浑水特性对膜孔灌土壤颗粒组成及分形特征的影响  

Effects of muddy water characteristics on soil particle composition and fractal characteristics under film hole irrigation

作　　者：钟韵 费良军[3] 朱士江[1] 何军[1] 康守旋 ZHONG Yun;FEI Liang-jun;ZHU Shi-jiang;HE Jun;KANG Shou-xuan(Engineering Research Center of Eco-environment in Three Gorges Reservoir Region,Ministry of Education,China Three Gorges University,Yichang Hubei 443002;Water Conservancy and Environmental Sciences,China Three Gorges University,Yichang Hubei 443002;State Key Laboratory of Eco-hydraulics in Northwest Arid Region,Xi’an University of Technology,Xi’an Shaanxi 710048)

机构地区：[1]三峡大学三峡库区生态环境教育部工程研究中心,湖北宜昌443002 [2]三峡大学水利与环境学院,湖北宜昌443002 [3]西安理工大学省部共建西北旱区生态水利国家重点实验室,陕西西安710048

出　　处：《中国土壤与肥料》2023年第1期184-190,共7页Soil and Fertilizer Sciences in China

基　　金：国家自然科学基金(52079105、52000120);湖北省水利重点科研项目(HBSLKY201919)。

摘　　要：为探明浑水灌溉条件下泥沙对土壤结构的影响,通过浑水膜孔灌自由入渗室内试验,设置4种典型泥沙颗粒级配组成(以粒径小于0.01 mm的物理性黏粒含量d_(0.01)量化,9.87%、20.48%、28.68%、37.39%)和2种浑水含沙率(3%、12%),共8个处理,研究浑水特性对膜孔灌土壤颗粒组成及其分形特征的影响。结果表明:浑水特性对膜孔灌土壤颗粒组成影响较大,落淤层土壤细颗粒相对含量均低于浑水泥沙,其随着浑水含沙率和d_(0.01)的增加而增加;滞留层土壤颗粒组成与落淤层相反,细颗粒相对含量均高于原土壤,其随着浑水含沙率和d_(0.01)的增加而显著增加;浑水含沙率和d_(0.01)两者的交互作用对滞留层各深度的土壤黏粒和砂粒相对含量影响也均显著。滞留层土壤颗粒分形维数均大于原土壤的分形维数,在0~2 cm范围两者差异最大,随着入渗土层深度的增大,土壤分形维数增加越少;相同土层深度,分形维数随着浑水含沙率和d_(0.01)的增加而增大。In order to explore the influence of sediment on soil structure under the condition of muddy water irrigation,four typical sediment particle gradations(which were quantified by the physical clay content with a particle size of less than 0.01 mm,d_(0.01):9.87%,20.48%,28.68%,37.39%)and two sand content rates(3%and 12%)were set up through the lab test of free infiltration of muddy water film hole irrigation.There were eight treatments in the experiment.The effects of muddy water characteristics on soil particle composition and fractal characteristics of film hole irrigation were studied.The result showed that the characteristics of muddy water had a greater impact on the soil particle composition of film hole irrigation.The relative content of fine particles in the deposition layer soil was lower than that of sediment in muddy water,which increased with the increase of sand content rate and d_(0.01) of muddy water.The soil particle composition of the stranded layer was opposite to that of the deposition layer,that is,the relative content of fine particles was higher than that of the original soil,which also increased with the increase of sand content rate and d_(0.01) of muddy water.The interaction of sand content rate and d_(0.01) of muddy water also had significant effects on the soil clay content and sand content at each depth of the stranded layer.The fractal dimension of soil particles in the stranded layer was greater than that of the original soil,and the difference between them was the largest in the layer of 0~2 cm.With the increase of infiltration depth,the increase of soil fractal dimension was less.At the same soil depth,the fractal dimension increased with the increase of sand content rate and d_(0.01) of muddy water.

关 键 词：浑水 膜孔灌入渗 含沙率 泥沙颗粒级配组成 

分 类 号：S275[农业科学—农业水土工程]