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- W2904503732 endingPage "60" @default.
- W2904503732 startingPage "46" @default.
- W2904503732 abstract "Abstract High latitude warming and permafrost thaw will expose vast stores of deep soil organic carbon (SOC) to decomposition. Thaw also changes water movement causing either wetter or drier soil. The fate of deep SOC under different thaw and moisture conditions is unclear. We measured weekly growing‐season δ 13 C of ecosystem respiration (Recoδ 13 C) across thaw and moisture conditions (Shallow‐Dry; Deep‐Dry; Deep‐Wet) in a soil warming manipulation. Deep SOC loss was inferred from known δ 13 C signatures of plant shoot, root, surface soil, and deep soil respiration. In addition, a 2‐year‐old vegetation removal treatment (No Veg) was used to isolate surface and deep SOC decomposition contributions to Reco. In No Veg, seasonal Recoδ 13 C indicated that deep SOC loss increased as the soil column thawed, while in vegetated areas, root contributions appeared to dominate Reco. The Recoδ 13 C differences between Shallow‐Dry and Deep‐Dry were significant but surprisingly small. This most likely suggests that, under dry conditions, soil warming stimulates root and surface SOC respiration with a negative 13 C signature that opposes the more positive 13 C signal from increased deep SOC respiration. In Deep‐Wet conditions, Recoδ 13 C suggests reduced deep SOC loss but could also reflect altered diffusion or methane (CH 4 ) dynamics. Together, these results demonstrate that frequent Recoδ 13 C measurements can detect deep SOC loss and that plants confound the signal. In future studies, soil profile δ 13 C measurements, vegetation removal across thaw gradients, and isotopic effects of CH 4 dynamics could further deconvolute deep SOC loss via surface Reco." @default.
- W2904503732 created "2018-12-22" @default.
- W2904503732 creator A5002004975 @default.
- W2904503732 creator A5004503331 @default.
- W2904503732 creator A5013874367 @default.
- W2904503732 creator A5025459603 @default.
- W2904503732 creator A5037632590 @default.
- W2904503732 creator A5041882417 @default.
- W2904503732 creator A5045255866 @default.
- W2904503732 creator A5065376817 @default.
- W2904503732 creator A5070126514 @default.
- W2904503732 creator A5078013390 @default.
- W2904503732 creator A5078568413 @default.
- W2904503732 date "2019-01-01" @default.
- W2904503732 modified "2023-10-18" @default.
- W2904503732 title "Using Stable Carbon Isotopes of Seasonal Ecosystem Respiration to Determine Permafrost Carbon Loss" @default.
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