文献类型：期刊文献

英文题名：A generalized relationship between thermal conductivity and matric suction of soils

作者：Lu, Sen[1,2] Lu, Yili[3] Peng, Wei[3] Ju, Zhaoqiang[4] Ren, Tusheng[3]

第一作者：陆森;Lu, Sen

通信作者：Lu, YL[1]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, State Forestry Adm, Key Lab Tree Breeding & Cultivat, Beijing 100091, Peoples R China;[2]Nanjing Forestry Univ, Coinnovat Ctr Sustaintable Forestry Southern Chin, Nanjing 210037, Jiangsu, Peoples R China;[3]China Agr Univ, Coll Resources & Environm Sci, Beijing 100193, Peoples R China;[4]Chinese Acad Sci, Inst Genet & Dev Biol, Ctr Agr Resources Res, Shijiazhuang 050021, Hebei, Peoples R China

年份：2019

卷号：337

起止页码：491-497

外文期刊名：GEODERMA

收录：;EI(收录号：20184105925688);Scopus(收录号：2-s2.0-85054422686);WOS:【SCI-EXPANDED(收录号:WOS:000456761500050)】；

基金：The authors would like to thank the editor and three anonymous reviewers for the suggestions to improve this paper. This work was supported by the Fundamental Research Funds of CAF (CAFYBB2017QC001), the Natural Science Foundation of China (No. 41877019, 41671223, 41371240), and the National Key Technology Research and Development Program of China (2015CB150403).

语种：英文

外文关键词：Soil thermal conductivity; Matric suction; Prediction error; Soil water retention curve

摘要：The soil thermal conductivity (lambda) and matric suction of soil water (h, the negative of matric potential) relationship has been widely used in land surface models for estimating soil temperature and heat flux following the McCumber and Pielke (1981, MP81) lambda-h model. However, few datasets are available for evaluating the accuracy and feasibility of the MP81 lambda-h model under various soil and moisture conditions. In this study, we developed a new lambda-h model and compared its performance with that of the MP81 model using measurements on 18 soils with a wide range of textures, water contents and bulk densities. The heat pulse technique was used to measure lambda, and the suction table, micro-tensiometers, pressure plate device, and the dew point potentiometer were applied to obtain soil water retention curves at the appropriate suction ranges. In the range of pF (the common logarithm of h in cm) <= 3, the lambda-h relationships were highly nonlinear and varied strongly with soil texture and bulk density. In the dry range (i.e., pF > 3), there existed a universal lambda-h relationship for all soil textures and bulk densities, and an exponential function was established to describe the relationship. Independent evaluations using lambda-h data on five intact soil samples showed that the new model produced accurate lambda data from pF values with root mean square errors (RMSE) with the range of 0.03-0.18 W m(-1) K-1. While, large errors (RMSEs within 0.17-0.36 W m(-1) K-1) were observed with lambda estimates from the MP81 model.