DOI: 10.1111/gcb.14578
Scopus记录号: 2-s2.0-85061996259
论文题名: Drainage enhances modern soil carbon contribution but reduces old soil carbon contribution to ecosystem respiration in tundra ecosystems
作者: Kwon M.J. ; Natali S.M. ; Hicks Pries C.E. ; Schuur E.A.G. ; Steinhof A. ; Crummer K.G. ; Zimov N. ; Zimov S.A. ; Heimann M. ; Kolle O. ; Göckede M.
刊名: Global Change Biology
ISSN: 13541013
出版年: 2019
卷: 25, 期: 4 起始页码: 1315
结束页码: 1325
语种: 英语
英文关键词: carbon source partitioning
; drying experiment
; ecosystem respiration
; permafrost
; radiocarbon
; soil hydrology
英文摘要: 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. © 2019 John Wiley & Sons Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/117451
Appears in Collections: 气候变化与战略
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Recommended Citation:
Kwon M.J.,Natali S.M.,Hicks Pries C.E.,et al. Drainage enhances modern soil carbon contribution but reduces old soil carbon contribution to ecosystem respiration in tundra ecosystems[J]. Global Change Biology,2019-01-01,25(4)