向家坝工程扰动区不同生态修复模式边坡土壤颗粒分形特征  

Fractal Features of Soil Particles Under Different Ecological Remediation Modes of Xiangjiaba Project

作　　者：马悦阳 夏栋[1,3,4] 舒倩 郭士维 罗婷 闫书星 刘大翔 MA Yueyang;XIA Dong;SHU Qian;GUO Shiwei;LUO Ting;YAN Shuxing;LIU Daxiang(Hubei Provincial Engineering Research Center of Slope Habitat Construction Technique Using Cement-based Materials(China Three Gorges University),Yichang,Hubei 443002,China;College of Civil Engineering&Architecture,China Three Gorges University,Yichang,Hubei 443002,China;College of Hydraulic&Environmental Engineering,China Three Gorges University,Yichang,Hubei 443002,China;College of Biological&Pharmaceutical Sciences,China Three Gorges University,Yichang,Hubei 443002,China)

机构地区：[1]水泥基生态修复技术湖北省工程研究中心(三峡大学),湖北宜昌443002 [2]三峡大学土木与建筑学院,湖北宜昌443002 [3]三峡大学水利与环境学院,湖北宜昌443002 [4]三峡大学生物与制药学院,湖北宜昌443002

出　　处：《水土保持研究》2023年第4期83-89,共7页Research of Soil and Water Conservation

基　　金：国家自然科学基金项目(51979147);自然资源部城市自然资源监测与仿真重点实验室开放基金资助项目(KF-2019-04-071)。

摘　　要：[目的]研究不同生态修复后边坡土壤颗粒分形特征,为分形维数作为评价修复后向家坝工程扰动区边坡土壤质量的综合指标提供科学依据。[方法]以向家坝工程扰动区6种不同生态修复模式下的0—10 cm边坡土壤为研究对象,通过野外采样和室内试验,采用单重和多重分形理论相结合的方法,研究自然演替与人工修复模式下土壤粒径分布(PSD)和分形特征及土壤养分特征并分析了其相关关系。[结果]不同生态修复模式下土壤颗粒组成以粉粒和砂粒为主,黏粒含量较少,粒径分布不均匀。天然林地土壤养分含量相对较高且土壤颗粒较细。黏粒与D v呈极显著正相关(p<0.01),与土壤有机碳和速效氮呈显著正相关(p<0.05),粉粒含量与D_(1),D_(2)呈极显著负相关(p<0.01),砂粒与D_(1),D_(2)呈极显著正相关(p<0.01)。土壤养分与黏粒、粉粒含量呈不显著正相关,与砂粒含量,D_(1),D_(2)呈不显著负相关。[结论]向家坝工程扰动区土壤颗粒以粉粒和砂粒为主,土壤质地较粗,而植被混凝土修复技术有利于细颗粒的积累,从而提高土壤均匀度,可以作为生态修复的参考。粉粒和砂粒不仅主导多重分形参数,还对养分有促进作用,可用来作为研究区域生态修复效果的标度。[Objective]The fractal characteristics of soil particles in slope after different ecological restoration was studied to provide a scientific basis for the fractal dimension as a comprehensive index to evaluate the soil quality of slope in the disturbed area of XiangJiaba Project after restoration.[Methods]Soils in the depths of 0 to 10 cm in six different ecological remediation modes of the Xiangjiaba Project were used in this study.Monofractal and multifractal theory was used to measure and analyze soil particle size distribution(PSD),soil fractal features,soil nutrient contents and their correlations from natural succession and artificial restoration.[Results]Soil particle composition under different ecological remediation modes is dominated by silt and sand particles,with less clay particles and uneven particle size distribution.Clay content was highly significantly positively correlated with D V(p<0.01),significantly positively correlated with soil organic carbon and rapidy available nitrogen(p<0.05),silt content was highly significantly negatively correlated with D_(1)and D_(2)(p<0.01),and sand content was highly significantly positively correlatedn with D_(1)and D_(2)(p<0.01).Soil nutrients were positively and insignificantly correlated with contents of clay and silt and negatively insignificantly correlated with content of sand,D_(1)and D_(2).[Conclusion]The soil particles in the disturbed area of Xiangjiaba Project are mainly silt and sand,and the soil texture is coarse.The vegetation concrete restoration technology is conducive to the accumulation of fine particles,so as to improve the soil uniformity,which can be used as a reference for ecological restoration.Silt and sand not only dominate the multifractal parameters,but also promote the nutrient,which can be used as the scale of ecological restoration effect in the study area.

关 键 词：土壤粒径分布 分形维数 土壤养分 生态修复 

分 类 号：S152.3[农业科学—土壤学]