积雪与地表联合覆盖条件下冻融土壤水盐运移规律

发布时间：2018-11-07 09:53

【摘要】：为探索石河子灌区冻融季节积雪与地表联合覆盖条件下土壤水盐运移的变化规律,2015—2016年通过田间小区试验,进行了秸秆、地膜、活性炭3种地表覆盖和裸地对照在整个季节性冻融期土壤水盐时空动态变化规律研究。结果表明;地表覆盖比裸地具有更好的保墒、降盐效果。冻结土壤完全融通后,秸秆、活性炭覆盖出现含水量增幅的最大土层范围分别是0—30,0—40cm,反映出这2种覆盖经历冻融过程后更有利于土壤水分的保持和融雪水的高效利用;活性炭、秸秆、地膜覆盖和裸地在0—30cm土层含盐量相比初始值的增幅分别为18.08%,20.30%,30.91%,32.81%,可见活性炭覆盖下抑制盐分向上运移效果最为显著,秸秆覆盖次之;经历冻融过程,土壤水分和盐分变异性随土壤深度的增加而呈现递减趋势。
[Abstract]:In order to explore the changing rule of soil water and salt migration under the condition of combined snow cover and surface cover in freezing and thawing season in Shihezi irrigation area, the field experiment was carried out in 2015-2016, and straw and mulching film were carried out. The temporal and spatial dynamic changes of soil water and salt in the whole seasonal freezing and thawing period were studied under three kinds of active carbon land cover and bare land control. The results showed that the surface cover had better effect of preserving soil moisture and reducing salt than bare soil. The maximum increase of soil water content in straw and activated carbon mulch was 0-30 ~ 40 cm after the frozen soil was completely melted, which indicated that the two kinds of mulch were more favorable for soil moisture retention and high efficient utilization of snow melting water after the freezing and thawing process. The salt content of activated carbon, straw, plastic film mulching and bare land in 0-30cm soil layer was 18.08 than the initial value, respectively, and 20.30% and 32.81%, respectively. It can be seen that the inhibition effect of active carbon mulch on the upward migration of salt is the most significant. Straw mulch followed; The variability of soil moisture and salt decreased with the increase of soil depth during freezing and thawing.
【作者单位】：石河子大学水利建筑工程学院;
【基金】：国家自然基金新疆联合基金重点项目(u1203282) 地区基金项目(51569028) 石河子大学青年骨干教师培训项目(CZ0245)
【分类号】：S152.7

【相似文献】