| 农田黑土季节性冻融过程及其水分分布特征 |
| |
| 引用本文： | 王洋,刘景双,孙崇玉,刘强.农田黑土季节性冻融过程及其水分分布特征[J].土壤通报,2012(1):6-9. |
| |
| 作者姓名： | 王洋 刘景双 孙崇玉 刘强 |
| |
| 作者单位： | 中国科学院东北地理与农业生态研究所 |
| |
| 基金项目： | 国家自然科学基金(41071056);吉林省自然科学基金(20101559)资助 |
| |
| 摘 要： | 秋冬、冬春季节转换过程中0~10 cm农田黑土温度日较差较大,土壤经历着反复的冻融交替过程,大于20 cm的土壤温度日较差逐渐减小,冻融作用对深层土壤的影响逐渐减弱。融冻期土壤融化过程是由地表向下和由季节冻结层底面向上两个方向同时进行;而冻融期土壤冻结过程由土壤表面向下单方向进行。冻融过程中土壤水分发生迁移而重新分布,冻结期上层土壤首先冻结并聚集水分;融化期冻层融化水分向冻结锋面迁移,越靠近冻结层水分含量越大。
|
| 关 键 词： | 冻融作用 水分分布 环境效应 农田黑土 |
Seasonal Freeze-thaw Processes and the Moisture Distribution Characteristics in the Cropland Black Soil |
| |
| WANG Yang,LIU Jing-shuang,SUN Chong-yu,LIU Qiang.Seasonal Freeze-thaw Processes and the Moisture Distribution Characteristics in the Cropland Black Soil[J].Chinese Journal of Soil Science,2012(1):6-9. |
| |
| Authors: | WANG Yang LIU Jing-shuang SUN Chong-yu LIU Qiang |
| |
| Institution: | (Northeast Institute of Geography and Agricultural Ecology,CAS,Changchun 130012,China.) |
| |
| Abstract: | The action of freeze-thaw is one of the important influence factors which can cause the changes of soil physicochemical and biological characteristics.The changes of daily and monthly soil temperature indicated that 0~10 cm topsoil endured a series of the autumn-winter and winter-spring freeze-thaw action and intensely experienced the positive-negative temperature alternative processes in the early morning and at nightfall because the daily ranges of the topsoil temperature were larger than those of other soil layers.The thawing process was downward from the surface layer to the underneath and upward from the seasonal frozen bottom in two directions simultaneously and stably from late March to middle April.The stable freezing process was downward from the soil surface to the underneath in a single direction from late November.The soil moisture transferred and redistributed during the freeze-thaw processes,which the top soil was frozen firstly and the soil moisture gathered here around the frozen layer,and the soil moisture also gathered around the frozen layer and transferred with the frozen frontal migration during the thawing period. |
| |
| Keywords: | Freeze-thaw action Moisture distribution Environmental effect Cropland black soil |
| 本文献已被 CNKI 等数据库收录！ |
