收稿日期: 2012-10-10
修回日期: 2012-11-07
网络出版日期: 2012-11-07
Characteristics of Soil Temperature, Moisture and Heat Pro- and Post-precipitation in Semiarid Grassland over Longzhong Loess Plateau
Received date: 2012-10-10
Revised date: 2012-11-07
Online published: 2012-11-07
本文利用兰州大学半干旱气候与环境观测站(简称SACOL站）陆面过程综合观测资料,分析了强降水前后榆中黄土高原半干旱草地土壤温、湿特征的差异,讨论了水分状况对土壤热力参数及地表能量分配的影响。结果表明:水分胁迫条件下,黄土高原半干旱草地土壤在10 cm深度存在一个湿层;强降水过程可使土壤湿度受影响范围接近40 cm深度。水分胁迫条件下,感热通量是黄土高原半干旱草地生态系统能量分配过程中净辐射的最大消耗项;无水分胁迫条件下,潜热通量是能量平衡系统中净辐射分量的最大消耗项。降水改变了土壤湿度并使得土壤热传导率发生变化,土壤热传导系数和土壤热容量随土壤湿度增加而增大。
岳 平1 , 2 , 张 强1 , 王 胜1 , 王润元1 , 李宏宇1 , 王若安1 . 黄土高原半干旱草地降水前后土壤的温、湿度及热力特征[J]. 中国沙漠, 2013 , 33(6) : 1766 -1774 . DOI: 10.7522/j.issn.1000-694X.2013.00263
By using the radiation, turbulence flux, soil temperature and soil moisture, and soil heat flux data recorded at the Semi-Arid Climate and Environment Observatory of Lanzhou University（SOCAL）in June 2008, the influence of water stress on soil moisture, temperature and soil thermal parameters for semi-arid grassland on the Loess Plateau were studied. The influence of water stress on energy fluxes and partitioning in semi-arid grassland were also discussed. The results suggest that a wetting layer exists at a depth of 10 cm under the surface of the semi-arid Loess Plateau grassland soil. Under the condition of water stress, heavy precipitation allows soil moisture to be affected as deep as 40 cm below the surface. When this occurs, the sensible heat flux of net radiation energy is mostly consumed during energy distribution of the Loess Plateau semi-arid grassland ecosystem. However, in the absence of water stress, the latent heat flux consumes most of the net radiation components of the energy balance system.
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