[1]范继辉,鲁旭阳,王小丹.藏北高寒草地土壤冻融循环过程及水热分布特征[J].山地学报,2014,(04):385.
　FAN Jihui,LU Xuyang,WANG Xiaodan.The Freezing-Thawing Processes and Soil Moisture-Energy Distribution in Permafrost Active Layer, Northern Tibet[J].Mountain Research,2014,(04):385.
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藏北高寒草地土壤冻融循环过程及水热分布特征()
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《山地学报》[ISSN:1008-2186/CN:51-1516]

卷:
期数:
2014年04期
页码:
385
栏目:
青藏高原土壤
出版日期:
2014-04-01

文章信息/Info

Title:
The Freezing-Thawing Processes and Soil Moisture-Energy Distribution in Permafrost Active Layer, Northern Tibet
作者:
范继辉; 鲁旭阳; 王小丹
中国科学院水利部成都山地灾害与环境研究所，山地表生过程与生态调控重点实验室，四川 成都 610041
Author(s):
FAN Jihui; LU Xuyang; WANG Xiaodan
Key Laboratory of Mountain Surface Processes and Ecological Regulation, Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, Chengdu 610041, China.
关键词:
藏北高寒草地; 冻融循环; 水热特征; 土壤水方动态
Keywords:
freerinythawiny cycle;  alpine grassland; soil temperature;  soil maisture dgnamics
分类号:
S153，S152
文献标志码:
A
摘要:
利用活动层土壤剖面的温度、水分观测资料，系统研究了藏北高寒草地多年冻土活动层土壤的冻融过程及其水热分布特征。研究表明：1土壤剖面温度随气温发生周期性波动，具有明显的滞后效应，且随深度增加变幅减小；2土壤剖面完全冻结天数为109~123 d，日冻融循环主要发生在表层（0~10 cm）土层中，冻融过程可分为不稳定冻结期、完全冻结期、不稳定消融期、和消融期4个阶段；3受冻融作用影响，土壤含水量呈现“凹”型变化，变化趋势与土壤温度有较好的一致性；4冻融作用有利于维持藏北高寒草地土壤水分，在季节转换，生态系统碳、氮循环中具有重要作用。
Abstract:
Based on the insitu highresolution observationsoil moisture and temperature data obtained in the permafrost active layer soil profilein Xainza County, Northern Tibet, the processes of freezingthawingand distribution characteristics of soil energy and moisture on season shift were discussed. The results show that: 1) the process of soil seasonally freezingthawing strongly depended on the soil temperature, the soil temperature in active layer shows a cycle variation and lag with air temperature, and the variation range is decreased with the increase of soil depth. 2) There are 109~123 days that soil profile was completely frozen, the daily freeingthawing cycle occurs mainly in surface soil layer (0~10 cm). According to the characteristics of different periods, the freezingthawing cycle could be divided into 4 stages.3) Affected by freezingthawing cycle, the curve of unfrozen soil moisture shows “decreasingat the lowestincreasing” shape, the trend matched with the change of soil temperature. 4) The processes of freezingthawing could maintain soil moisture from restraining soil evaporation, which may play an important role in the seasonal shift, carbon and nitrogen cycle of alpine grassland ecosystem in Northern Tibet.

相似文献/References:

[1]李卫朋,范继辉,沙玉坤,等.藏北高寒草原土壤温度变化与冻融特征[J].山地学报,2014,(04):407.
　LI Weipeng,FAN Jihui,SHA Yukun,et al.Soil Temperature Variation and Thawfreezing Cycle in the Alpine Cold Steppe，Northern Tibetan Plateau[J].Mountain Research,2014,(04):407.

备注/Memo

备注/Memo:
收稿日期(Received date)：2013-12-11；改回日期(Accepted) : 2014-05-05。
基金项目（Foundation item）：国家自然科学基金（41001018）；水利部公益性行业专项（201301037）；中科院成都山地所青年百人项目。\[National Nafural Seience Foundation of China(41001018),Ministry of Water Resources special funds for scieneific research,One hundred young Persons Projece of inde (SDSQB-201002)causes(201301037).\]
作者简介（Biography）：范继辉（1980-），汉族，河南开封人、博士、副研究员、主要从事工程水文学、生态水文学研究。\[Fan Jihui(1980-),born in Henan Ph D,Associate professor,majoring in engineering hydrology and ecohydrology.\] E-mal:jhfan@inde.ac.cn *
通信作者(Author for correspondence)：wxd@imde.ac.cn
更新日期/Last Update: 1900-01-01