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. 2020 Sep 7;375(1810):20190516. doi: 10.1098/rstb.2019.0516

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© 2020 The Authors.

Published by the Royal Society under the terms of the Creative Commons Attribution License http://creativecommons.org/licenses/by/4.0/, which permits unrestricted use, provided the original author and source are credited.

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Figure 1. — (a) Geographic locations of flux sites; spruce—yellow, pine—green, mixed forests—red and beech—orange. (b) Map of SPEI 6-month drought index from Global Drought Monitor (https://spei.csic.es/map/maps.html) [21] during the summer of 2018 (April–September). Bottom: SPEI drought scale where dark red is the most severe drought conditions. (Online version in colour.)