| 吉林省土壤冻融的逐日变化及与气温、 地温的关系 |
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| 引用本文： | 任景全,王冬妮,刘玉汐,李建平,郭春明,李琪.吉林省土壤冻融的逐日变化及与气温、 地温的关系[J].冰川冻土,2019,41(2):324-333. |
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| 作者姓名： | 任景全 王冬妮 刘玉汐 李建平 郭春明 李琪 |
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| 作者单位： | 吉林省气象科学研究所,吉林 长春,130062;吉林省气象台,吉林 长春,130062;江苏省农业气象重点实验室,江苏 南京,210044 |
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| 基金项目： | 公益性行业（气象）科研专项（GYHY201206018；GYHY201506001）；吉林省重点科技攻关项目（20150204014NY）资助 |
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| 摘 要： | 土壤冻融过程对气候和生态环境演变有重要影响。为了研究季节冻土区土壤冻融过程及其对气候变化的响应，利用2014-2017年吉林省典型代表观测站逐日冻土、气温和地温数据，研究土壤冻融的逐日变化及其与气温、地温的关系。结果表明：在土壤冻结和融化完整过程中，冻土上限呈直线上升趋势变化，下限呈先增大后减小的三次曲线趋势变化，即从稳定冻结初日起，冻土深度逐渐加深，在达到最大值后，缓慢变浅。冻土融化包括下限和上限融化两个过程，具有“两头化”的变化特征。冻土上限融化与下限同时开始或者晚于下限，但冻土上限融化的日变化量要大于下限。在土壤冻结过程中，活动积温、0 cm地积温、10 cm地积温与冻结深度呈三次曲线变化关系，随负积温的增加，冻结深度加深。在冻土上限融化过程中，活动积温、0 cm地积温、10 cm地积温与冻土上限深度呈三次曲线变化关系，随正积温的增加，上限融化深度加深。在冻土下限融化过程中，活动积温、0 cm地积温、160 cm地积温与冻土下限深度呈显著的直线趋势，随正积温的增加，下限融化深度变浅。
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| 关 键 词： | 土壤冻结 土壤融化 活动积温 地积温 吉林省 |
| 收稿时间： | 2018-05-02 |
| 修稿时间： | 2019-03-01 |
Daily variation of soil freezing-thawing and its relationship with air and soil temperature in Jilin Province |
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| REN Jingquan,WANG Dongni,LIU Yuxi,LI Jianping,GUO Chunming,LI Qi.Daily variation of soil freezing-thawing and its relationship with air and soil temperature in Jilin Province[J].Journal of Glaciology and Geocryology,2019,41(2):324-333. |
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| Authors: | REN Jingquan WANG Dongni LIU Yuxi LI Jianping GUO Chunming LI Qi |
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| Institution: | 1. Institute of Meteorological Science of Jilin Province, Changchun 130062, China;2. Jilin Meteorological Observatory, Changchun 130062, China;3. Jiangsu Key Laboratory of Agricultural Meteorology, Nanjing 210044, China |
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| Abstract: | The process of soil freezing and thawing has an important influence on the evolution of climate and ecological environment. In order to study the soil freezing and thawing process and its response to climate change in the seasonal frozen soil region, the daily variation of soil freezing and thawing process and its relationship with air temperature and soil temperature were analyzed based on the observation data of frozen soil, air temperature and soil temperature of the four typical representative stations from 2014 to 2017 in Jilin Province. The results showed that the upper limit of frozen soil showed a linear upward trend, and the lower limit value showed a trend of three times curve in the whole process of soil freezing and thawing. From the beginning of stable freezing, the lower limit of frozen soil increased gradually, and it decreased slowly after reached the maximum. The process of soil thawing include the lower and upper soil thawing. The upper limit of frozen soil have thawed at the same time or later than lower limit, but the daily variation of soil thawing of the upper limit was greater than the lower limit. During the soil freezing process, the accumulated air temperature, accumulated soil temperature at 0 cm, accumulated soil temperature at 10 cm and the depth of freezing had three times curve relationship, with the increase of negative accumulated temperature, the depth of freezing increased. The accumulated air temperature, accumulated soil temperature at 0 cm, accumulated soil temperature at 10 cm and the depth of upper limit of frozen soil had three times curve relationship in the process of upper limit of soil thawing, with the increase of positive accumulated temperature, the depth of upper limit of frozen soil increased. During the process of lower limit of soil thawing, the accumulated air temperature, accumulated soil temperature at 0 cm, accumulated soil temperature at 160 cm and the depth of lower limit of frozen soil showed a linear trend significantly. The depth of lower limit of frozen soil decreased with the increase of positive accumulated air temperature, the depth of frozen soil was shallower. |
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| Keywords: | soil freezing soil thawing accumulated air temperature accumulated soil temperature Jilin Province |
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