摘要
利用新疆焉耆盆地土壤田间水盐试验资料,用地下水和土壤水动力学方法,从灌溉条件下土壤水、地下水、盐分运动机理着手,对地下水浅埋区(埋深小于或等于2m)水平排水条件下的农田地下水、土壤水和表层(0～30cm)土壤盐分变化进行对比分析。结果表明:在浅埋区水平排水条件下,土壤水库调蓄能力较弱,地下水埋深变幅在1.10～1.60m,水位变化大,地下水对土壤水补给为农田蒸散发的主要来源;土壤盐分的变化与地下水埋深的动态变化密切相关(负相关系数为0.75),土壤因蒸发而积盐的过程发生在地下水位从高到低的回降过程中,水位回降越慢,土壤积盐越多(积盐率最高可达50.36%),导致土壤盐渍化的发生。
Based on field water and salt experiments data and by the means of groundwater and soil water hydrodynamic, contrast to groundwater, soil water and the variety of surface layer salt from groundwater, soil water and salt movement mechanism under irrigation, the results show that the soil reservoir action is rather weak and the variety of groundwater level is rather big in shallow depth area (≤2 m)under level drainage, the main water source of farm evaporation and transpiration is recharged to soil water by groundwater; the variety of salt is relation to groundwater level dynamic change and the coefficient of negative correlation is 0.75, the process of accumulated salt occurs in the drop process of groundwater level from high to low, the more level drops slow, the more soil accumulates salt, the rate of accumulate salt is 50.36% and results in soil salinization.
出处
《新疆农业大学学报》
CAS
2004年第3期52-56,共5页
Journal of Xinjiang Agricultural University
基金
世界银行贷款项目(TBZJ-005)
新疆水利水电工程重点学科基金资助项目(2004003)
关键词
地下水浅埋区
水平排水
水盐运移
土壤水矿化度
groundwater shallow depth area
horizontal drainage
salt and water movement soil water mineralization
