| 养分含量对土壤冻融特征曲线的影响 |
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| 引用本文： | 陈晓飞,都洋,马巍,张玉龙,李洪升,徐敩祖.养分含量对土壤冻融特征曲线的影响[J].冰川冻土,2004,26(4):440-448. |
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| 作者姓名： | 陈晓飞 都洋 马巍 张玉龙 李洪升 徐敩祖 |
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| 作者单位： | 中国科学院,寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃,兰州,730000;沈阳农业大学,辽宁,沈阳,110161;沈阳农业大学,辽宁,沈阳,110161;中国科学院,寒区旱区环境与工程研究所冻土工程国家重点实验室,甘肃,兰州,730000;大连理工大学,辽宁,大连,116023;中国科学院,寒区旱区环境与工程研究所,冻土工程国家重点实验室,甘肃,兰州,730000 |
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| 基金项目： | 国家重点实验室基金
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辽宁省博士后基金
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国家自然科学基金 |
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| 摘 要： | 土壤冻融特征曲线是反映土壤冻融过程中的水、热、盐迁移规律以及冻土强度、冻土的热性质的重要参数. 为了研究土壤冻融过程中土壤养分的迁移规律, 采用核磁共振法对加入不同浓度的硫酸铵溶液、磷酸二氢钾溶液和氯化钾溶液的土样的冻融特征曲线进行了测定和分析. 结果表明磷酸二氢钾溶液对土壤的冻融特征曲线影响不明显, 氯化钾溶液的影响最明显, 硫酸铵溶液的影响次之. 加入氯化钾溶液的部分试样, 以及加入硫酸铵溶液的部分试样的冻融特征曲线出现了二次突变点. 滞后现象普遍存在于各个试样的冻融特征曲线中, 滞后明显区间所处的温度范围随所加入的溶液浓度的增高而降低. 当加入试样的溶液浓度相同时, 加入氯化钾溶液的滞后明显区间所处的温度范围最低, 加入硫酸铵溶液的次之, 加入磷酸二氢钾溶液的最高.
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| 关 键 词： | 未冻水 土壤养分 核磁共振 突变点 滞后现象 |
| 文章编号： | 1000-0240(2004)04-0440-09 |
| 修稿时间： | 2003年11月18日 |
Effect of Soil Nutrient on the Characteristic Curves of Soil Freezing and Thawing |
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| CHEN Xiao-fei{,},DU Yang,MA Wei,ZHANG Yu-longLI Hong-sheng,XU Xiao-zu ,China, . Shenyang AgriculturalUniversity,Shenyang Liaoning ,China, . Dalian University of Technology,Dalian Liaoning ,China..Effect of Soil Nutrient on the Characteristic Curves of Soil Freezing and Thawing[J].Journal of Glaciology and Geocryology,2004,26(4):440-448. |
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| Authors: | CHEN Xiao-fei{ } DU Yang MA Wei ZHANG Yu-longLI Hong-sheng XU Xiao-zu China Shenyang AgriculturalUniversity Shenyang Liaoning China Dalian University of Technology Dalian Liaoning China |
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| Institution: | CHEN Xiao-fei~{1,2},DU Yang~2,MA Wei~1,ZHANG Yu-long~2LI Hong-sheng~3,XU Xiao-zu~1 730000,China, 2. Shenyang AgriculturalUniversity,Shenyang Liaoning 110161,China, 3. Dalian University of Technology,Dalian Liaoning 116023,China.) |
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| Abstract: | The characteristic curves of soil freezing and thawing reflect the strength, thermal properties and water and solute transport regularity. In order to study the migration of soil nutrient during soil freezing and thawing, the freezing and thawing curves of umber soil, mixed with solutions of (NH-4)-2SO-4, KH-2PO-4 and KCl, respectively, were measured by nuclear magnetic resonance. It was found that the influence of the concentration of KH-2PO-4 on the freezing and thawing curves is insignificant, but that of KCl and (NH-4)-2SO-4 are significant, especially that of KCl. Secondary discontinuous point was found on freezing or thawing characteristic curve of some samples mixed with either KCl or (NH-4)-2SO-4 solutions. Hysteresis widely exists in the freezing and thawing characteristic curves. The temperature range of the obvious hysteresis zone decreases with solute concentration increasing. For the same concentration, the temperature range of the obvious hysteresis zone is the minimum for the samples mixed with KCl solution, followed by that mixed with (NH-4)-2SO-4, and is the maximum for the samples mixed with KH-2PO-4. |
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| Keywords: | unfrozen water soil nutrient nuclear magnetic resonance discontinuous point hysteresis |
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