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  4. 山地表生过程与生态调控重点实验室
Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale

文献类型：期刊论文

作者Song Chunlin2,3; Wang Genxu2; Hu Zhaoyong2,3; Zhang Tao1; Huang Kewei2,5; Chen Xiaopeng4; Li Yang2,5
刊名AGRICULTURAL AND FOREST METEOROLOGY
出版日期2020
卷号290页码:UNSP 108021
ISSN号0168-1923
关键词Net ecosystem carbon budget Grassland Eddy covariance Riverine carbon Catchment Qinghai-Tibet Plateau
DOI10.1016/j.agrformet.2020.108021
通讯作者Wang, Genxu(wanggx@imde.ac.cn)
产权排序2
文献子类Article
英文摘要The effects of aquatic carbon exports on grassland ecosystem carbon balance is unclear. Here we quantified the seasonal and annual net ecosystem carbon budget (NECB) of an alpine grassland ecosystem in the Qinghai-Tibet Plateau (QTP) permafrost region with integrative terrestrial and aquatic carbon flux measurements. The terrestrial carbon fluxes, including the net ecosystem production (NEP) and CH4 flux, were derived from eddy covariance and previous chamber-based measurements. The aquatic carbon fluxes, including dissolved organic carbon, biogenic dissolved inorganic carbon, particulate carbon, and riverine CO2 efflux of the catchment, were determined with stream monitoring. We found that NECB exhibited distinct seasonal features for the grassland ecosystem, which shifted from a carbon sink in growing season (68.8 +/- 8.7 g C m(-2)) to a carbon source in nongrowing season (- 41.1 +/- 2.4 g C m(-2)), while the NECB (27.7 +/- 6 g C m(-2) yr(-1)) demonstrated a net carbon sink at an annual basis. The total aquatic carbon flux (TAC, 11.8 +/- 1.5 g C m(-2) yr(-1)) offset 14% of the land carbon assimilation for growing season and 30% of the annual land carbon assimilation after subtracting ecosystem respiration. The higher TAC/NEP ratios in low NEP months indicated that aquatic carbon was more important on offsetting terrestrial carbon sink when NEP was low. Our results show a large contribution of aquatic carbon to NECB in a QTP grassland ecosystem, which suggest that disregarding the aquatic carbon flux can substantially overestimate the strength of terrestrial carbon sink. As aquatic carbon is coupled with hydrological processes, TAC is crucially important for NECB in the cryosphere ecosystem since the drastic hydrology and permafrost change can transport more soil carbon into the fluvial networks. More studies on NECB is needed, especially when the ecosystem have a low NEP and actively changing hydrological processes.
电子版国际标准刊号1873-2240
WOS关键词DISSOLVED ORGANIC-CARBON ; PERMAFROST REGION ; NITROGEN-FERTILIZATION ; ALPINE GRASSLANDS ; EDDY-COVARIANCE ; CO2 EMISSIONS ; GHG FLUX ; CLIMATE ; BALANCE ; SOIL
资助项目Second Tibetan Plateau Scientific Expedition and Research Program (STEP)[2019QZKK0304] ; National Natural Science Foundation of China[41890821] ; China Postdoctoral Science Foundation[2019M663566]
WOS研究方向Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
语种英语
出版者ELSEVIER
WOS记录号WOS:000540172000015
资助机构Second Tibetan Plateau Scientific Expedition and Research Program (STEP) ; National Natural Science Foundation of China ; China Postdoctoral Science Foundation
源URL[http://ir.imde.ac.cn/handle/131551/34901]  
专题成都山地灾害与环境研究所_山地表生过程与生态调控重点实验室
成都山地灾害与环境研究所_数字山地与遥感应用中心
通讯作者Wang Genxu
作者单位1.Institute of New Rural Development, Guizhou University, Guiyang, China;
2.Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu, China;
3.State Key Laboratory of Hydraulics and Mountain River Engineering, College of Water Resource and Hydropower, Sichuan University, Chengdu, China;
4.College of Animal Science and Veterinary Medicine, Shanxi Agricultural University, Jinzhong, China
5.University of Chinese Academy of Sciences, Beijing, China;
推荐引用方式
GB/T 7714		 Song Chunlin,Wang Genxu,Hu Zhaoyong,et al. Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale[J]. AGRICULTURAL AND FOREST METEOROLOGY,2020,290:UNSP 108021.
APA Song Chunlin.,Wang Genxu.,Hu Zhaoyong.,Zhang Tao.,Huang Kewei.,...&Li Yang.(2020).Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale.AGRICULTURAL AND FOREST METEOROLOGY,290,UNSP 108021.
MLA Song Chunlin,et al."Net ecosystem carbon budget of a grassland ecosystem in central Qinghai-Tibet Plateau: integrating terrestrial and aquatic carbon fluxes at catchment scale".AGRICULTURAL AND FOREST METEOROLOGY 290(2020):UNSP 108021.

入库方式： OAI收割

来源：成都山地灾害与环境研究所

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