不同类型结皮影响下土壤水分的变化规律

发布时间：2018-05-13 16:59

本文选题：库布齐沙漠 + 生物结皮　；参考：《内蒙古师范大学学报(自然科学汉文版)》2017年03期

【摘要】：通过对库布齐沙漠不同类型结皮覆盖下不同深度土壤含水量的野外动态监测和室内实验测定,研究了不同类型结皮与土壤水因子的相互影响关系,结果表明:(1)土壤含水量在不同类型结皮影响下,随土层深度的增加,生物结皮表现为先下降后升高的趋势,物理结皮则表现为一直升高的趋势.(2)同一土层土壤含水量差异显示,0~5cm藓结皮和藻结皮与物理结皮土层含水量差异显著(P0.05),而藓结皮和藻结皮土层含水量只在降雨后差异显著(P0.05);5~10cm土层含水量只有藓结皮与物理结皮及降雨后藻结皮与物理结皮差异显著(P0.05);深层土壤含水量差异均不显著.(3)不同类型结皮影响下不同土层土壤水分含量日动态变化受土壤水分蒸发、深层土壤水和大气凝结水补给的影响,均显示8:00~16:00下降、16:00~8:00上升的规律.日变化幅度显示降雨前较小,降雨后明显增大;降雨后表层变幅最大,深层土层变幅最小;表层物理结皮降幅最大,藓结皮升幅最大.(4)生物结皮增加了表层土壤持水力,对深层土壤持水力几乎没有影响.
[Abstract]:The relationship between different types of crust and soil water factors was studied through field dynamic monitoring and laboratory measurement of soil water content at different depths under different types of crust cover in Kubuqi Desert. The results showed that under the influence of different types of crust, the biological crust decreased first and then increased with the increase of soil depth. The difference of soil water content in the same soil layer shows that there is a significant difference in water content between moss crust and algal crust in the same soil layer (P 0.05), but the water content in the soil layer of moss crust and algal crust is only after rainfall. The difference of soil water content between moss crust and physical crust, algal crust and physical crust after rainfall was significant (P 0.05), but the difference of water content in deep soil was not significant under the influence of different types of crust. The daily dynamic change is affected by the evaporation of soil moisture, The effects of deep soil water and atmospheric condensate water recharge show the law of rising from 8: 00 to 16: 00 and from 16: 00 to 8: 00. The range of diurnal variation showed that the amplitude of diurnal change was smaller before and after rainfall, the maximum variation of surface layer and the smallest amplitude of change of deep soil layer after rainfall, and the largest decrease of surface physical crust and the biggest increase of moss crust. 4) Biological crust increased the water holding capacity of surface soil. It has little effect on the water holding capacity of deep soil.
【作者单位】：内蒙古兴安职业技术学院农牧系;通辽职业学院化工系;内蒙古师范大学生命科学学院;
【基金】：国家自然科学基金资助项目(30860063,30660027,30660105) 内蒙古自然科学基金资助项目(2012MS0512,2016MS0363) 内蒙古人才开发基金项目
【分类号】：S152.7

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