Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau
Energy exchange between the atmosphere and a meadow ecosystem on the Qinghai-Tibetan Plateau
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DOI：
10.1016/j.agrformet.2004.12.002
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发表时间：
2005-04-30
影响因子：
6.2
通讯作者：
Zhao, XQ
中科院分区：
文献类型：
--
作者：
Gu, S;Tang, YH;Zhao, XQ
为了揭示草地生态系统对气候变化的潜在贡献，我们研究了青藏高原东北部高山嵩草草甸的能量交换。能量交换的年度模式表现出明显的区别时期的冻土与日平均土壤温度在5厘米（Ts 5 0摄氏度）。在冻土期，80%以上的净辐射转化为感热，但在非冻土期，感热随植被的变化而变化较大。后期进一步区分了三个不同的亚时期：（1）波文比（β）> 1的生长前期，β平均值为3.0，净辐射迅速增加，与H、潜热（LE）和土壤热的增加相关;（2）在生长期，β
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 degrees 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 (beta) > 1 was characterized by a high beta 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 beta