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在复杂的气候变化条件下,利用水碳耦合模型进行生态水文学研究成为主要的研究手段和途径。该文以杂谷脑河上游流域为例,在确定生态水文模型WaSSI-C模拟尺度的基础上,探讨水碳耦合模型在中国西南湿润地区的适用性。杂古脑河上游流域位于岷江上游,隶属于长江流域。在分析和讨论了模型结构和机理的基础上,分别对模型蒸散和融雪计算进行了补充改进,以提高模型的适用性。将1988–1996年作为模型的率定期,1997–2006年作为模型的验证期,分别在率定期和验证期利用实测的径流数据和中分辨率成像光谱仪数据的总初级生产力、蒸散(ET)数据,对模拟结果进行对比验证。并利用决定系数(R2)和Nash-Sutcliffe效率系数(NS)两个指标对模拟效果进行评价。流域总径流率定期和验证期对比验证的R2分别为0.86和0.78;NS分别为0.82和0.67。总生态系统生产力和ET验证期的R2分别为0.89和0.78。可见模型模拟结果的两个评价指标都处于较为理想的区间内,说明WaSSI-C模型在研究区内具有较好的适用性。并对模型的蒸散计算方法进行了讨论,在此基础上提出了模型中存在的问题和改进的方向。
Under the complex climate change conditions, the use of water-carbon coupling model for ecological hydrology research has become the main research methods and ways. Taking the upper valley of Zagunao River as an example, based on the WaSSI-C simulation scale of the eco-hydrological model, this paper discusses the applicability of the water-carbon coupling model in the moist southwest of China. Gulou upstream basin is located in the upper reaches of the Minjiang River, part of the Yangtze River. Based on the analysis and discussion of the structure and mechanism of the model, the model evapotranspiration and snowmelt calculation are respectively supplemented and improved to improve the applicability of the model. Periodicity from 1988 to 1996 was used as a model, and from 1997 to 2006 were used as validation periods for the model, using total primary productivity and evapotranspiration (ET) data from measured runoff and mid-resolution imaging spectrometer data in rate and validation periods, respectively , The simulation results were compared and verified. The simulation results were evaluated using two determinants of the coefficient of determination (R2) and the Nash-Sutcliffe efficiency coefficient (NS). The R2 of the total catchment runoff and the validation period were 0.86 and 0.78, respectively, and the NS were 0.82 and 0.67, respectively. R2 of total ecosystem productivity and ET validation period were 0.89 and 0.78, respectively. The two evaluation indexes of the model simulation results are in the ideal range, indicating that the WaSSI-C model has good applicability in the study area. And the evapotranspiration calculation method of the model is discussed. Based on this, the existing problems in the model and the direction of improvement are put forward.