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森林蒸散包括植被蒸腾、土壤蒸发、冠层截留蒸发三个组分,在陆地生态系统水分循环及能量流动研究中占有重要地位。论文基于Priestley-Taylor Jet Propulsion Laboratory Model(PT-JPL)模型,估算温带针阔混交林、人工常绿针叶林、亚热带常绿阔叶林三个典型森林生态系统2003—2008年蒸散(组分);在模拟结果基础上揭示了蒸散(组分)的季节变异规律及主控因子。结果表明:1PT-JPL模型在中国东部森林生态系统蒸散及其组分估算中具有较高的稳定性和可靠性;2蒸散(组分)季节变化特征明显,不同森林生态系统类型变化规律差异较小,但主控因子存在较大差异:温带针阔混交林蒸散和植被蒸腾季节变异主要由净辐射和增强植被指数(EVI)共同控制,而亚热带人工常绿针叶林和亚热带常绿阔叶林主要受净辐射影响;EVI和饱和水汽压差(VPD)是土壤蒸发季节变异的主控因子,截留蒸发的季节变化则主要受VPD影响。
Forest evapotranspiration includes three components of vegetation transpiration, soil evaporation and canopy interception evaporation, which play an important role in the study of water cycle and energy flow of terrestrial ecosystems. In this paper, based on the Priestley-Taylor Jet Propulsion Laboratory Model (PT-JPL) model, three typical forest ecosystems, including temperate coniferous-broadleaved mixed forest, artificial evergreen coniferous forest and subtropical evergreen broad-leaved forest, ). Based on the simulation results, seasonal variations and main control factors of evapotranspiration (components) were revealed. The results show that the 1PT-JPL model has high stability and reliability in the estimation of forest ecosystem evapotranspiration and its components in eastern China. 2 The seasonal variations of evapotranspiration (components) are obvious, and the differences of different types of forest ecosystems But the main controlling factors were quite different. The seasonal variations of evapotranspiration and vegetation transpiration in temperate coniferous and broad-leaved mixed forests were mainly controlled by net radiation and enhanced vegetation index (EVI), while those in subtropical artificial evergreen coniferous forests and subtropical evergreen broad-leaved forests The forest is mainly affected by the net radiation. The EVI and the saturated water vapor pressure difference (VPD) are the main controlling factors of seasonal variation of soil evaporation. The seasonal variation of interception evaporation is mainly affected by VPD.