Drought legacies are dependent on water table depth, wood anatomy and drought timing across the eastern US
Drought legacies are dependent on water table depth, wood anatomy and drought timing across the eastern US
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DOI：
10.1111/ele.13173
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发表时间：
2019-01-01
期刊：
影响因子：
8.8
通讯作者：
Phillips, Richard P.
中科院分区：
文献类型：
--
作者：
Kannenberg, Steven A.;Maxwell, Justin T.;Phillips, Richard P.
严重干旱可通过阻碍树木恢复和抑制整个森林的碳吸收的滞后效应，给森林生态系统带来长期的遗产。然而，影响温带森林干旱遗产的当地气候和土壤因素仍然未知。在这里，我们将美国东部中部森林的143个年轮年表与历史气候和当地土壤属性配对。我们发现，遗留影响是广泛的，在扩散的多孔物种、地下水位较深的地点以及对季末干旱(8-9月)的反应中，影响的幅度显著增加。利用一系列缩小规模的气候预测，我们还表明，到本世纪末，我们的地点预计将大幅增加缺水和干旱频率，潜在地将遗留影响的规模增加高达65%，并成为塑造森林组成、碳吸收和死亡率的重要过程。
Severe droughts can impart long-lasting legacies on forest ecosystems through lagged effects that hinder tree recovery and suppress whole-forest carbon uptake. However, the local climatic and edaphic factors that interact to affect drought legacies in temperate forests remain unknown. Here, we pair a dataset of 143 tree ring chronologies across the mesic forests of the eastern US with historical climate and local soil properties. We found legacy effects to be widespread, the magnitude of which increased markedly in diffuse porous species, sites with deep water tables, and in response to late-season droughts (August-September). Using an ensemble of downscaled climate projections, we additionally show that our sites are projected to drastically increase in water deficit and drought frequency by the end of the century, potentially increasing the size of legacy effects by up to 65% and acting as a significant process shaping forest composition, carbon uptake and mortality.