广泛但不同的干旱遗产对总初级生产力的影响

Xin Yu, Rene Orth, Markus Reichstein, Michael Bahn, Christian Reimers, Ulisse Gomarasca, Mirco Migliavacca, Dario Papale, Ana Bastos
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引用次数: 0

摘要

干旱可以同时影响陆地生态系统,但作为遗留效应在时间上滞后。尽管干旱对植物的影响已经通过树的径向生长和绿度得到了充分的展示,但对干旱对总初级生产力(GPP)的影响的理解仍然有限。在这里,我们首次量化了73个生物群系和气候区长期涡动相关点的干旱遗留对GPP的影响。我们在59个经历严重干旱的地点中,有57个发现了相当大且广泛的干旱遗留影响。我们发现干旱遗留影响在全球范围内存在差异,大约有同样多的地点经历了积极的(30个地点)和消极的(27个地点)遗留影响。草地倾向于表现出积极的遗留效应,干旱后GPP受到刺激,而其他生态系统如森林则表现出积极、消极或没有遗留效应的混合效应。我们发现气候干旱和干旱持续时间是解释干旱遗产效应空间变异性的最相关因素。我们的研究结果表明,干旱对GPP的影响是广泛而分散的,应该更明确地考虑干旱对陆地碳循环的影响。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Widespread but divergent drought legacy effects on gross primary productivity
Abstract Droughts can impact terrestrial ecosystems concurrently but also lagged in time as legacy effects. Although drought legacy effects on plants have been thoroughly shown using tree radial growth and greenness, understanding of legacy effects on gross primary productivity (GPP) remains limited. Here, we quantify for the first time drought legacy effects on GPP at 73 long-term eddy covariance sites across biomes and climate regions. We find sizeable and widespread drought legacy effects at 57 out of 59 sites experiencing strong droughts. We find drought legacy effects diverge globally, with about as many sites experiencing positive (30 sites) and negative (27 sites) legacy effects. Grasslands tend to exhibit positive legacy effects, with GPP being stimulated after drought, whereas other ecosystems such as forests show a mixture of positive, negative, or no legacy effects. We find climatological aridity and drought duration to be the most relevant factors explaining spatial variability of drought legacy effects among forest sites. Our results demonstrate that drought legacy effects on GPP are widespread but divergent and should be considered more explicitly for understanding and projecting the impacts of drought on terrestrial carbon cycling.
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