DOI: 10.1016/j.atmosenv.2017.11.053
Scopus记录号: 2-s2.0-85036464061
论文题名: Grazing exclusion increases soil CO2 emission during the growing season in alpine meadows on the Tibetan Plateau
作者: Guo N ; , Wang A ; , Allan Degen A ; , Deng B ; , Shang Z ; , Ding L ; , Long R
刊名: Atmospheric Environment
ISSN: 0168-2563
EISSN: 1573-515X
出版年: 2018
卷: 174 起始页码: 92
结束页码: 98
语种: 英语
英文关键词: Alpine meadow
; Alpine shrub meadow
; Grazing exclusion
; Soil CO2 emission
; Soil temperature
; Tibetan Plateau
Scopus关键词: Carbon dioxide
; Global warming
; Temperature
; Vegetation
; Alpine meadow
; Alpine shrub meadow
; CO2 emissions
; Grazing exclusion
; Soil temperature
; Tibetan Plateau
; Soils
; carbon cycle
; carbon dioxide
; carbon emission
; carbon sequestration
; global warming
; grassland
; growing season
; meadow
; soil temperature
; air temperature
; Article
; carbon cycle
; carbon footprint
; carbon sequestration
; carbon storage
; circadian rhythm
; controlled study
; domestic sheep
; fertilizer application
; gas analysis
; grassland
; grazing
; greenhouse effect
; growing season
; livestock
; nonhuman
; priority journal
; seasonal variation
; shrub
; soil chemistry
; soil respiration
; soil temperature
; yak
; China
; Qinghai-Xizang Plateau
Scopus学科分类: Environmental Science: Water Science and Technology
; Earth and Planetary Sciences: Earth-Surface Processes
; Environmental Science: Environmental Chemistry
英文摘要: Soil CO2 emission is a key part of the terrestrial carbon cycle. Grazing exclusion by fencing is often considered a beneficial grassland management option to restore degraded grassland, but its effect on soil CO2 emission on the northeastern Tibetan Plateau is equivocal and is the subject of this study. Using a closed static chamber, we measured diurnal soil CO2 flux weekly from July, 2008, to April, 2009, in response to grazing and grazing exclusion in the alpine meadow and alpine shrub meadow. Concomitantly, soil temperature was measured at depths of 5 cm, 10 cm, 15 cm and 20 cm with digital temperature sensors. It emerged that: 1) non-grazed grasslands emitted more soil CO2 than grazed grasslands over the growing season; 2) the alpine shrub meadow emitted more soil CO2 than the alpine meadow; the annual cumulative soil CO2 emissions of alpine meadow and alpine shrub meadow were 241.5–326.5 g C/m2 and 429.0–512.5 g C/m2, respectively; 3) seasonal patterns were evident with more soil CO2 flux in the growing than in the non-growing season; and 4) the diurnal soil CO2 flux exhibited a single peak across all sampling sites. In addition, soil CO2 flux was correlated positively with soil temperature at 5 cm, but not at the other depths. We concluded that grazing exclusion enhanced soil CO2 emission over the growing season, and decreased carbon sequestration of alpine meadow and alpine shrub meadow on the northeastern Tibetan Plateau. Since an increase in soil temperature increased soil CO2 flux, global warming could have an effect on soil CO2 emission in the future. © 2017 Elsevier Ltd Citation statistics:
资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/83096
Appears in Collections: 气候变化事实与影响
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作者单位: School of Life Sciences, State Key Laboratory of Grassland Agro-Ecosystems, Lanzhou University, Lanzhou, Gansu Province, China; Desert Animal Adaptations and Husbandry, Wyler Department of Dryland Agriculture, Blaustein Institutes for Desert Research, Ben-Gurion University of Negev, Beer Sheva, Israel
Recommended Citation:
Guo N,, Wang A,, Allan Degen A,et al. Grazing exclusion increases soil CO2 emission during the growing season in alpine meadows on the Tibetan Plateau[J]. Atmospheric Environment,2018-01-01,174