Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau

NWIPB OpenIR

	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 ; Gu Song, Tang Yanhong, Cui Xiaoyong, Kato Tomomichi, Du Mingyuan, Li Yingnian, Zhao Xinquan.Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,2005,129(3-4):175-185
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 &LE; 0 &DEG; C) and non-frozen soil (T-s5 > 0 &DEG; 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 &LE; 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 &LE; 0 &DEG; C) and non-frozen soil (T-s5 > 0 &DEG; 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 &LE; 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.
文献类型	期刊论文
条目标识符	http://210.75.249.4/handle/363003/15209
专题	中国科学院西北高原生物研究所
推荐引用方式 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, Gu Song, Tang Yanhong, Cui Xiaoyong, Kato Tomomichi, Du Mingyuan, Li Yingnian, Zhao Xinquan.Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau.AGRICULTURAL AND FOREST METEOROLOGY,2005,129(3-4):175-185,2005.
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.
MLA	Gu, S,et al."Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau".AGRICULTURAL AND FOREST METEOROLOGY (2005).