Article CC BY 4.0
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The mobilization and transport of newly fixed carbon are driven by plant water use in an experimental rainforest under drought

ORCID
0000-0001-5286-5645
Affiliation
Max Planck Institute for Biogeochemistry, Germany
Huang, Jianbei;
ORCID
0000-0002-0132-5785
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Ladd, S. Nemiah;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Ingrisch, Johannes;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Kübert, Angelika;
Affiliation
University of Arizona, School of Natural Resources and the Environment, USA
Meredith, Laura K.;
Affiliation
University of Arizona, Biosphere 2, USA
van Haren, Joost;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Bamberger, Ines;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Daber, L. Erik;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Kühnhammer, Kathrin;
Affiliation
University of Arizona, School of Natural Resources and the Environment, USA
Bailey, Kinzie;
Affiliation
University of Arizona, School of Natural Resources and the Environment, USA
Hu, Jia;
Affiliation
University of Arizona, Department of Environmental Science, USA
Fudyma, Jane;
Affiliation
University of Göttingen, Biogeochemistry of Agroecosystems, Germany
Shi, Lingling;
Affiliation
University of Göttingen, Biogeochemistry of Agroecosystems, Germany
Dippold, Michaela A.;
Affiliation
University of Innsbruck, Department of Ecology, Austria
Meeran, Kathiravan;
Affiliation
University of Arizona, Biosphere 2, USA
Miller, Luke;
ORCID
0000-0003-0943-8423
Affiliation
Estación Experimental de Zonas Áridas, Consejo Superior de Investigaciones Científcas, Spain
O’Brien, Michael J.;
Affiliation
Max Planck Institute for Biogeochemistry, Germany
Yang, Hui;
Affiliation
Max Planck Institute for Biogeochemistry, Germany
Herrera-Ramírez, David;
GND
1138584436
ORCID
0000-0002-9926-5484
Affiliation
Julius Kühn Institute (JKI), Institute for Forest Protection, Germany
Hartmann, Henrik;
Affiliation
Max Planck Institute for Biogeochemistry, Germany
Trumbore, Susan;
Affiliation
University of Innsbruck, Department of Ecology, Austria
Bahn, Michael;
Affiliation
Albert-Ludwig-University of Freiburg, Ecosystem Physiology, Germany
Werner, Christiane;
Affiliation
Swiss Federal Research Institute WSL, Switzerland
Lehmann, Marco M.

Non-structural carbohydrates (NSCs) are building blocks for biomass and fuel metabolic processes. However, it remains unclear how tropical forests mobilize, export, and transport NSCs to cope with extreme droughts. We combined drought manipulation and ecosystem 13CO2 pulse-labeling in an enclosed rainforest at Biosphere 2, assessed changes in NSCs, and traced newly assimilated carbohydrates in plant species with diverse hydraulic traits and canopy positions. We show that drought caused a depletion of leaf starch reserves and slowed export and transport of newly assimilated carbohydrates below ground. Drought effects were more pronounced in conservative canopy trees with limited supply of new photosynthates and relatively constant water status than in those with continual photosynthetic supply and deteriorated water status. We provide experimental evidence that local utilization, export, and transport of newly assimilated carbon are closely coupled with plant water use in canopy trees. We highlight that these processes are critical for understanding and predicting tree resistance and ecosystem fluxes in tropical forest under drought.

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License Holder: The Author(s) 2024.

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