摘要
分析漓江水陆交错带土壤粒径分形维数与水力性质,为漓江流域水陆交错带土壤迁移、沉积和土壤水文循环模拟提供参考依据。以漓江5个典型水陆交错带样地为研究对象,测定土壤基本物理性质和水力参数,计算土壤粒径分形维数,基于相关分析、冗余分析和逐步回归分析探讨分形维数与水力性质的关系。结果表明,漓江水陆交错带土壤粒径主要集中在0~400μm,土壤质地偏细,黏粒含量较高;土壤粒径分布范围中体积分数占比大的颗粒占主导地位,土壤粒径主要分布在密集区域,但粒径分布稀疏区的土壤颗粒对环境因子更敏感;单重分形维数(D)、信息维(D(1))、关联维(D(2))、信息维/容量维(D(1)/D(0))、谱宽(Δα)与饱和含水量、田间持水量、总孔隙度、VG模型和BC模型拟合的饱和含水量参数(VG-θs、BC-θs)呈显著负相关,与土壤容重呈显著正相关;D、D(1)、D(2)、D(1)/D(0)与土壤砂粒含量呈极显著负相关,与土壤颗粒比表面积、黏粒含量、粉粒含量呈极显著正相关;土壤基本物理性质可解释分形维数95.84%的变异,砂粒含量和总孔隙度是影响D值变化的主要因素,砂粒含量是影响D(1)、D(2)、D(1)/D(0)值变化的主要因素。漓江水陆交错带土壤粒径分布具有典型的分形特征,分形维数可以作为土壤水分运动数值模拟的指示性参数。
The aims of this work are to analyze the fractal dimension of soil particle size and soil hydraulic properties in the aquaticterrestrial ecotone of the Lijiang River and to provide references for the simulation of soil migration, deposition and soil hydrological cycle.Taking five typical aquatic-terrestrial ecotone plots in Lijiang River as the research object, the basic physical properties and hydraulic parameters of soil were measured, and the fractal dimensions of soil particle size were calculated. The relationships between the fractal dimensions and the hydraulic properties were discussed based on correlation analysis, redundancy analysis and stepwise regression analysis.The results showed that the soil particle size in the aquatic-terrestrial ecotone of the Lijiang River mainly ranged from 0~400 μm, with fine soil particles and high clay content. The soil particles with large volume fractions were dominant in the particle size distribution range. Soil particle size was mainly distributed in dense areas, but the soil particle size was more sensitive to environmental factors in sparse areas. The single fractal dimension(D), information dimension(D(1)), correlation dimension(D(2)), information dimension/volume dimension(D(1)/D(0))and spectral width(Δα) were significantly negatively correlated with the saturated water content, field capacity, total porosity, saturated water content fitted by the VG model and the BC model(VG-θs, BC-θs), while significantly positively correlated with the bulk density. D, D(1), D(2) and D(1)/D(0) were extremely significantly negatively correlated with the sand content, while extremely significantly positively correlated with the specific surface area of soil particles, clay content and silt content. The basic physical properties of soil can explain 95.84% variation of fractal dimension. Sand content and total porosity were the main controlling factors of D. Sand content was the main controlling factor of D(1), D(2) and D(1)/D(0). The distribution of soil particle size in the aquatic-terrestrial ecotone of the Lijiang River has typical fractal characteristics, and the fractal dimensions can be used as indicator parameters for numerical simulation of soil water movement.
作者
田卓
张帅普
代俊峰
毕明峰
何建华
TIAN Zhuo;ZHANG Shuai-pu;DAI Jun-feng;BI Ming-feng;HE Jian-hua(Guangxi Key Laboratory of Environmental Pollution Control Theory and Technology,Guilin University of Technology,Guilin 541004,Guangxi,China;Collaborative Innovation Center for Water Pollution Control and Water Safety in Karst Area,Guilin University of Technology,Guilin 541004,Guangxi,China)
出处
《节水灌溉》
北大核心
2022年第12期48-57,共10页
Water Saving Irrigation
基金
广西科技重大专项课题(桂科AA20161004)。
关键词
土壤粒径
多重分形
单重分形
水力性质
漓江水陆交错带
soil particle size
multifractal
single fractal
hydraulic properties
the aquatic-terrestrial ecotone of the Lijiang River
