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Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau
Gu, S; Tang, YH; Cui, XY; Kato, T; Du, MY; Li, YN; Zhao, XQ
2005-04-30
Source PublicationAGRICULTURAL AND FOREST METEOROLOGY
Volume129Issue:3-4Pages:175-185
SubtypeArticle
AbstractTo reveal the potential contribution of grassland ecosystems to climate change, we examined the energy exchange over an alpine Kobresia meadow on the northeastern Qinghai-Tibetan Plateau. The annual pattern of energy exchange showed a clear distinction between periods of frozen soil with the daily mean soil temperature at 5 cm (T-s5 ≤ 0 ° C) and non-frozen soil (T-s5 > 0 ° C). More than 80% of net radiation was converted to sensible heat (H) during the frozen soil period, but H varied considerably with the change in vegetation during the non-frozen soil period. Three different sub-periods were further distinguished for the later period: (1) the pre-growth period with Bowen ratio (β) > 1 was characterized by a high β of 3.0 in average and the rapid increase of net radiation associated with the increases of H, latent heat (LE) and soil heat; (2) during the Growth period when β ≤ 1, the LE was high but H fluxes was low with β changing between 0.3 and 0.4; (3) the post-growth period with average β of 3.6 when H increased again and reached a second maximum around early October. The seasonal pattern suggests that the phenology of the vegetation and the soil water content were the major factors affecting the energy partitioning in the alpine meadow ecosystem. © 2005 Elsevier B.V. All rights reserved.; To reveal the potential contribution of grassland ecosystems to climate change, we examined the energy exchange over an alpine Kobresia meadow on the northeastern Qinghai-Tibetan Plateau. The annual pattern of energy exchange showed a clear distinction between periods of frozen soil with the daily mean soil temperature at 5 cm (T-s5 ≤ 0 ° C) and non-frozen soil (T-s5 > 0 ° C). More than 80% of net radiation was converted to sensible heat (H) during the frozen soil period, but H varied considerably with the change in vegetation during the non-frozen soil period. Three different sub-periods were further distinguished for the later period: (1) the pre-growth period with Bowen ratio (β) > 1 was characterized by a high β of 3.0 in average and the rapid increase of net radiation associated with the increases of H, latent heat (LE) and soil heat; (2) during the Growth period when β ≤ 1, the LE was high but H fluxes was low with β changing between 0.3 and 0.4; (3) the post-growth period with average β of 3.6 when H increased again and reached a second maximum around early October. The seasonal pattern suggests that the phenology of the vegetation and the soil water content were the major factors affecting the energy partitioning in the alpine meadow ecosystem. © 2005 Elsevier B.V. All rights reserved.
KeywordAlbedo Bowen Ratio Eddy Covariance Energy Balance Soil Water Content
WOS HeadingsScience & Technology ; Life Sciences & Biomedicine ; Physical Sciences
Subject Area农业科学
WOS KeywordBALANCE CLOSURE ; SURFACE ; FLUXES ; CARBON ; FEEDBACKS
Indexed BySCI
Language英语
WOS Research AreaAgriculture ; Forestry ; Meteorology & Atmospheric Sciences
WOS SubjectAgronomy ; Forestry ; Meteorology & Atmospheric Sciences
WOS IDWOS:000228813100005
Citation statistics
Cited Times:85[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://210.75.249.4/handle/363003/1374
Collection中国科学院西北高原生物研究所
Affiliation1.Natl Inst Environm Studies, Tsukuba, Ibaraki 3058506, Japan
2.Chinese Acad Sci, NW Plateau Inst Biol, Xining 810001, Peoples R China
3.Univ Tsukuba, Tsukuba, Ibaraki 3058577, Japan
4.Natl Inst Agroenvironm Sci, Tsukuba, Ibaraki 3058604, Japan
Recommended Citation
GB/T 7714
Gu, S,Tang, YH,Cui, XY,et al. Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau[J]. AGRICULTURAL AND FOREST METEOROLOGY,2005,129(3-4):175-185.
APA Gu, S.,Tang, YH.,Cui, XY.,Kato, T.,Du, MY.,...&Zhao, XQ.(2005).Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,129(3-4),175-185.
MLA Gu, S,et al."Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau".AGRICULTURAL AND FOREST METEOROLOGY 129.3-4(2005):175-185.
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