| 冻融期东北农田土壤温度和水分变化规律及影响因素分析 |
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| 引用本文： | 赵强,吴从林,罗平安,王康,李红珍,黄介生.冻融期东北农田土壤温度和水分变化规律及影响因素分析[J].冰川冻土,2020,42(3):986-995. |
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| 作者姓名： | 赵强 吴从林 罗平安 王康 李红珍 黄介生 |
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| 作者单位： | 1.武汉大学 水资源与水电工程科学国家重点实验室, 湖北 武汉 430072;2.长江勘测规划设计研究院, 湖北 武汉 430010;3.长江科学院, 湖北 武汉 430010;4.哈达河水库管理处, 黑龙江 鸡西 158100 |
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| 基金项目： | 国家自然科学基金项目(51379152);“十二五”国家重大科技专项(2012ZX07201-006) |
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| 摘 要： | 为了更好地认识季节性冻融区冻融过程对农田土壤温度和水分的影响， 以吉林省长春市黑顶子河流域为研究对象， 监测了冻融期流域内玉米田和水稻田土壤温度和水分的变化过程。结果表明： 冻融期表层土壤温度主要受积雪厚度影响， 深层土壤温度主要受土壤初始含水率影响。冻结期， 冻结层含水率几乎都呈增加趋势， 其中浅层土壤增幅最大； 冻结速度慢、 初始含水量低、 相邻土层含水量高的土层冻结过程水分增加量更大， 反之则小。融化期， 各下垫面、 土层土壤含水率基本呈下降趋势， 且主要集中在表层0 ~ 30 cm， 水分损失以蒸发为主， 冻结层对土壤蒸发有抑制作用； 冻结层的融化是造成各下垫面不同土层土壤含水率差异， 以及各土层在不同融化阶段土壤含水率差异的主要原因。
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| 关 键 词： | 冻融过程 土壤温度 土壤水分 东北 |
| 收稿时间： | 2019-06-05 |
| 修稿时间： | 2019-11-12 |
Variation and influencing factors of soil temperature and moisture during freezing and thawing period in a seasonal freezing agricultural area in Northeast China |
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| Qiang ZHAO,Conglin WU,Ping’an LUO,Kang WANG,Hongzhen LI,Jiesheng HUANG.Variation and influencing factors of soil temperature and moisture during freezing and thawing period in a seasonal freezing agricultural area in Northeast China[J].Journal of Glaciology and Geocryology,2020,42(3):986-995. |
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| Authors: | Qiang ZHAO Conglin WU Ping’an LUO Kang WANG Hongzhen LI Jiesheng HUANG |
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| Institution: | 1.State Key Laboratory of Water Resources and Hydropower Engineering Science，Wuhan University，Wuhan 430072，China;2.Changjiang Institute of Survey，Planning，Design and Research，Wuhan 430010，China;3.Changjiang River Scientific Research Institute，Wuhan 430010，China;4.Hada River Reservoir Management Institute，Jixi 158100，Heilongjiang，China |
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| Abstract: | Northeast China is one of the most important grain producing area in China， which is also the most typical area affected by seasonal freezing and thawing. The freeze-thaw process affects the migration and transformation of water and nutrients in spring farmland by changing the soil evaporation capacity， infiltration capacity and the hydraulic connection between surface water and groundwater. Therefore， studying the variation and influencing factors of soil temperature and moisture during freezing and thawing period is of great significance for guiding water and fertilizer management in seasonal freeze-thaw agriculture areas. However， most of the studies on the effects of freeze-thaw process on soil water migration have just used soil column freezing test， which was carried out using homogeneous soil at the specified freezing and thawing temperature and frequency， and the water migration in the farmland soil could not be well reflected. In order to better understand the effect of freezing-thawing process on soil temperature and moisture variation in a seasonal freezing agricultural areas， six sampling were carried out using soil-drilling method in each sampling location before and during the freezing and thawing period to monitor soil moisture， and temperature probes were pre-embedded to monitor soil temperature. Results show that the surface soil temperature during freezing and thawing period was mainly affected by the thickness of snow， while the deep soil temperature was mainly affected by the initial soil moisture content. During the freezing period， the moisture content of the frozen soil layer almost increased， among which the shallow soil increased the most； and the slower the freezing rate， the lower the initial water content， and the higher the water content of the adjacent soil layer， the more the water content increased of the soil layer. During the thawing period， the soil moisture content of each underlying surface and soil layer was basically decreasing， and this phenomenon mainly occurred in the soil layer of 0 - 30 cm. The water was mainly loss was mainly lost by evaporation， and the frozen soil layer had an inhibitory effect on soil evaporation. The melting of the frozen soil layer was the main reason for the difference in soil moisture content between the underlying surfaces and that between different melting stages. |
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| Keywords: | freezing-thawing process soil temperature soil moisture Northeast China |
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