芦苇根-土复合体抗剪性能与水陆交错带土壤质地的关系  

Relationship between shear strength of Phragmites australis root-soil complexes and soil texture in aquatic-terrestrial ecotone

作　　者：镡雨欣 李林鑫 梁静 吴少阳 侯晓龙[1,2] 吴鹏飞 TAN Yuxin;LI Linxin;LIANG Jing;WU Shaoyang;HOU Xiaolong;WU Pengfei(College of Forestry,Fujian Agriculture and Forestry University,Fuzhou,Fujian 350002,China;Key Laboratory of State Forestry and Grassland Administration for Soil and Water Conservation in Red Soil Region of South China,Fuzhou,Fujian 350002,China;College of Soil and Water Conservation,Beijing Forestry University,Beijing 100083,China)

机构地区：[1]福建农林大学林学院,福建福州350002 [2]南方红壤区水土保持国家林业和草原局重点实验室,福建福州350002 [3]北京林业大学水土保持学院,北京100083

出　　处：《亚热带农业研究》2024年第2期127-134,共8页Subtropical Agriculture Research

基　　金：海峡两岸红壤区水土保持协同创新中心科研项目“水土流失监测与效益评价研究”(KP80ND80304);福建农林大学专业学位研究生课程教学案例库建设项目“国内外林木根系生物学体系案例库建设”(712018270478)。

摘　　要：[目的]了解湿地水陆交错带土壤质地对芦苇根—土复合体抗剪性能的影响及其相互之间的关系。[方法]以自然生长在闽江湿地水陆交错带不同质地土壤上的芦苇种群根系为研究对象,测定了芦苇根系的分布、形态及根—土复合体抗剪强度差异。结合土壤物理性质,采用灰色关联法与相关性分析对影响芦苇根—土复合体抗剪性能的因素进行分析。[结果](1)水陆交错带不同质地土壤物理性质差异明显,对芦苇根系的分布与形态产生了显著影响(P<0.05)。(2)水陆交错带不同质地土壤同一土层深度下,砂壤土与壤土黏聚力显著大于砂土(P<0.05),内摩擦角在不同质地土壤中差异不显著(P>0.05)。(3)通过灰色关联法分析发现,毛管孔隙度是影响芦苇根—土复合体黏聚力的最主要因素,灰色关联度为0.878;土壤含水量是影响芦苇根—土复合体内摩擦角的最主要因素,灰色关联度为0.921。(4)湿地水陆交错带砂壤土中芦苇根—土复合体抗剪性能最好,砂土中其抗剪性能最差。[结论]不同质地土壤中,芦苇根—土复合体抗剪性能差异明显。相较于砂土和壤土,密度小、含水量高和孔隙度大的砂壤土中芦苇根—土复合体抗剪性能最好。[Purpose]The aim of the study was to understand the effect of soil texture on the shear performance of Phragmites australis root-soil complexes and the relationship between them in the wetland aquatic-terrestrial ecotone.[Method]The root system of P.australis population naturally growing on different soil textures in wetland aquatic-terrestrial ecotone of Minjiang River was sampled to measure and analyze their distribution and morphology,and the differences in shear strength of root-soil complex.Combined with the physical properties of the soil,the grey correlation method and correlation analysis were used to analyze the factors affecting the shear performance of P.australis root-soil complex.[Result](1)The physical properties of different soil textures in the aquatic-terrestrial ecotone varied greatly,significantly affecting the distribution and morphology of P.australis roots(P<0.05).(2)Under the same soil depth of different soil textures in the aquatic-terrestrial ecotone,the cohesion force of sandy loam and loam soil was significantly greater than that of sandy soil(P<0.05),and the internal friction angles were not significantly different among different soil textures(P>0.05).(3)Through the grey correlation analysis,it was found that the main factor affecting the cohesion of P.australis root-soil complexes was soil porosity,and the grey correlation degree was 0.878.Soil water content was the most important factor affecting the internal friction angle,and the grey correlation degree was 0.921.(4)The shear strength of P.australis root-soil composite was the best in sandy loam soil while the worst in sandy soil of wetland aquatic-terrestrial ecotone.[Conclusion]In different soil texture,the variation in shear strength of P.australis root-soil composite is obvious.Compared with sand soil and loam soil,the sandy loam soil has the highest shear strength with low density and high water content and porosity.

关 键 词：芦苇 水陆交错带 根系抗剪强度 固土能力 土壤质地 

分 类 号：S157.9[农业科学—土壤学]