土壤2023，Vol.60Issue(5)：1129-1137,9.DOI:10.13758/j.cnki.tr.2023.05.024
永定河典型护岸植被土壤水分入渗特征及影响因素
Soil Water Infiltration and Influencing Factors of Typical Revetment Vegetation in Yongding River
摘要
Abstract
In order to study soil water infiltration under different revetment vegetation to provide references for regional riparian ecological restoration and water resources protection,three typical vegetation in the slope vegetation buffer zone of the Yongding River basin,including Willow,Vitex and Setaria were selected,dye morphology were studied by combining bright blue staining method with the software of Photoshop,Image Pro6.0.The development degree of priority flow was quantitatively evaluated based on fractal dimension and multi-index evaluation method,and the influences of different vegetation roots on priority flow was discussed.The results showed that water referential infiltration occurred in the soils under the three vegetation,the ratio of soil stained area(Dc)decreased gradually with the increase of soil depth,average Dc(38.32%)was the largest under Willow,which was 1.11 and 1.37 times of Vitex and Setaria,the length index and preferential flow fraction were significantly lower under Setaria than those of Willow(P<0.05),no significant difference was found in the depth of substrate flow under the three vegetation.The results of the priority flow evaluation index(PFI)and fractal dimension(FD)were consistent in the order of Willow>Vitex>Setaria,the wet front line fragmentation of Willow was the highest,and the priority flow phenomenon was the most obvious.Organic matter,non-capillary porosity and root length density significantly influenced water infiltration,the total root length density and non-capillary porosity were significantly positively correlated with Dc,FD was significantly positively correlated with roots≥1 mm and organic matter,and Dc was well fitted with root length density.In conclusion,under the same external conditions,Willow priority flow degree was greater,the diameter class and density of plant roots significantly influenced the development of preferential flow,and the more abundant roots≥1 mm,the more obvious the preferential flow phenomenon was,while the roots with diameter class<1 mm mainly promoted the uniform infiltration of surface soil water.关键词
优先流/多指标综合评价法/染色示踪/分形维数/根长密度Key words
Preferential flow/Multi-index evaluation method/Dyeing tracer/Fractal dimension/Root length density分类
农业科技引用本文复制引用
朱美菲,程金花..永定河典型护岸植被土壤水分入渗特征及影响因素[J].土壤,2023,60(5):1129-1137,9.基金项目
国家自然科学基金项目(U1703232)资助Supported by the National Natural Science Foundation of China(No.U1703232) （U1703232）
