自然资源学报

自然资源学报 ›› 2012, Vol. ›› Issue (5): 876-882.doi: 10.11849/zrzyxb.2012.05.016

• 资源研究方法 • 上一篇    下一篇

基于地面试验的土壤表面阻抗估算研究

田静1, 苏红波1, 孙晓敏2, 陈少辉1, 杨永民1,3, 荣媛1,3   

  1. 1. 中国科学院 地理科学与资源研究所 陆地水循环及地表过程重点实验室, 北京 100101;
    2. 中国科学院 地理科学与资源研究所 生态系统网络观测与模拟重点实验室, 北京 100101;
    3. 中国科学院 研究生院, 北京 100049
  • 收稿日期:2011-06-17 修回日期:2011-11-28 出版日期:2012-05-20 发布日期:2012-05-20
  • 基金资助:
    国家自然科学基金青年基金项目(40801141,41171286);中国科学院百人计划项目。

Estimation of Soil Surface Resistance Based on Field Experiment

TIAN Jing1, SU Hong-bo1, SUN Xiao-min2, CHEN Shao-hui1, YANG Yong-min1,3, RONG Yuan1,3   

  1. 1. Key Laboratory of Water Cycle and Related Land Surface Processes, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    2. Synthesis Center of Chinese Ecosystem Research Network, Institute of Geographic Sciences and Natural Resources Research, CAS, Beijing 100101, China;
    3. Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2011-06-17 Revised:2011-11-28 Online:2012-05-20 Published:2012-05-20

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摘要： 基于地面试验,利用土壤蒸发计算公式求算土壤水汽阻力的反推法,论文对土壤表面阻抗进行了估算,并研究了土壤表面阻抗与土壤含水量之间的关系。反推法所需参数土壤蒸发量由称重法获得,空气实际水汽压由观测的相对湿度和空气温度数据计算而得,土壤表面饱和水汽压由观测的土壤表面温度计算而得,空气动力学阻抗由观测的涡度相关数据计算而得。研究结果表明,土壤表面阻抗与土壤质量含水量之间存在较好的指数函数关系,即土壤表面阻抗随土壤质量含水量的增加呈指数函数递减,由此说明通过土壤含水量计算土壤表面阻抗是一种新的可行途径。另外,在计算过程中也发现空气动力学阻抗的准确计算是应用反推法获取土壤表面阻抗的最关键因素,也是给此方法带来不确定性最大的因素,较大的空气动力学阻抗误差甚至会使土壤表面阻抗出现负值。

关键词: 土壤表面阻抗, 空气动力学阻抗, 土壤含水量

Abstract: Based on the field experimental data, soil surface resistance was deduced from the theoretical formula of soil evaporation and the relationship between soil surface resistance and soil water content was studied in the paper. Soil evaporation obtained by weighing method, air vapor pressure calculated from relative humidity and air temperature, soil surface saturation vapor pressure calculated from soil surface temperature and aerodynamic resistance obtained by eddy covariance method were used to calculate soil surface resistance. The results showed that there is an obvious exponential function between soil surface resistance and soil water content, namely soil surface resistance exponentially declines with the increase of soil water content, which provides an alternative way of computing soil surface resistance. It should be noted that aerodynamic resistance is the key parameter in the calculation of soil surface resistance. In the study, aerodynamic resistance is derived from the formula of surface sensible heat flux. The error of aerodynamic resistance may even cause negative soil surface resistance value. The accuracy of soil surface resistance is determined by aerodynamic resistance to some extent.

Key words: soil surface resistance, aerodynamic resistance, soil water content

中图分类号: 

  • S152