【摘要】：由于土壤特性和植被分布具有區(qū)域性,不同流域土壤有效厚度存在差異,進而影響土壤蓄水容量和陸面水碳等通量的時空分布。以濕潤地區(qū)的東江流域,濕潤、半濕潤地區(qū)的淮河流域以及半濕潤、半干旱地區(qū)的涇河流域為研究對象,采用LPJ動態(tài)植被模型,以水量平衡為目標(biāo)率定土壤有效厚度,分析不同氣候區(qū)典型流域土壤有效厚度以及土壤蓄水容量和陸面水碳通量(徑流量R,實際蒸散發(fā)量ET和凈初級生產(chǎn)力NPP)變化。結(jié)果表明:東江、淮河、涇河流域的土壤有效厚度分別為70 cm、90 cm和140 cm,土壤有效厚度和蓄水容量隨著氣候干旱程度增加而增加;土壤有效厚度的修正有效減低該模型水平衡誤差,對陸面水碳通量模擬結(jié)果的影響程度與區(qū)域氣候條件有關(guān),濕潤地區(qū)多年平均徑流深和實際蒸散發(fā)修正前后變化顯著,半濕潤、半干旱地區(qū)NPP變化顯著。研究成果為提高LPJ模型在不同氣候區(qū)應(yīng)用可靠性提供參考依據(jù)。
[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.
【作者單位】： 河海大學(xué)水文水資源與水利工程科學(xué)國家重點實驗室水文水資源學(xué)院;
【基金】：國家自然科學(xué)基金重大項目(51190091)~~
【分類號】：S152.7
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本文編號：2220901