摘要
在中国西北干旱、寒冷地区,冻融作用是土壤盐碱化独特的形成机制。该文以内蒙古河套灌区为例,基于田间实测资料,对土壤冻融期间多年水分、盐分和温度的变化规律进行分析。研究结果表明:不同土层各个年度的土壤温度变化规律基本一致,土壤温度的变化滞后于气温的变化,而且滞后时间随着土层深度的增大而增大;气温的降低引起了土壤温度的降低,从而引起水分和盐分的迁移;盐分的时间变异系数(0.30-0.85)大于水分的变异系数(0.02-0.40),说明盐分的运移机制比水分运移机制复杂。该研究结果为河套灌区冻融土壤水热盐耦合模拟的研究和秋浇制度的制定提供了基础理论依据。
Freezing and thawing action is a particular mechanism of soil salinization in the northwestern arid and cold area. Taking Inner Mongolia Hetao Irrigation District as an example, based on the observed field data, the variation laws of soil temperature, soil moisture and soil salt during freezing and thawing period were analyzed. Results show that the variation laws of soil temperature at the different soil layers are consistent. Variation of soil temperature lags to air temperature. With the soil depth increasing, lag interval increases also. Decrease of air temperature results in that of soil temperature, which leads to water and salt transfer. Temporal variability coefficient of salt （0.30- 0.85） is larger than that of water （0.02-0.40）. Salt transfer mechanism is more complex than water transfer mechanism. Research provides the foundation for the water-heat-salt coupling simulation on freezing-thawing soils and the establishment of autumn irrigation schedule in Hetao Irrigation District.
出处
《农业工程学报》
EI
CAS
CSCD
北大核心
2007年第4期70-74,共5页
Transactions of the Chinese Society of Agricultural Engineering
基金
内蒙古自然科学基金重点项目(200508010303)
关键词
河套灌区
冻融土壤
水盐
耦合运移
秋浇
Hetao Irrigation District
freezing and thawing soils
water-salt
coupling transfer
autumn irrigation
