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Title: Drainage enhances modern soil carbon contribution but reduces old soil carbon contribution to ecosystem respiration in tundra ecosystems

Journal Article · · Global Change Biology
DOI:https://doi.org/10.1111/gcb.14578· OSTI ID:1496656
ORCiD logo [1];  [2];  [3];  [4];  [5];  [6];  [7];  [7];  [8];  [5];  [5]
  1. Max Planck Institute for Biogeochemistry Jena Germany, Korea Polar Research Institute Incheon South Korea
  2. Woods Hole Research Center Falmouth Massachusetts
  3. Earth Sciences Division Lawrence Berkeley National Laboratory Berkeley California, Department of Biological Sciences Dartmouth College Hanover New Hampshire
  4. Center for Ecosystem Science and Society, and Department of Biological Sciences Northern Arizona University Flagstaff Arizona
  5. Max Planck Institute for Biogeochemistry Jena Germany
  6. Department of Biology University of Florida Gainesville Florida
  7. North‐East Science Station, Pacific Institute for Geography Far‐Eastern Branch of Russian Academy of Science Chersky Republic of Sakha (Yakutia) Russia
  8. Max Planck Institute for Biogeochemistry Jena Germany, Division of Atmospheric Sciences, Department of Physics Helsinki University Helsinki Finland

Abstract Warming temperatures are likely to accelerate permafrost thaw in the Arctic, potentially leading to the release of old carbon previously stored in deep frozen soil layers. Deeper thaw depths in combination with geomorphological changes due to the loss of ice structures in permafrost, may modify soil water distribution, creating wetter or drier soil conditions. Previous studies revealed higher ecosystem respiration rates under drier conditions, and this study investigated the cause of the increased ecosystem respiration rates using radiocarbon signatures of respired CO 2 from two drying manipulation experiments: one in moist and the other in wet tundra. We demonstrate that higher contributions of CO 2 from shallow soil layers (0–15 cm; modern soil carbon) drive the increased ecosystem respiration rates, while contributions from deeper soil (below 15 cm from surface and down to the permafrost table; old soil carbon) decreased. These changes can be attributed to more aerobic conditions in shallow soil layers, but also the soil temperature increases in shallow layers but decreases in deep layers, due to the altered thermal properties of organic soils. Decreased abundance of aerenchymatous plant species following drainage in wet tundra reduced old carbon release but increased aboveground plant biomass elevated contributions of autotrophic respiration to ecosystem respiration. The results of this study suggest that drier soils following drainage may accelerate decomposition of modern soil carbon in shallow layers but slow down decomposition of old soil carbon in deep layers, which may offset some of the old soil carbon loss from thawing permafrost.

Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0006982
OSTI ID:
1496656
Journal Information:
Global Change Biology, Journal Name: Global Change Biology Vol. 25 Journal Issue: 4; ISSN 1354-1013
Publisher:
Wiley-BlackwellCopyright Statement
Country of Publication:
United Kingdom
Language:
English
Citation Metrics:
Cited by: 23 works
Citation information provided by
Web of Science

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