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A simulation model of net primary production at watershed scale in the hilly area of Loess Plateau, China

文献类型： 会议论文

第一作者： Hongmei Xu

作者： Hongmei Xu 1 ; Qingzhu Gao 2 ; Yongmei Huang 3 ;

作者机构： 1.National Climate Center, Laboratory for Climate Studies of China Meteorological Administration, Beijing, 100081

2.Institute of Agricultural Environment and Sustainable Development, Chinese Academy of Agricultural Sciences, Beijing 100081

3.College of Resource Science and Technology of Beijing Normal University, Key Laboratory of Environmental Change and Natural Disasters, Ministry of Education of China, Beijing, 10087

关键词： Stomatal Conductance;Net Primary Production;Soil Water Dynamic;Simulation Model;Hilly area of Loess Plateau

会议名称： Remote sensing and modeling of ecosystems for sustainability III :

主办单位：

页码： 62980Q-1-62980Q-10

摘要： A vegetation-soil-integrated-model (VSIM) to simulate net primary production at watershed scale was developed to explore the effect of soil water dynamic on the primary production processes in arid and semi-arid in northwest China. The model coupled a soil water dynamic module and a vegetation growth module. The former is a daily time step, multi-horizon and distributed spatial model. The later included a mechanism model of stomatal conductance based on the mechanical character of guard cell, which used to reflect both the influence of soil water potential to stomatal conductance and the stomatal control to net photosynthesis and transpiration processes at leaf scale. Scaling up to canopy and watershed scale through considered the effect of canopy structure and heterogeneity of topography. The main inputs of the model includes photosynthetic characteristics of main vegetation type, metrological data, soil texture and physical properties, and DEM. The outputs are soil water of 4 soil layers, evaporation, transpiration, runoff, net primary production and biomass of leaf, stem and root. The model was used in Zhifanggou watershed, which located in forest steppe zone and belonged to hilly area of Loess Plateau, and the model validation was tested by field observation data sets and RS data sets. In the modeling experiment, simulations show to provide good approximation with field observation data. The simulated biomass of grass and sub-shrub are better than that of arbor and shrub, and the dynamic of LAI have well coherence with the results calculated by Landsat TM data. The model could reflect the processes of precipitation-runoff at the watershed, and indicate the spatio-temporal changes of soil water content.

分类号： N5

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