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首页> 外文期刊>Journal of Geophysical Research. Biogeosciences >Warming-Induced Earlier Greenup Leads to Reduced Stream Discharge in a Temperate Mixed Forest Catchment
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Warming-Induced Earlier Greenup Leads to Reduced Stream Discharge in a Temperate Mixed Forest Catchment

机译：温暖诱导的早期绿色导致温带混合森林集水区中的流放电减少

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The phenological response of vegetation to ongoing climate change may have great implications for hydrological regimes in the eastern United States. However, there have been few studies that analyze its resultant effect on catchment discharge dynamics, separating from dominant climatic controls. In this study, we examined the net effect of phenological variations on the long-term and interannual gross primary production (GPP) and evapotranspiration (ET) fluxes in a temperate deciduous forest, as well as on the catchment discharge behavior in a mixed deciduous-conifer forest catchment. First, we calibrated the spring and autumn leaf phenology models for the Harvard Forest in the northeastern United States, where the onsets of greenup and senescence have been significantly advanced and delayed, 10.3 and 6.0 days respectively, over the past two decades (1992-2011). We then integrated the phenology models into a mechanistic watershed ecohydrological model (RHESSys), which improved the interannual and long-term simulations of both the plot-scale daily GPP and ET fluxes and the catchment discharge dynamics. We found that the phenological changes amplified the long-term increases in GPP and ET driven by the climatic controls. In particular, the earlier greenup onsets resulted in increases in annual ET significantly, while the delayed senescence onsets had less influence. Consequently, the earlier greenup onsets reduced stream discharge not only during the growing season but also during the following dormant season due to soil water depletion. This study highlights the importance of understanding vegetation response to ongoing climate change in order to predict the future hydrological nonstationarity in this region.
机译：植物对持续气候变化的鉴生响应可能对美国东部的水文制度产生巨大影响。然而，有很少的研究可以分析其对集水区排出动态的产生影响，与显性气候对照分离。在这项研究中，我们研究了在温带落叶林中的长期和年际初级产量（GPP）和蒸散（ET）通量的婴儿变化的净效应，以及混合落叶的集水区排出行为针叶树森林集水区。首先，我们校准了美国东北部的哈佛森林春秋叶候模型，在过去的二十年中，12.3和6.0天的绿化和衰老的持续升级和延迟延迟了10.3和6.0天（1992-2011 ）。然后，我们将候选模型纳入机械流域生态学模型（Rhessys），这改善了块级每日GPP和ET助熔剂和集水区排出动态的际期和长期仿真。我们发现诸如通过气候对照驱动的GPP和ET中的长期增长的酚类变化。特别是，早期的绿化on onsets导致每年的ET增加显着增加，而延迟的衰老造山卷曲的影响较小。因此，早期的绿化持续性不仅在生长季节期间减少了流放电，而且在由于土壤水耗尽导致的休眠季节也是如此。本研究突出了了解植被应对持续的气候变化的重要性，以预测该地区未来的水文非间抗性。

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