流域土壤有效厚度水平衡验证及其对陆面水碳通量模拟的影响
发布时间：2018-09-03 19:08
【摘要】：由于土壤特性和植被分布具有区域性,不同流域土壤有效厚度存在差异,进而影响土壤蓄水容量和陆面水碳等通量的时空分布。以湿润地区的东江流域,湿润、半湿润地区的淮河流域以及半湿润、半干旱地区的泾河流域为研究对象,采用LPJ动态植被模型,以水量平衡为目标率定土壤有效厚度,分析不同气候区典型流域土壤有效厚度以及土壤蓄水容量和陆面水碳通量(径流量R,实际蒸散发量ET和净初级生产力NPP)变化。结果表明:东江、淮河、泾河流域的土壤有效厚度分别为70 cm、90 cm和140 cm,土壤有效厚度和蓄水容量随着气候干旱程度增加而增加;土壤有效厚度的修正有效减低该模型水平衡误差,对陆面水碳通量模拟结果的影响程度与区域气候条件有关,湿润地区多年平均径流深和实际蒸散发修正前后变化显著,半湿润、半干旱地区NPP变化显著。研究成果为提高LPJ模型在不同气候区应用可靠性提供参考依据。
[Abstract]:Because of the regional characteristics of soil and vegetation distribution, there are differences in the effective thickness of soil in different watersheds, thus affecting the spatial and temporal distribution of soil water storage capacity and land surface water carbon flux. Taking the Dongjiang River Basin, the Huaihe River Basin in the humid, the Huaihe River Basin in the Semi-humid region and the Jinghe River Basin in the Semi-humid and Semi-arid areas as the research objects, the LPJ dynamic vegetation model was used to determine the effective soil thickness with the water balance as the target rate. The changes of soil available thickness, soil water storage capacity and land surface water carbon flux (runoff R, actual evapotranspiration (ET) and net primary productivity (NPP) in different climatic regions were analyzed. The results showed that the available soil thickness and water storage capacity of Dongjiang, Huaihe and Jing rivers were 70 cm,90 cm and 140 cm, respectively. The correction of soil effective thickness can effectively reduce the water balance error of the model, and the influence degree on the simulation results of land surface water carbon flux is related to the regional climate conditions. The annual average runoff depth and actual evapotranspiration in humid areas change significantly before and after the correction. The change of NPP in semi-humid and semi-arid areas was significant. The results provide a reference for improving the reliability of LPJ model in different climate regions.
【作者单位】： 河海大学水文水资源与水利工程科学国家重点实验室水文水资源学院;
【基金】：国家自然科学基金重大项目(51190091)~~
【分类号】：S152.7
，
本文编号：2220901
[Abstract]:Because of the regional characteristics of soil and vegetation distribution, there are differences in the effective thickness of soil in different watersheds, thus affecting the spatial and temporal distribution of soil water storage capacity and land surface water carbon flux. Taking the Dongjiang River Basin, the Huaihe River Basin in the humid, the Huaihe River Basin in the Semi-humid region and the Jinghe River Basin in the Semi-humid and Semi-arid areas as the research objects, the LPJ dynamic vegetation model was used to determine the effective soil thickness with the water balance as the target rate. The changes of soil available thickness, soil water storage capacity and land surface water carbon flux (runoff R, actual evapotranspiration (ET) and net primary productivity (NPP) in different climatic regions were analyzed. The results showed that the available soil thickness and water storage capacity of Dongjiang, Huaihe and Jing rivers were 70 cm,90 cm and 140 cm, respectively. The correction of soil effective thickness can effectively reduce the water balance error of the model, and the influence degree on the simulation results of land surface water carbon flux is related to the regional climate conditions. The annual average runoff depth and actual evapotranspiration in humid areas change significantly before and after the correction. The change of NPP in semi-humid and semi-arid areas was significant. The results provide a reference for improving the reliability of LPJ model in different climate regions.
【作者单位】： 河海大学水文水资源与水利工程科学国家重点实验室水文水资源学院;
【基金】：国家自然科学基金重大项目(51190091)~~
【分类号】：S152.7
，
本文编号：2220901
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