Hydrologic resilience and Amazon productivity.

Hydrologic resilience and Amazon productivity.
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水文弹性和亚马逊生产力。

DOI:
10.1038/s41467-017-00306-z
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发表时间:
2017-08-30
影响因子:
16.6
通讯作者:
Jackson RB
Jackson RB
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Ahlström A;Canadell JG;Schurgers G;Wu M;Berry JA;Guan K;Jackson RB

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亚马逊雨林对全球碳储存和生物多样性至关重要。该系统耦合大气和土地,潮湿的森林依赖于对流来维持总初级生产力和增长。估计未来气候和植被的地球系统模型在亚马逊模拟中几乎没有一致性。在这里,我们表明,在内部产生的气候,主要是降水的偏见,解释了地球系统模型结果的不确定性的大部分;模型,经验数据和理论收敛时,降水偏差占。总的初级生产力,地上生物量和树木覆盖对齐的水文关系,断点在~2000毫米的年降水量,其中系统之间的水和辐射限制蒸散的过渡。断点在未来似乎相当稳定,表明亚马逊对气候变化的适应能力。因此,降水和土地利用的变化更有可能决定亚马逊河流域的生物量和植被结构。地球系统模型对亚马逊地区未来气候的模拟结果几乎没有一致性。在这里,作者表明,内部产生的气候偏差解释了这种不确定性的大部分,水饱和和水限制蒸散之间的平衡控制着亚马逊对气候变化的适应力。
The Amazon rainforest is disproportionately important for global carbon storage and biodiversity. The system couples the atmosphere and land, with moist forest that depends on convection to sustain gross primary productivity and growth. Earth system models that estimate future climate and vegetation show little agreement in Amazon simulations. Here we show that biases in internally generated climate, primarily precipitation, explain most of the uncertainty in Earth system model results; models, empirical data and theory converge when precipitation biases are accounted for. Gross primary productivity, above-ground biomass and tree cover align on a hydrological relationship with a breakpoint at ~2000 mm annual precipitation, where the system transitions between water and radiation limitation of evapotranspiration. The breakpoint appears to be fairly stable in the future, suggesting resilience of the Amazon to climate change. Changes in precipitation and land use are therefore more likely to govern biomass and vegetation structure in Amazonia. Earth system model simulations of future climate in the Amazon show little agreement. Here, the authors show that biases in internally generated climate explain most of this uncertainty and that the balance between water-saturated and water-limited evapotranspiration controls the Amazon resilience to climate change.
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影响因子: 30.7
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期刊: PHYSICS AND CHEMISTRY OF THE EARTH PART B-HYDROLOGY OCEANS AND ATMOSPHERE
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