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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。
Due to the regional characteristics of soil characteristics and vegetation distribution, the effective thickness of soil in different watersheds is different, which affects the spatial and temporal distribution of soil water storage capacity and carbon flux in land surface. Taking the Dongjiang River wetland, the Huaihe River basin in the humid and semi-humid area and the Jinghe River basin in the semi-humid and semi-arid area as the research object, the LPJ dynamic vegetation model was adopted to determine the soil effective thickness with the water balance as the target, and the effects of different climate The soil available thickness, the soil water storage capacity, and the variation of carbon flux (surface runoff, actual evapotranspiration ET and net primary productivity NPP) of land-surface waters in the typical watershed were analyzed. The results showed that the effective soil thickness of Dongjiang, Huaihe and Jinghe watersheds was 70 cm, 90 cm and 140 cm, respectively. The effective thickness and storage capacity of soil increased with the increase of climate aridity. The correction of effective soil thickness reduced the model effectively The effect of water balance error on the simulation results of land-surface water carbon flux was related to the regional climatic conditions. The mean runoff depth of multi-year wetlands and the change of actual evapotranspiration were significant before and after correction. The NPP changes in semi-humid and semi-arid regions were significant. The research results provide references for improving the reliability of LPJ model in different climatic zones.