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Climate Change Can Accelerate Depletion of Montane Grassland C Stocks

Wang, Na
Xia, Longlong
Goodale, Christine L.ORCIDiD
Butterbach‐Bahl, KlausORCIDiD
Kiese, RalfORCIDiD
DOI: https://doi.org/10.1029/2020GB006792
Persistent URL: http://resolver.sub.uni-goettingen.de/purl?gldocs-11858/9854
Supplement: https://figshare.com/articles/dataset/Data%5Fof%5Fpublication%5FWang%5Fet%5Fal%5Funder%5Freview%5FGBC/14566215
Wang, Na; Xia, Longlong; Goodale, Christine L.; Butterbach‐Bahl, Klaus; Kiese, Ralf, 2021: Climate Change Can Accelerate Depletion of Montane Grassland C Stocks. In: Global Biogeochemical Cycles, Band 35, 10, DOI: 10.1029/2020GB006792.
 
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  • Abstract
Climate warming and management will likely affect carbon (C) fluxes of montane grassland ecosystems. In this study, we assessed the effect of simultaneous warming (+2°C) and decreased precipitation (−25%) on carbon exchange of montane grasslands in S‐Germany by translocating large intact plant‐soil cores from a high altitude to a low altitude site. Cores received two common grassland management regimes: intensive (4–5 cuts and slurry application) and extensive (1–2 cuts and slurry application). Diurnal patterns of net ecosystem exchange (NEE) and total ecosystem respiration (Reco) were measured over 1.5 years in 2–3 weeks intervals during the snow free period. Additional data on environmental controls, that is, photosynthetic active radiation, grass height and soil moisture and temperature, were used to develop empirical models to estimate daily and annual fluxes of gross primary production (GPP) and Reco. Considering the 2 years period (2014 and 2015), we found that, under warmer and slightly drier conditions, both GPP and Reco significantly (p < 0.01) increased (up to 20%) but with a higher temperature sensitivity of Reco, particularly in intensive managed grassland. The higher temperature sensitivity of Reco reduced the NEE by 0.7 t C ha−1 yr−1 for both extensive and intensive management, respectively. Considering additional carbon inputs via slurry and exports via harvest (i.e., annual net ecosystem carbon budget), our results showed that managed grasslands are already a source of C under current climate conditions (1.7–1.8 t ha−1 yr−1) which significantly (p < 0.05) increased under climate warming (2.3–2.9 t ha−1 yr−1).
 
Key Points: Climate change can accelerate depletion of montane grassland C stocks. Under warmer conditions gross primary production and ecosystem respiration (Reco) increase, but Reco with a higher temperature sensitivity. Adaptation of grassland cutting and manure management regimes can likely reduce ecosystem carbon losses.
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  • Montanwesen, Energie, Ressourcen, Umwelt [171]
Subjects:
climate warming
grassland
management intensity
carbon fluxes
carbon balance
This is an open access article under the terms of the Creative Commons Attribution‐NonCommercial‐NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non‐commercial and no modifications or adaptations are made.

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