摘要
青藏高原多年冻土区活动层土壤的入渗规律研究是高寒区土壤水循环过程研究的主要内容。以青藏高原多年冻土区高寒沼泽草甸、高寒草甸和高寒草原的活动层土壤为研究对象,裸地为参照对象,分析了不同植被类型土壤的入渗规律及其主要影响因子。结果表明:不同植被类型土壤的入渗能力排序为高寒草原>裸地>高寒草甸>高寒沼泽草甸。高寒草甸土壤中致密的根系对土壤水分的运移具有强烈的阻滞作用,降低了土壤的入渗性能,而高寒草原土壤层根系较为稀疏,对土壤入渗的阻滞作用较弱,土壤水分向深层的渗漏速率较大。通过对比4种土壤入渗模型的模拟结果,发现Horton模型更适用于描述高寒草地土壤水分的入渗过程。另外,不同入渗模型对裸地入渗过程的模拟均优于其他植被类型草地,说明植被类型及植物的生长状况影响土壤入渗过程的模拟效果。全球变暖条件下,多年冻土区土壤入渗研究将为青藏高原多年冻土区陆地水文过程模型提供参数支持,为未来水资源变化研究提供基础数据。
The infiltration law of active layer soil in permafrost area of Qinghai-Tibet Plateau is the main content of soil water cycle process in alpine region.In this study,the active layer soil of alpine swamp meadow,alpine meadow and alpine grassland in permafrost area of Qinghai-Tibet Plateau was selected as the research object,and the bare land was used as the reference object to analyze the infiltration law of soil with different vegetation types and its main influencing factors.The results showed that the infiltration capacity of soil of different vegeta⁃tion types:alpine grassland>bare land>alpine meadow>alpine swamp meadow.This shows that the dense roots in the alpine meadow soil have a strong blocking effect on the movement of soil water and reduce the infil⁃tration performance of the soil,while the roots in the alpine grassland are sparse,the blocking effect on soil infil⁃tration is weak,and the leakage rate of soil water to the deep layer is large.By comparing the simulation results of four soil infiltration models,it is found that Horton model is the most suitable to describe the infiltration pro⁃cess of soil water in alpine grassland.In addition,the simulation of different infiltration models in the process of bare land infiltration is better than that of other vegetation types,indicating that vegetation types and plant growth conditions affect the simulation effect of soil infiltration process.The study on soil infiltration process in permafrost region will provide parameter support for the land hydrological process model of permafrost area of Qinghai-Tibet Plateau under the condition of global warming,and provide basic data for the study of water re⁃sources change in the future.
作者
王一博
吕明侠
赵海鹏
高泽永
WANG Yibo;LÜ Mingxia;ZHAO Haipeng;GAO Zeyong(College of Earth and Environment Science,Lanzhou University,Lanzhou 730000,China;State Key Laboratory of Frozen Soil Engineering,Northwest Institute of Eco-Environment and Resources,Chinese Academy of Sciences,Lanzhou 730000,China)
出处
《冰川冻土》
CSCD
北大核心
2021年第5期1301-1311,共11页
Journal of Glaciology and Geocryology
基金
第二次青藏高原综合科学考察研究项目(2019QZKK0905)
国家自然科学基金项目(41877149,51809222)
国家自然科学基金青年科学基金项目(41901083)
“中央高校基本科研业务费专项资金”战略发展专项项目(lzujbky-2021-sp12)
冻土工程国家重点实验室开放基金项目(SKSLFE201911)资助。
关键词
土壤入渗
青藏高原
多年冻土
入渗模型
soil infiltration
Qinghai-Tibet Plateau
permafrost
infiltration model
