Ecosystem fluxes during drought and recovery in an experimental forest

Werner, Christiane; Meredith, Laura K.; Ladd, S. Nemiah; Ingrisch, Johannes; Kübert, Angelika; van Haren, Joost; Bahn, Michael; Bailey, Kinzie; Bamberger, Ines; Beyer, Matthias; Blomdahl, Daniel; Byron, Joseph; Daber, Erik; Deleeuw, Jason; Dippold, Michaela A.; Fudyma, Jane; Gil-Loaiza, Juliana; Honeker, Linnea K.; Hu, Jia; Huang, Jianbei; Klüpfel, Thomas; Krechmer, Jordan; Kreuzwieser, Jürgen; Kühnhammer, Kathrin; Lehmann, Marco M.; Meeran, Kathiravan; Misztal, Pawel K.; Ng, Wei-Ren; Pfannerstill, Eva; Pugliese, Giovanni; Purser, Gemma; Roscioli, Joseph; Shi, Lingling; Tfaily, Malak; Williams, Jonathan. 2021 Ecosystem fluxes during drought and recovery in an experimental forest. Science, 374 (6574). 1514-1518. 10.1126/science.abj6789

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Official URL: http://dx.doi.org/10.1126/science.abj6789

Abstract/Summary

Severe droughts endanger ecosystem functioning worldwide. We investigated how drought affects carbon and water fluxes as well as soil-plant-atmosphere interactions by tracing 13CO2 and deep water 2H2O label pulses and volatile organic compounds (VOCs) in an enclosed experimental rainforest. Ecosystem dynamics were driven by different plant functional group responses to drought. Drought-sensitive canopy trees dominated total fluxes but also exhibited the strongest response to topsoil drying. Although all canopy-forming trees had access to deep water, these reserves were spared until late in the drought. Belowground carbon transport was slowed, yet allocation of fresh carbon to VOCs remained high. Atmospheric VOC composition reflected increasing stress responses and dynamic soil-plant-atmosphere interactions, potentially affecting atmospheric chemistry and climate feedbacks. These interactions and distinct functional group strategies thus modulate drought impacts and ecosystem susceptibility to climate change.

Item Type:	Publication - Article
Digital Object Identifier (DOI):	10.1126/science.abj6789
UKCEH and CEH Sections/Science Areas:	Atmospheric Chemistry and Effects (Science Area 2017-)
ISSN:	0036-8075
NORA Subject Terms:	Ecology and Environment
Date made live:	12 Apr 2022 13:47 +0 (UTC)
URI:	https://nora.nerc.ac.uk/id/eprint/532481

Item Type:

Publication - Article

Digital Object Identifier (DOI):

10.1126/science.abj6789

UKCEH and CEH Sections/Science Areas:

Atmospheric Chemistry and Effects (Science Area 2017-)

ISSN:

0036-8075

NORA Subject Terms:

Ecology and Environment

Date made live:

12 Apr 2022 13:47 +0 (UTC)