried out in the early July by LI-6400 Portable Photosynthesis System for the daily photosynthesis of three biome types.The measured value was compared with the output of the model.The total annual NPP of all vegetation types in the study area was 1.90067×10¹² gC,the average annual NPP were 603.2 gCm^-2a^-1,416.1 gCm^-2a^-1,263.8 gCm^-2a^-1,149.2gCm^-2a^-1 for deciduous broadleaf forest,evergreen needle leaf forest,shrub and grassland respectively.The measured value of daily photosynthesis of needle leaf forest was very close to the output of Biome-BGC,but the measured photosynthesis of deciduous broadleaf forest and shrub was much lower compared with the output of the model because of the changeable weather,and the harvested annual grassland NPP was higher than the model’s output.The model well captured the spatial characters of the study area,and it can be used to simulate vegetation dynamic variations in the middle basin scale.更多还原