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

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ID: 73439
2019
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Abstract
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 CO 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.
Reference Key
wang2019annualglobal Use this key to autocite in the manuscript while using SciMatic Manuscript Manager or Thesis Manager
Authors Wang, Qi;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;
Journal Global change biology
Year 2019
DOI
10.1111/gcb.14979
URL
Keywords
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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