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Permafrost Degradation Diminishes Terrestrial Ecosystem Carbon Sequestration Capacity on the Qinghai-Tibetan Plateau

文献类型：期刊论文

作者Liu, Lei2,3,4; Zhuang, Qianlai4; Zhao, Dongsheng2; Zheng, Du2,3; Kou, Dan4,5; Yang, Yuanhe1,3
刊名GLOBAL BIOGEOCHEMICAL CYCLES
出版日期2022-02-01
卷号36期号:2页码:20
关键词Permafrost degradation C-N feedbacks deep soil Tibetan Plateau
ISSN号0886-6236
DOI10.1029/2021GB007068
通讯作者Zhao, Dongsheng(zhaods@igsnrr.ac.cn)
英文摘要Effects of permafrost degradation on carbon (C) and nitrogen (N) cycling on the Qinghai-Tibetan Plateau (QTP) have rarely been analyzed. This study used a revised process-based biogeochemical model to quantify the effects in the region during the 21st century. We found that permafrost degradation would expose 0.61 +/- 0.26 (mean +/- SD) and 1.50 +/- 0.15 Pg C of soil organic carbon under the representative concentration pathway (RCP) 4.5 and the RCP 8.5, respectively. Among them, more than 20% will be decomposed, enhancing heterotrophic respiration by 8.62 +/- 4.51 (RCP 4.5) and 33.66 +/- 14.03 (RCP 8.5) Tg C/yr in 2099. Deep soil N supply due to thawed permafrost is not accessible to plants, only stimulating net primary production by 7.15 +/- 4.83 (RCP 4.5) and 24.27 +/- 9.19 (RCP 8.5) Tg C/yr in 2099. As a result, the single effect of permafrost degradation would cumulatively weaken the regional C sink by 209.44 +/- 137.49 (RCP 4.5) and 371.06 +/- 151.70 (RCP 8.5) Tg C during 2020-2099. However, when factors of climate change, CO2 increasing and permafrost degradation are all considered, the permafrost region on the QTP would be a stronger C sink in the 21st century. Permafrost degradation has a greater influence on C balance of alpine meadows than alpine steppes on the QTP. The shallower active layer, higher soil C and N stocks, and wetter environment in alpine meadows are responsible for its stronger response to permafrost degradation. This study highlights that permafrost degradation could continue to release large amounts of C to the atmosphere irrespective of potentially more nitrogen available from deep soils.
WOS关键词NET PRIMARY PRODUCTIVITY ; SOIL ORGANIC-CARBON ; CLIMATE-CHANGE ; ALPINE MEADOW ; ATMOSPHERIC CO2 ; NITROGEN AVAILABILITY ; DYNAMICS ; SENSITIVITY ; MODEL ; VARIABILITY
资助项目Second Tibetan Plateau Scientific Expedition and Research Program[2019QZKK0403] ; National Natural Science Foundation of China[41571193] ; Strategic Priority Research Program of the Chinese Academy of Sciences[XDA20020202] ; China Scholarship Council
WOS研究方向Environmental Sciences & Ecology ; Geology ; Meteorology & Atmospheric Sciences
语种英语
WOS记录号WOS:000765649200007
出版者AMER GEOPHYSICAL UNION
资助机构Second Tibetan Plateau Scientific Expedition and Research Program ; National Natural Science Foundation of China ; Strategic Priority Research Program of the Chinese Academy of Sciences ; China Scholarship Council
源URL[http://ir.igsnrr.ac.cn/handle/311030/172265]  
专题中国科学院地理科学与资源研究所
通讯作者Zhao, Dongsheng
作者单位1.Chinese Acad Sci, Inst Bot, State Key Lab Vegetat & Environm Change, Beijing, Peoples R China
2.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Key Lab Land Surface Pattern & Simulat, Beijing, Peoples R China
3.Univ Chinese Acad Sci, Beijing, Peoples R China
4.Purdue Univ, Dept Earth Atmospher & Planetary Sci, W Lafayette, IN 47907 USA
5.Univ Eastern Finland, Dept Environm & Biol Sci, Biogeochem Res Grp, Kuopio, Finland
推荐引用方式
GB/T 7714		 Liu, Lei,Zhuang, Qianlai,Zhao, Dongsheng,et al. Permafrost Degradation Diminishes Terrestrial Ecosystem Carbon Sequestration Capacity on the Qinghai-Tibetan Plateau[J]. GLOBAL BIOGEOCHEMICAL CYCLES,2022,36(2):20.
APA Liu, Lei,Zhuang, Qianlai,Zhao, Dongsheng,Zheng, Du,Kou, Dan,&Yang, Yuanhe.(2022).Permafrost Degradation Diminishes Terrestrial Ecosystem Carbon Sequestration Capacity on the Qinghai-Tibetan Plateau.GLOBAL BIOGEOCHEMICAL CYCLES,36(2),20.
MLA Liu, Lei,et al."Permafrost Degradation Diminishes Terrestrial Ecosystem Carbon Sequestration Capacity on the Qinghai-Tibetan Plateau".GLOBAL BIOGEOCHEMICAL CYCLES 36.2(2022):20.

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