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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >BIOME-BGC SIMULATIONS OF STAND HYDROLOGIC PROCESSES FOR BOREAS
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BIOME-BGC SIMULATIONS OF STAND HYDROLOGIC PROCESSES FOR BOREAS

机译：流域标准水文过程的生物学-BGC模拟

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BIOME-BGC is a general ecosystem model designed to simulate hydrologic across multiple scales, The objectives of this investigation were to compare BIOME-BGC estimates of hydrologic processes with observed data for different boreal forest stands and investigate factors that control simulated water fluxes. Model results explained 62 and 98% of the respective variances in observed daily evapotranspiration and soil water; simulations of the onset of spring thaw and the dates of snowpack disappearance and accumulation also generally tracked observations, Differences between observed and simulated evapotranspiration were attributed to model assumptions of constant, growing season, overstory leaf areas that did not account for phenological changes and understory effects on stand daily water fluxes. Vapor pressure deficit and solar radiation accounted for 58-74% of the variances in simulated daily evapotranspiration during the growing season, though low air temperature and photosynthetic light levels were found to be the major limiting factors regulating simulated canopy conductances to water vapor, Humidity and soil moisture were generally not low enough to induce physiological water stress in black spruce stands, though low soil water potentials resulted in approximate 34% reductions in simulated mean daily canopy conductances for aspen and jack pine stands. The sensitivity of evapotranspiration simulations to leaf area (LAI) was less than expected because of opposing responses of transpiration and evaporation to LAI, The results of this investigation identify several components within boreal forest stands that are sensitive to climate change. [References: 34]
机译：BIOME-BGC是一个通用的生态系统模型，旨在模拟多尺度的水文。本研究的目的是将BIOME-BGC对水文过程的估计与不同北方森林林分的观测数据进行比较，并研究控制模拟水通量的因素。模型结果解释了每日蒸散量和土壤水分各自变化的62％和98％;春季融化过程的模拟以及积雪消失和积聚的日期的模拟通常也可以跟踪观察到的结果。观测到的蒸发蒸腾量与模拟的蒸散量之间的差异归因于模型假设，这些假设是恒定的，生长季节，未结实的叶面积，而不考虑物候变化和林下效应站在每天的水通量上。尽管发现低气温和光合光水平是调节模拟冠层电导率对水蒸气，湿度和湿度的主要限制因素，但蒸气压亏空和太阳辐射占生长季节模拟日蒸散量变化的58-74％。土壤水分通常不足以诱发黑云杉林分的生理水分胁迫，尽管土壤水势低会导致白杨和杰克松林分的模拟平均日冠层电导率降低约34％。蒸散模拟对叶面积（LAI）的敏感性低于预期，因为蒸腾和蒸发对LAI的响应相反。这项调查的结果确定了北方森林林分中对气候变化敏感的几个成分。 [参考：34]

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