中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
首页 机构 成果 学者
  
  1. CAS IR Grid
  2. 地理科学与资源研究所
  3. 中国科学院地理科学与资源研究所
Radiation, soil water content, and temperature effects on carbon cycling in an alpine swamp meadow of the northeastern Qinghai-Tibetan Plateau

文献类型：期刊论文

作者Wei, Junqi2,3; Li, Xiaoyan2,3,4,5,6,7; Liu, Lei1,8; Christensen, Torben Rojle9,10; Jiang, Zhiyun11; Ma, Yujun12; Wu, Xiuchen2,3; Yao, Hongyun2,3; Lopez-Blanco, Efren9,13
刊名BIOGEOSCIENCES
出版日期2022-02-10
卷号19期号:3页码:861-875
ISSN号1726-4170
DOI10.5194/bg-19-861-2022
通讯作者Li, Xiaoyan(xyli@bnu.edu.cn)
英文摘要Predicted intensified climate warming will likely alter the ecosystem net carbon (C) uptake of the Qinghai-Tibetan Plateau (QTP). Variations in C sink-source responses to climate warming have been linked to water availability; however, the mechanisms by which net C uptake responds to soil water content in saturated swamp meadow ecosystems remain unclear. To explore how soil moisture and other environmental drivers modulate net C uptake in the QTP, field measurements were conducted using the eddy covariance technique in 2014, 2015, 2017, and 2018. The alpine swamp meadow presented in this study was a persistent and strong C sink of CO2 (-168.0 +/- 62.5 g C m(-2) yr(-1), average +/- standard deviation) across the entire 4-year study period. A random forest machine-learning analysis suggested that the diurnal and seasonal variations of net ecosystem exchange (NEE) and gross primary productivity (GPP) were regulated by temperature and net radiation. Ecosystem respiration (Re), however, was found mainly regulated by the variability of soil water content (SWC) at different temporal aggregations, followed by temperature, the second contributing driver. We further explored how Re is controlled by nearly saturated soil moisture and temperature comparing two different periods featuring almost identical temperatures and significant differences on SWC and vice versa. Our data suggest that, despite the relatively abundant water supply, periods with a substantial decrease in SWC or increase in temperature produced higher Re and therefore weakened the C sink strength. Our results reveal that nearly saturated soil conditions during the growing seasons can help maintain lower ecosystem respiration rates and thus enhance the overall C sequestration capacity in this alpine swamp meadow. We argue that soil respiration and subsequent ecosystem C sink magnitude in alpine swamp meadows could likely be affected by future changes in soil hydrological conditions caused by permafrost degradation or accelerated thawing-freezing cycling due to climate warming.
WOS关键词ECOSYSTEM CO2 EXCHANGE ; DIOXIDE EXCHANGE ; EDDY-COVARIANCE ; TERRESTRIAL ECOSYSTEMS ; NITROGEN ADDITION ; SANJIANG PLAIN ; WETLAND ; FLUXES ; CLIMATE ; RESPIRATION
资助项目National Natural Science Foundation of China[NSFC 41730854] ; National Natural Science Foundation of China[41971029] ; Second Tibetan Plateau Scientific Expedition and Research Program[STEP 2019QZKK0306] ; Strategic Priority Research Program of Chinese Academy of Sciences[XDA20100102] ; State Key Laboratory of Earth Surface Processes and Resource Ecology ; China Scholarship Council[201906040130] ; Faculty of Technical Sciences from Aarhus University ; Greenland Research Council - Danish Program for Arctic Research[80.35]
WOS研究方向Environmental Sciences & Ecology ; Geology
语种英语
WOS记录号WOS:000758151400001
出版者COPERNICUS GESELLSCHAFT MBH
资助机构National Natural Science Foundation of China ; Second Tibetan Plateau Scientific Expedition and Research Program ; Strategic Priority Research Program of Chinese Academy of Sciences ; State Key Laboratory of Earth Surface Processes and Resource Ecology ; China Scholarship Council ; Faculty of Technical Sciences from Aarhus University ; Greenland Research Council - Danish Program for Arctic Research
源URL[http://ir.igsnrr.ac.cn/handle/311030/171202]  
专题中国科学院地理科学与资源研究所
通讯作者Li, Xiaoyan
作者单位1.Chinese Acad Sci, Inst Geog Sci & Nat Resources Res, Beijing 100101, Peoples R China
2.Beijing Normal Univ, Fac Geog Sci, State Key Lab Earth Surface Proc & Resource Ecol, Beijing 100875, Peoples R China
3.Beijing Normal Univ, Fac Geog Sci, Sch Nat Resources, Beijing 100875, Peoples R China
4.Peoples Govt Qinghai Prov, Acad Plateau Sci & Sustainabil, Xining 810008, Peoples R China
5.Beijing Normal Univ, Xining 810008, Peoples R China
6.Qinghai Normal Univ, Xining 810008, Peoples R China
7.Qinghai Normal Univ, Key Lab Tibetan Plateau Land Surface Proc & Ecol, Minist Educ, Xining 810016, Peoples R China
8.Univ Chinese Acad Sci, Coll Resources & Environm, Beijing 100049, Peoples R China
9.Aarhus Univ, Arctic Res Ctr, Dept Ecosci, DK-4000 Roskilde, Denmark
10.Univ Oulu, Oulanka Res Stn, Oulu, Finland
推荐引用方式
GB/T 7714		 Wei, Junqi,Li, Xiaoyan,Liu, Lei,et al. Radiation, soil water content, and temperature effects on carbon cycling in an alpine swamp meadow of the northeastern Qinghai-Tibetan Plateau[J]. BIOGEOSCIENCES,2022,19(3):861-875.
APA Wei, Junqi.,Li, Xiaoyan.,Liu, Lei.,Christensen, Torben Rojle.,Jiang, Zhiyun.,...&Lopez-Blanco, Efren.(2022).Radiation, soil water content, and temperature effects on carbon cycling in an alpine swamp meadow of the northeastern Qinghai-Tibetan Plateau.BIOGEOSCIENCES,19(3),861-875.
MLA Wei, Junqi,et al."Radiation, soil water content, and temperature effects on carbon cycling in an alpine swamp meadow of the northeastern Qinghai-Tibetan Plateau".BIOGEOSCIENCES 19.3(2022):861-875.

入库方式： OAI收割

来源：地理科学与资源研究所

浏览0
下载0
收藏0
其他版本

除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。