中国科学院机构知识库网格
Chinese Academy of Sciences Institutional Repositories Grid
Divergence in ecosystem carbon fluxes and soil nitrogen characteristics across alpine steppe, alpine meadow and alpine swamp ecosystems in a biome transition zone

文献类型:期刊论文

作者Liu, Yongwen1,2; Geng, Xiaodong3; Tenzintarchen4; Wei, Da5; Dai, Dongxue6; Xu-Ri1,2
刊名SCIENCE OF THE TOTAL ENVIRONMENT
出版日期2020-12-15
卷号748页码:11
ISSN号0048-9697
关键词Climate change Carbon and nitrogen cycling Net ecosystem carbon dioxide exchange Gross ecosystem photosynthesis Denitrification rate Tibetan Plateau
DOI10.1016/j.scitotenv.2020.142453
通讯作者Liu, Yongwen(liuyongwen@itpcas.ac.cn) ; Xu-Ri(xu-ri@itpcas.ac.cn)
产权排序5
英文摘要Alpine ecosystem carbon cycling is sensitive to climate change, particularly in the transition zones between biomes. Soil nitrogen conditions, including the ammonium to nitrate (NH4+/NO3-) ratio, regulate ecosystem carbon uptake by coupling carbon-nitrogen cycle. The largest alpine pasture on Earth is distributed on the Tibetan Plateau, where alpine biome transition zones are also widely distributed. However, it is largely unknown how the soil NH4+/NO3- ratio and net ecosystem CO2 exchange vary among vegetation types in the alpine biome transition zones due to a lack of in situ field observations. Here, we investigated soil NH4+/NO3- ratio and ecosystem carbon fluxes across alpine steppe, alpine meadow and alpine swamp ecosystems in a biome transition zone on the central Tibetan Plateau. The results showed that soil NH4+/NO3- ratio was lowest in the alpine steppe (driest environment), which had the highest soil pH, and highest in the alpine swamp (wettest environment), which had the lowest soil pH. We proposed a theoretical framework describing how soil moisture regulates soil NH4+/NO3- ratio by altering both the denitrification process and soil pH. We further found that the growing season average net ecosystem CO2 exchange for the alpine steppe, alpine meadow and alpine swamp was -1.46, - 1.90 and -5.43 mu mol m(-2) s(-1), respectively. This divergence in net ecosystem CO2 exchange across the three grasslands is primarily explained by divergence in gross ecosystem photosynthesis, rather than ecosystem respiration. The air temperature sensitivity of ecosystem respiration (Q(10)) for the alpine steppe, alpine meadow and alpine swamp was 1.73 +/- 0.05, 1.44 +/- 0.03 and 2.43 +/- 0.45, respectively. Our study highlights large differences in both soil nutrient and ecosystem carbon uptake across different vegetation types in an alpine biome transition zone. More in situ investigations in various biome transition zones are urgently needed to quantitatively understand the spatial pattern of alpine ecosystem carbon-nitrogen cycling processes. (C) 2020 Elsevier B.V. All rights reserved.y
WOS关键词BIOLOGICAL NITRIFICATION INHIBITION ; TIBETAN PLATEAU ; CLIMATE-CHANGE ; OXIDE EMISSIONS ; VEGETATION CHARACTERISTICS ; TEMPERATURE SENSITIVITY ; INORGANIC NITROGEN ; CO2 EXCHANGE ; ICE CORE ; MOISTURE
资助项目Strategic Priority Research Program of Chinese Academy of Sciences[XDA20050102] ; National Natural Science Foundation of China[41701089] ; National Natural Science Foundation of China[41861134036] ; National Natural Science Foundation of China[41775161] ; Youth Innovation Promotion Association CAS[2019074]
WOS研究方向Environmental Sciences & Ecology
语种英语
出版者ELSEVIER
WOS记录号WOS:000581049800131
资助机构Strategic Priority Research Program of Chinese Academy of Sciences ; National Natural Science Foundation of China ; Youth Innovation Promotion Association CAS
源URL[http://ir.imde.ac.cn/handle/131551/50664]  
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
通讯作者Liu, Yongwen; Xu-Ri
作者单位1.Chinese Acad Sci, CAS Ctr Excellence Tibetan Plateau Earth Sci, Beijing 100101, Peoples R China
2.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Alpine Ecol, 16 Lincui Rd, Beijing 100101, Peoples R China
3.Anqing Normal Univ, Sch Resources & Environm, Anqing 246133, Peoples R China
4.Tibet Acad Agr & Anim Husb Sci, Inst Pratacultural Sci, Lhasa 850000, Peoples R China
5.Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China
6.Hebei Normal Univ Nationalities, Coll Biol & Food Sci, Chengde 067000, Peoples R China
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Liu, Yongwen,Geng, Xiaodong,Tenzintarchen,et al. Divergence in ecosystem carbon fluxes and soil nitrogen characteristics across alpine steppe, alpine meadow and alpine swamp ecosystems in a biome transition zone[J]. SCIENCE OF THE TOTAL ENVIRONMENT,2020,748:11.
APA Liu, Yongwen,Geng, Xiaodong,Tenzintarchen,Wei, Da,Dai, Dongxue,&Xu-Ri.(2020).Divergence in ecosystem carbon fluxes and soil nitrogen characteristics across alpine steppe, alpine meadow and alpine swamp ecosystems in a biome transition zone.SCIENCE OF THE TOTAL ENVIRONMENT,748,11.
MLA Liu, Yongwen,et al."Divergence in ecosystem carbon fluxes and soil nitrogen characteristics across alpine steppe, alpine meadow and alpine swamp ecosystems in a biome transition zone".SCIENCE OF THE TOTAL ENVIRONMENT 748(2020):11.

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来源:成都山地灾害与环境研究所

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