气候变化领域集成服务门户(CCPortal): Watershed scale patterns and controlling factors of ecosystem respiration and methane fluxes in a Tibetan alpine grassland

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DOI	10.1016/j.agrformet.2021.108451
	Watershed scale patterns and controlling factors of ecosystem respiration and methane fluxes in a Tibetan alpine grassland
	Li, Yang; Wang, Genxu; Bing, Haijian; Wang, Tao; Huang, Kewei; Song, Chunlin; Chen, Xiaopeng; Hu, Zhaoyong; Rui, Pengfei; Song, Xiaoyan; Chang, Ruiying
通讯作者	Chang, RY (通讯作者)，Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China.
发表日期	2021
ISSN	0168-1923
EISSN	1873-2240
卷号	306
英文摘要	Ecosystem respiration (Re) and methane (CH4) fluxes are two important soil-atmosphere carbon exchange processes that have been well documented at the local scale. However, the spatial patterns and controlling factors of these processes remain unclear in the Tibetan alpine permafrost region at the watershed scale. We conducted a two-year field monitoring study of Re and CH4 fluxes at three altitudinal positions on shady and sunny slopes in a Tibetan alpine grassland to determine the spatial variability in the two processes and to identify their underlying mechanisms. The microbial factor had a controlling effect on Re spatial variability in alpine grassland watersheds. The lower soil temperature and soil organic matter content at the upper slope positions on the shady slopes inhibited Re because they reduced the soil microbial activity. We found that the alpine grassland to be a net sink of atmospheric CH4, and the average CH4 flux rates exhibited large spatial variance ranging from 1.60 to 10.48 mu g CH4 m(-2) h(-1) within the watersheds. The spatial variability in soil volumetric water content explained 76% of the variation in CH4 fluxes within the watersheds. We suggest that the influence of permafrost on hydrologic conditions may increase the spatial variability of soil moisture (measured as soil volumetric water content and water-filled pore space) in alpine grassland watersheds, and generally form poorly drained landscape at the lower slope position where Re and CH4 uptake are inhibited. Our results highlight the indirect effects of terrain and permafrost on Re and CH4 fluxes through their effects on biophysiochemical factors. We recommend that the spatial variability in Re and CH4 fluxes at the watershed scale of Tibetan alpine grassland should be given more attention in earth system models, especially the variability of CH4 fluxes with altitudinal position.
关键词	IN-SITU MEASUREMENTS PERMAFROST REGION SOIL RESPIRATION NITROUS-OXIDE SLOPE ASPECT N2O FLUXES CARBON CH4 CO2 TUNDRA
英文关键词	Methane sink; Permafrost; Terrain; Tibetan Plateau; Watershed scale
语种	英语
WOS研究方向	Agriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS类目	Agronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS记录号	WOS:000659137200017
来源期刊	AGRICULTURAL AND FOREST METEOROLOGY
来源机构	中国科学院西北生态环境资源研究院
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/254753
作者单位	[Li, Yang; Wang, Genxu; Song, Chunlin; Hu, Zhaoyong] Sichuan Univ, Coll Water Resource & Hydropower, State Key Lab Hydraul & Mt River Engn, Chengdu, Sichuan, Peoples R China; [Wang, Genxu; Bing, Haijian; Wang, Tao; Huang, Kewei; Chang, Ruiying] Chinese Acad Sci, Inst Mt Hazards & Environm, Key Lab Mt Surface Proc & Ecol Regulat, Chengdu 610041, Peoples R China; [Chen, Xiaopeng] Shanxi Agr Univ, Coll Grassland Sci, Taigu 030801, Peoples R China; [Rui, Pengfei] Chinese Acad Sci, Northwest Inst Ecoenvironm & Resources, Beiluhe Observat & Res Stn Frozen Soil Engn & Env, Lanzhou 730000, Peoples R China; [Song, Xiaoyan] Southwest Minzu Univ, Inst Qinghai Tibetan Plateau, Chengdu 610041, Peoples R China
推荐引用方式 GB/T 7714	Li, Yang,Wang, Genxu,Bing, Haijian,et al. Watershed scale patterns and controlling factors of ecosystem respiration and methane fluxes in a Tibetan alpine grassland[J]. 中国科学院西北生态环境资源研究院,2021,306.
APA	Li, Yang.,Wang, Genxu.,Bing, Haijian.,Wang, Tao.,Huang, Kewei.,...&Chang, Ruiying.(2021).Watershed scale patterns and controlling factors of ecosystem respiration and methane fluxes in a Tibetan alpine grassland.AGRICULTURAL AND FOREST METEOROLOGY,306.
MLA	Li, Yang,et al."Watershed scale patterns and controlling factors of ecosystem respiration and methane fluxes in a Tibetan alpine grassland".AGRICULTURAL AND FOREST METEOROLOGY 306(2021).