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Drought and recovery effects on belowground respiration dynamics and the partitioning of recent carbon in managed and abandoned grassland.

Authors
  • Ingrisch, Johannes1
  • Karlowsky, Stefan2, 3
  • Hasibeder, Roland1
  • Gleixner, Gerd2
  • Bahn, Michael1
  • 1 Department of Ecology, University of Innsbruck, Innsbruck, Austria. , (Austria)
  • 2 Max Planck Institute for Biogeochemistry, Jena, Germany. , (Germany)
  • 3 Leibniz-Institute of Vegetable and Ornamental Crops, Großbeeren, Germany. , (Germany)
Type
Published Article
Journal
Global Change Biology
Publisher
Wiley (Blackwell Publishing)
Publication Date
Aug 01, 2020
Volume
26
Issue
8
Pages
4366–4378
Identifiers
DOI: 10.1111/gcb.15131
PMID: 32343042
Source
Medline
Keywords
Language
English
License
Unknown

Abstract

The supply of soil respiration with recent photoassimilates is an important and fast pathway for respiratory loss of carbon (C). To date it is unknown how drought and land-use change interactively influence the dynamics of recent C in soil-respired CO2 . In an in situ common-garden experiment, we exposed soil-vegetation monoliths from a managed and a nearby abandoned mountain grassland to an experimental drought. Based on two 13 CO2 pulse-labelling campaigns, we traced recently assimilated C in soil respiration during drought, rewetting and early recovery. Independent of grassland management, drought reduced the absolute allocation of recent C to soil respiration. Rewetting triggered a respiration pulse, which was strongly fuelled by C assimilated during drought. In comparison to the managed grassland, the abandoned grassland partitioned more recent C to belowground respiration than to root C storage under ample water supply. Interestingly, this pattern was reversed under drought. We suggest that these different response patterns reflect strategies of the managed and the abandoned grassland to enhance their respective resilience to drought, by fostering their resistance and recovery respectively. We conclude that while severe drought can override the effects of abandonment of grassland management on the respiratory dynamics of recent C, abandonment alters strategies of belowground assimilate investment, with consequences for soil-CO2 fluxes during drought and drought-recovery. © 2020 The Authors. Global Change Biology published by John Wiley & Sons Ltd.

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