摘要
以土壤水动力学、冻土物理学、统计学等理论为基础,研究新疆典型干旱区细土平原与沙漠交错带的冻融土壤水热迁移规律,分析不同深度土层在冻结期、融化期的水热变化特征,探明研究区冻融土壤的水分入渗规律及影响因素,以期建立季节性冻融土壤入渗参数的多元线性预报模型。结果表明:土壤冻结融化过程中,深层土壤的液态含水率在冻融过程中基本不随环境温度升降发生变化,各层土壤的液态含水率、温度均与环境温度的变化趋势基本保持一致;冻结期相比融化期在初期短时间内渗入水量较大,达到稳定入渗所需要的时间较短;从冻结期到融化期,随着土壤中冻结水含量减少,未冻水含量增加,土壤的饱和导水率随之变大;土壤入渗能力主要与环境温度、土壤温度、土壤含水率等因素有关,并得出研究区冻融土壤的入渗能力预报模型。
Based on the theories of soil water dynamics,physics of frozen soils and statistics,the law of water and heat transfer in freezingthawing soil of the ecotone between fine soil plain area and desert in typical arid region of Xinjiang was studied,in which the water and heat change characteristics of soils during freezing and thawing period were analyzed.The aims were to explore the law and influential factors of water infiltration of freezethaw soil in the study area and to establish a multiple linear prediction model of soil infiltration parameters in seasonal freezing and thawing.The results show that the moisture content and temperature of each soil layer are substantially consistent with the trend of ambient temperature in the process of freezing and thawing.The moisture content of deep soil layer basically keeps the same when ambient temperature is changed.Compared with the thawing period,the amount of infiltration water is large in a short time,while the time required for stable infiltration is shorter in the process of freezing and thawing.The saturated water conductivity of soil is increased with the decrease of frozen water content and the increase of unfrozen water content during the process from freezing to thawing.The main influential factors of soil infiltration rate are ambient temperature,soil temperature,soil moisture content and soil structure.
作者
陈枭萌
顾宗斌
文方
孜叶尔迭
曾琪静
CHEN Xiaomeng;GU Zongbin;WEN Fang;Ziyeerdie;ZENG Qijing(Xinjiang Academy of Environmental Protection Science,Urumqi 830011,China;Xinjiang Engineering Technology Research Center for Cleaner Production,Urumqi 830011,China;Xinjiang Key Laboratory of Environment Pollution Monitoring and Risk Early Warning,Urumqi 830011,China;Urumqi Environment Monitoring Centre Station,Urumqi 830000,China)
出处
《人民黄河》
CAS
北大核心
2020年第8期158-163,共6页
Yellow River
基金
新疆维吾尔自治区自然科学基金资助项目(2016D01B052)
国家重点研发计划项目(2018YFC1802903)。
关键词
冻融土壤
土壤温度
土壤液态含水率
土壤入渗参数
多元线性预报
freeze⁃thaw soils
soil temperature
soil moisture rate
water infiltration parameters
multiple linear forecast
