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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
发表期刊AGRICULTURAL AND FOREST METEOROLOGY
卷号129期号:3-4页码:175-185
文章类型Article
摘要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.; 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.
关键词Albedo Bowen Ratio Eddy Covariance Energy Balance Soil Water Content
WOS标题词Science & Technology ; Life Sciences & Biomedicine ; Physical Sciences
学科领域农业科学
关键词[WOS]BALANCE CLOSURE ; SURFACE ; FLUXES ; CARBON ; FEEDBACKS
收录类别SCI
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:000228813100005
引用统计
被引频次:76[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://210.75.249.4/handle/363003/1374
专题中国科学院西北高原生物研究所
作者单位1.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
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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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