|国家科技期刊平台
首页|期刊导航|干旱区研究|黄河上游夏藏滩巨型滑坡区根-土复合体理化与强度特性

黄河上游夏藏滩巨型滑坡区根-土复合体理化与强度特性OA北大核心CSTPCD

The physicochemical and strength characteristics of root-soil composite system in the Xiazangtan super large scale landslide area of the upper Yellow River

中文摘要英文摘要

为研究黄河上游夏藏滩巨型滑坡分布区土体理化性质及力学强度特征,本研究通过在该滑坡体不同位置制取植物及土体试样,测定各采样点植物生长量指标、土体密度、含水率、含根量、抗剪强度指标以及营养元素含量等指标;在此基础上,通过采用Spearman相关性分析方法,探讨了该滑坡体不同位置植被类型、土体理化性质以及根-土复合体抗剪强度特征.结果表明:植物种类随海拔高度降低表现出增加趋势,其中优势草本植物为异针茅(Stipa aliena)、黄花棘豆(Oxytropis ochrocephala)、沙蒿(Artemisia desertorum)等3种;滑坡分布区土体pH值呈中性至碱性,有机质、全氮、全磷等3种营养元素含量在滑坡体后缘位置变化幅度相对较大,全钾、碱解氮等其余4种营养元素变化幅度较大但未表现出明显变化规律;土体含水率随海拔高度降低呈先增加后降低,土体密度呈增加的变化趋势,即随海拔降低增加幅度分别为7.05%和5.88%;根-土复合体粘聚力c值与含根量均表现出随海拔高度降低呈先增加后降低的变化趋势;此外,通过采用Spearman相关性分析得到,根-土复合体粘聚力c值与海拔高度之间呈负相关关系,而与含根量、有机质、含水率之间则呈正相关关系.研究结果对防治黄河上游龙羊峡至积石峡流域两岸边坡水土流失、浅层滑坡等地质灾害现象具有实际指导意义.

For this study of the physical and chemical properties and mechanical characteristics of soil in the dis-tribution area of Xiazangtan super large scale landslide of the upper Yellow River,plants and soil samples at dif-ferent positions of the landslide were collected,and the plant growth index,soil density,water content,root con-tent,shear strength index,and nutrient element content were measured.Spearman's correlation analysis was used to explore the vegetation types,physical and chemical properties of soil,and the shear strength characteristics of the root-soil composite system in different positions of the landslide.The number of plant species tended to in-crease as the altitude decreased,and the dominant herbaceous herbs were Stipa aliena,Oxytropis ochrocephala,and Artemisia desertorum.The pH of the soil in the distribution area of the landslide was neutral to alkaline.The contents of organic matter,total nitrogen,and total phosphorus change greatly at the trailing edge of the landslide,whereas the contents of total potassium,alkali-hydrolyzed nitrogen,and four other nutrients change greatly but do not show obvious variation.The water content of soil first increases and then decreases with the decrease in al-titude,while the density of soil increases as the altitude decreases,increasing by 7.05%and 5.88%,respectively.The cohesion c value and root content of the root-soil composite system first increased and then decreased as the altitude decreased.In addition,Spearman correlation analysis showed that the cohesion c value of the root-soil composite system was negatively correlated with altitude,but positively correlated with root content,organic mat-ter,and water content.The results of this study have practical significance for guiding the prevention and control of geological disasters such as soil erosion,and shallow landslide in the upper reaches of the Yellow River,from Longyang Gorge to Jishi Gorge.

樊秋璇;杨馥铖;付江涛;刘昌义;胡夏嵩;邢光延;赵吉美;张培豪

青海大学地质工程学院,青海 西宁 810016青海大学农林科学院,青海 西宁 810016青海大学农牧学院,青海 西宁 810016

黄河上游夏藏滩巨型滑坡土体理化性质根-土复合体抗剪强度

the upper Yellow RiverXiazangtan landslidethe physical and chemical properties of soilroot-soil composite systemshear strength

《干旱区研究》 2024 (005)

797-811 / 15

国家自然科学基金项目(42041006);第二次青藏高原综合科学考察研究项目(2019QZKK0905-14);青海省自然科学基金项目(2020-ZJ-906)

10.13866/j.azr.2024.05.08

评论