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• CN 62-1072/P
• ISSN 1000-0240
• 创刊于1979年
• 主管单位：中国科学院
• 主办单位：中国科学院寒区旱区
•                  环境与工程研究所
•                  中国地理学会

• 寒区科学与技术 •

青藏高原含砂砾石土壤导热率实验研究

1. 1. 中国科学院 西北生态环境资源研究院, 甘肃 兰州 730000;
2. 南通大学, 江苏 南通 226007;
3. 中国科学院大学, 北京 100049
• 收稿日期:2017-01-08 修回日期:2017-02-22 出版日期:2017-04-25 发布日期:2017-07-08
• 通讯作者: 宜树华,E-mail:yis@lzb.ac.cn E-mail:yis@lzb.ac.cn
• 作者简介:何玉洁(1992-),女,甘肃平凉人,2010年在西北师范大学获学士学位,现为中国科学院西北生态环境资源研究院在读硕士研究生,从事陆面生态系统与全球变化方面的研究.E-mail:heyujie92@163.com
• 基金资助:
国家重点基础研究发展计划项目（2013CBA01807）；国家自然科学基金项目（41271089；41422102）资助

Experimental study on thermal conductivity of soil with gravel on the Qinghai-Tibet Plateau

HE Yujie1,3, YI Shuhua1,2, GUO Xinlei1,3

1. 1. Northwest Institute of Eco-Environment and Resources, Lanzhou 730000, China;
2. Nantong University, Nantong 226019, Jiangsu, China;
3. University of the Chinese Academy of Sciences, Beijing 100049, China
• Received:2017-01-08 Revised:2017-02-22 Online:2017-04-25 Published:2017-07-08

Abstract: Soil thermal conductivity is one of the important soil physical parameters and important input parameters of land surface model, which has important implications for the study of soil heat transfer and hydro-thermal coupling movement. Widely used parameterization schemes of soil water and thermal properties only considered the sandy soil, silt and clay. However, soils of the Qinghai-Tibet Plateau (QTP) contain large amount of gravel, which may have different thermal properties. At the current stage, few models simulate the effect of gravel on permafrost dynamcis and alpine grassland on the QTP. In this study, we used the thermal conductivity meter (KD2 Pro, DECAGON, USA) measured soil thermal conductivity of soil samples from the Maduo and Beiluhe on the QTP under different combination of water conditions and thermal states, and analyzed the effects of gravel content on soil porosity and thermal conductivity. Results showed: (1) when moisture content was above a certain threshold value, thermal conductivity in the frozen state is higher than that of unfrozen state; (2) soil moisture content had great influence on soil thermal conductivity; thermal conductivity increased with the increase of water content, as well as it had a sharp increase in the range of less water content; (3) when gravel content in soil sample was larger, soil porosity was smaller and soil thermal conductivity was higher in the frozen state. The results suggested that gravel has a remarkable influence on soil thermal conductivity, and it is necessary to consider the impact of gravel on the soil thermal properties, so as to improve the accuracy of hydrothermal condition simulation in the future.

• S152.8