Energy partitioning and its biophysical controls above a grazing steppe in central Mongolia
文献类型：SCI/SSCI论文
| 作者 | Li S. G. ; Eugster W. ; Asanuma J. ; Kotani A. ; Davaa G. ; Oyunbaatar D. ; Sugita M. |
| 发表日期 | 2006 |
| 关键词 | Mongolian temperate steppe Eddy covariance energy partitioning latent heat sensible heat soil heat flux canopy surface conductance Bowen ratio carbon-dioxide exchange land-use changes surface conductance water-vapor stomatal conductance environmental-regulation temperate grassland flux measurements balance closure boundary-layer |
| 英文摘要 | The objective of this paper was to explore the seasonal development of how net all-wave radiation (R.) above a typical steppe in central Mongolia is partitioned into the three components: sensible heat (H), latent heat and soil heat (G) flux. Seasonal variability of this partitioning in association with biotic and abiotic variables was addressed in detail using the evaporative fraction of R-n (E-F) and the canopy surface conductance (g,), which was derived from an inversion of the Penman-Monteith equation. The surface energy partitioning of this steppe ecosystem showed the following characteristics: (1) H dominated the energy partitioning, followed by a relatively large G, although this pattern was temporally altered under conditions when the canopy surface was wet and the vegetation was fully developed; (2) the correlation of the energy partitioning with canopy development and soil moisture conditions explained up to 79% of the observed variance in EF and g,. Both factors exhibited linear correspondences to leaf area index (A(L)) or soil water content (theta); (3) the effect of atmospheric vapour pressure deficit (delta e) on g(c) (R-2 = 0.97) was curvilinear and strongly influenced the energy partitioning. Due to the limitation of water supply, both EF and gc decreased significantly with increasing delta e; (4) the effect of short-wave solar radiation (K-d) on E-F and g(c) depended strongly on soil moisture conditions. When soil moisture was high, EF still showed a decrease with increasing Kd while g, seemed insensitive to Kd; and (5) on the daily scale, close coupling of the canopy with the atmosphere was often observed in the afternoon as represented by the declining role played by g(c) in lambda E and E-F. However, on the seasonal scale, variations in E-F and g(c) closely followed the variation in A(L) and the precipitation events or the dry-wet cycles at the site. (c) 2006 Elsevier B.V. All rights reserved. |
| 出处 | Agricultural and Forest Meteorology |
| 卷 | 137 |
| 期 | 1-2 |
| 页 | 89-106 |
| 收录类别 | SCI |
| 语种 | 英语 |
| ISSN号 | 0168-1923 |
| 源URL | [http://ir.igsnrr.ac.cn/handle/311030/23618]  |
| 专题 | 地理科学与资源研究所_历年回溯文献 |
| 推荐引用方式 GB/T 7714 | Li S. G.,Eugster W.,Asanuma J.,et al. Energy partitioning and its biophysical controls above a grazing steppe in central Mongolia. 2006. |
入库方式： OAI收割
来源：地理科学与资源研究所
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