Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost

Annual ecosystem respiration is resistant to changes in freeze-thaw periods in semi-arid permafrost

© 2019 John Wiley & Sons Ltd.

Bibliographische Detailangaben
Veröffentlicht in:Global change biology. - 1999. - 26(2020), 4 vom: 02. Apr., Seite 2630-2641
1. Verfasser: Wang, Qi (VerfasserIn)
Weitere Verfasser: Lv, Wangwang, Li, Bowen, Zhou, Yang, Jiang, Lili, Piao, Shilong, Wang, Yanfen, Zhang, Lirong, Meng, Fandong, Liu, Peipei, Hong, Huan, Li, Yaoming, Dorji, Tsechoe, Luo, Caiyun, Zhang, Zhenhua, Ciais, Philippe, Peñuelas, Josep, Kardol, Paul, Zhou, Huakun, Wang, Shiping
Format: Online-Aufsatz
Sprache:English
Veröffentlicht: 2020
Zugriff auf das übergeordnete Werk:Global change biology
Schlagworte:Journal Article Tibetan Plateau ecosystem respiration freeze-thaw events number and frequency of freeze-thaw cycles precipitation addition semi-arid with ice-poor permafrost warming gradient
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520 |a Warming in cold regions alters freezing and thawing (F-T) of soil in winter, exposing soil organic carbon to decomposition. Carbon-rich permafrost is expected to release more CO2 to the atmosphere through ecosystem respiration (Re) under future climate scenarios. However, the mechanisms of the responses of freeze-thaw periods to climate change and their coupling with Re in situ are poorly understood. Here, using 2 years of continuous data, we test how changes in F-T events relate to annual Re under four warming levels and precipitation addition in a semi-arid grassland with discontinuous alpine permafrost. Warming shortened the entire F-T period because the frozen period shortened more than the extended freezing period. It decreased total Re during the F-T period mainly due to decrease in mean Re rate. However, warming did not alter annual Re because of reduced soil water content and the small contribution of total Re during the F-T period to annual Re. Although there were no effects of precipitation addition alone or interactions with warming on F-T events, precipitation addition increased total Re during the F-T period and the whole year. This decoupling between changes in soil freeze-thaw events and annual Re could result from their different driving factors. Our results suggest that annual Re could be mainly determined by soil water content rather than by change in freeze-thaw periods induced by warming in semi-arid alpine permafrost 
650 4 |a Journal Article 
650 4 |a Tibetan Plateau 
650 4 |a ecosystem respiration 
650 4 |a freeze-thaw events 
650 4 |a number and frequency of freeze-thaw cycles 
650 4 |a precipitation addition 
650 4 |a semi-arid with ice-poor permafrost 
650 4 |a warming gradient 
700 1 |a Lv, Wangwang  |e verfasserin  |4 aut 
700 1 |a Li, Bowen  |e verfasserin  |4 aut 
700 1 |a Zhou, Yang  |e verfasserin  |4 aut 
700 1 |a Jiang, Lili  |e verfasserin  |4 aut 
700 1 |a Piao, Shilong  |e verfasserin  |4 aut 
700 1 |a Wang, Yanfen  |e verfasserin  |4 aut 
700 1 |a Zhang, Lirong  |e verfasserin  |4 aut 
700 1 |a Meng, Fandong  |e verfasserin  |4 aut 
700 1 |a Liu, Peipei  |e verfasserin  |4 aut 
700 1 |a Hong, Huan  |e verfasserin  |4 aut 
700 1 |a Li, Yaoming  |e verfasserin  |4 aut 
700 1 |a Dorji, Tsechoe  |e verfasserin  |4 aut 
700 1 |a Luo, Caiyun  |e verfasserin  |4 aut 
700 1 |a Zhang, Zhenhua  |e verfasserin  |4 aut 
700 1 |a Ciais, Philippe  |e verfasserin  |4 aut 
700 1 |a Peñuelas, Josep  |e verfasserin  |4 aut 
700 1 |a Kardol, Paul  |e verfasserin  |4 aut 
700 1 |a Zhou, Huakun  |e verfasserin  |4 aut 
700 1 |a Wang, Shiping  |e verfasserin  |4 aut 
773 0 8 |i Enthalten in  |t Global change biology  |d 1999  |g 26(2020), 4 vom: 02. Apr., Seite 2630-2641  |w (DE-627)NLM098239996  |x 1365-2486  |7 nnas 
773 1 8 |g volume:26  |g year:2020  |g number:4  |g day:02  |g month:04  |g pages:2630-2641 
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