干旱区研究2025，Vol.42Issue(12)：2195-2206,12.DOI:10.13866/j.azr.2025.12.04
青藏高原高寒草甸草原土壤冻融过程中地-气水热交换特征
Characteristics of land-atmospheric water and heat exchange during soil freezing-thawing process of alpine grassland soils on the Qinghai-Xizang Plateau
摘要
Abstract
Using soil temperature,humidity and eddy observation data from the Haibei Pastoral Experiment Sta-tion of the China Meteorological Administration(hereinafter referred to as Haibei station),we analysed the char-acteristics of land-atmospheric water and heat exchange during soil freezing-thawing process of typical alpine meadowed grassland soils on the Qinghai-Xizang Plateau.The results showed that:(1)the soil freezing and thaw-ing process significantly affected the shallow soil temperature and humidity.The soil temperature was the lowest during the stable freezing period(-13.8℃)and the highest during the complete thawing period(23.3℃),while soil humidity decreased to 5.7%during the stable freezing period and increased to 24.7%during the complete thawing period.(2)Soil freezing and thawing processes significantly changed the surface energy distribution,es-pecially during the freeze-thaw transition season.Net radiation was highest during the complete thaw period(107.1 W·m-2)and lowest during the stable freeze period(8.9 W·m-2),and was mainly consumed by sensible and latent heat,accounting for 45.1%and 49.7%of the year,respectively.During the complete thaw(stable freeze)period,latent heat(sensible)fluxes predominated,whereas during the thaw(freeze)period,both were dominated by sensible heat fluxes.During the complete melting(stable freezing)period,the latent heat(sensible heat)flux was dominant,while during the ablation(freezing)period,the sensible heat flux was dominant.(3)The daily changes of temperature,humidity and energy fluxes in the shallow soil showed a single-peak pattern.The daily variation of soil temperature was the largest(10.9℃)during the complete melting period on sunny day and the smallest(1.8℃)during the freezing period,the daily variation of soil humidity was small,with a maximum of 1.5%during the melting period.The daily variation of net radiation was the largest(635.7 W·m-2)during the complete melting period,and the variation of latent heat fluxes was the largest(197.5 W·m-2),the variation of sensible heat flux reached its maximum during the melting period(315.1 W·m-2),while the variation of surface heat flux peaked during the stable freeze period(180.0 W·m-2).The weather type and the freeze-thaw phase joint-ly regulate the soil temperature and humidity changes,and influence the energy distribution by regulating the radi-ation input and the soil phase change.关键词
青藏高原/土壤冻融/水热交换/能量通量Key words
Qinghai-Xizang Plateau/soil freezing and thawing/water-heat exchange/energy fluxes引用本文复制引用
CAO Xiaoyun,ZHOU Bingrong,YAN Yuqian,QUAN Chen,ZHAO Quanning,LI Quanping,WANG Xiuying,LI Fu..青藏高原高寒草甸草原土壤冻融过程中地-气水热交换特征[J].干旱区研究,2025,42(12):2195-2206,12.基金项目
国家自然科学基金项目(U21A2021) （U21A2021）
国家重点研发计划项目(2022YFF1302601) （2022YFF1302601）
