Article(id=1307086674366849469, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086317918122434, articleNumber=null, orderNo=null, doi=10.12401/j.nwg.2025162, pmid=null, cstr=null, oa=null, hot=null, price=null, onlineType=0, articleFormat=0, articleType=null, articleTypeStr=null, receivedDate=1759161600000, receivedDateStr=2025-09-30, revisedDate=1761580800000, revisedDateStr=2025-10-28, acceptedDate=1761580800000, acceptedDateStr=2025-10-28, onlineDate=1789563347665, onlineDateStr=2026-09-16, pubDate=1776614400000, pubDateStr=2026-04-20, doiRegisterDate=null, doiRegisterDateStr=null, onlineIssueDate=1789563347665, onlineIssueDateStr=2026-09-16, onlineJustAcceptDate=null, onlineJustAcceptDateStr=null, onlineFirstDate=null, onlineFirstDateStr=null, sourceXml=null, magXml=null, createTime=1789563347665, creator=13701087609, updateTime=1789563347665, updator=13701087609, issue=Issue{id=1307086317918122434, tenantId=1146029695717560320, journalId=1306274195778404443, year='2026', volume='59', issue='2', pageStart='1', pageEnd='328', issueExtLink='null', onlineDate='null', pubDate='1776614400000', pubDateStr='2026-04-20', beforeIssueId=null, nextIssueId=null, price=null, status=1, issueComplete=1, articleOrder=1, issueType=-1, specialIssue=null, createTime=1789563262680, creator='13701087609', updateTime=1789616239746, updator='13701087609', preIssue=null, nextIssue=null, articleTotal=null, ext={EN=IssueExt(id=1307308519917638393, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086317918122434, language=EN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=), CN=IssueExt(id=1307308519917638394, tenantId=1146029695717560320, journalId=1306274195778404443, issueId=1307086317918122434, language=CN, specialIssueTitle=, coverIllustrator=null, specialIssueEditor=, specialIssueAbout=)}, issueFiles=null, downloadFileDto=null}, startPage=119, endPage=127, ext={EN=ArticleExt(id=1307086674677227966, articleId=1307086674366849469, tenantId=1146029695717560320, journalId=1306274195778404443, language=EN, title=Shear Strength of
Amorpha Fruticosa Root-Loess Composite, columnId=null, journalTitle=Northwestern Geology, columnName=null, runingTitle=null, highlight=null, articleAbstract=
Shallow fine roots enhance soil shear strength and play a critical role in vegetated slope stability. While prior research focused on factors like soil type, moisture, root arrangement, and plant species, the relationship between root characteristics and root-soil composite strength remains underexplored. This study employs direct shear tests on saturated Amorpha fruticosa root-loess composites to systematically investigate the influence of root content, root length, and key parameters (root area index - RAI, root length density - RLD, root volume ratio - Rv) on shear strength. Results show: ①under low vertical loads, shear strength increases significantly with root content, but this effect weakens under higher loads; ② reinforcement primarily enhances cohesion, with minimal impact on internal friction angle; ③ for root length ≥2 cm, an optimal root content (1%-1.5%) maximizes cohesion; ④ shear strength correlates strongly positively with RAI and Rv, but weakly with root content, biomass, RLD, and specific root length, indicating dominance of root-soil interface friction under saturation. This work clarifies the mechanical mechanisms of root reinforcement in saturated loess, identifies a specific optimal root content, defines key root characteristic-strength relationships (RAI, Rv, average diameter), and provides a new theoretical basis for the comprehensive understanding of the mechanical effects of vegetation slope protection in loess areas and the scientific design of ecological slopes.
, authors=Dekun LIU
1, Yiyi YANG
1, Xiaopeng GUO
2, 3, Hui ZHAI
1, Ping LI
1, 4, *, authorsList=Dekun LIU, Yiyi YANG, Xiaopeng GUO, Hui ZHAI, Ping LI, authorCompany=null, correspAuthors=Ping LI, authorNote=null, correspAuthorsNote=null, copyrightStatement=Copyright © 2026 Northwestern Geology. All rights reserved., copyrightOwner=null, extLink=null, articleAbsUrl=null, sourceXml=null, magXml=null, pdfUrl=null, pdf=null, pdfFileSize=null, pdfExtLink=null, richHtmlUrl=null, mobilePdfUrl=null, reviewReport=null, pdfFirstPage=null, abstractGraph=null, abstractGraphContent=null, abstractVideo=null, citation=null, cebUrl=null, magXmlContent=null, mapNumber=null, fund=null), CN=ArticleExt(id=1307086678565347796, articleId=1307086674366849469, tenantId=1146029695717560320, journalId=1306274195778404443, language=CN, title=紫穗槐根系–黄土复合体抗剪强度试验研究, columnId=1307086318673097157, journalTitle=西北地质, columnName=西北地区环境岩土工程问题研究, runingTitle=null, highlight=null, articleAbstract=
植被的浅细根通过加筋作用显著提高土体抗剪强度,这种力学效应是植被护坡机理研究和护坡效果评价的重点。以往研究更多关注土体类型和含水率、布根方式、植物种类等因素对根系固土效应的影响,很少关注根系特征与根土复合体强度特性的联系。笔者以紫穗槐根系–黄土复合体为对象,基于直剪试验,系统研究了饱和状态下含根量、根长及关键根系特征参数(根表面积指数RAI、根长密度、根系体积比Rv等)对根土复合体抗剪强度的影响规律与机制。结果表明:①低竖向荷载下,饱和含根土体抗剪强度随含根量增加而显著提升,但此效应随荷载的增大而减弱;②根系加固作用主要通过显著提高粘聚力实现,内摩擦角则无明显变化规律;③当根长≥2 cm时,存在一个“最优含根量”(1%~1.5%)使粘聚力达到最大值;④饱和根土复合体抗剪强度与根表面积指数(RAI)、根系体积比(Rv)呈显著正相关,而与含根量、根系生物量、根长密度、比根长相关性较弱。这表明在饱和条件下,根系对土体的增强主要依赖于根–土界面的摩擦作用。本研究明确了根系对饱和黄土应力应变关系及抗剪强度的影响及力学机制,确定了特定根长条件下的“最优含根量”,揭示了根系特征参数(RAI、Rv、平均根径等)与根土复合体抗剪强度的关系,能为黄土区植被护坡力学效应的全面理解和生态边坡的科学设计提供新的理论依据。
, authors=刘德锟
1, 杨伊怡
1, 郭小鹏
2, 3, 翟辉
1, 李萍
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1, address=
1Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1307086679567786469, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, authorId=1307086679387431394, language=CN, stringName=刘德锟, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北大学地质学系, 陕西 西安 710069, bio={"content":"
刘德锟(2002−),男,硕士研究生,主要从事黄土力学与生态岩土方面的研究工作。E−mail:791065865@qq.com
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刘德锟(2002−),男,硕士研究生,主要从事黄土力学与生态岩土方面的研究工作。E−mail:791065865@qq.com
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2, 3, address=
2Xi'an Center of China Geological Survey, Xi'an 710119, Shaanxi, China
3Key Laboratory of Loess Geological Hazards, Ministry of Natural Resources, Xi'an 710119, Shaanxi, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1307086680134017520, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, authorId=1307086679924302316, language=CN, stringName=郭小鹏, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
2, 3, address=
2中国地质调查局西安地质调查中心,陕西 西安 710119
3自然资源部黄土地质灾害重点实验室,陕西 西安 710119, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1307086678972195288, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, xref=2, ext=[AuthorCompanyExt(id=1307086678980583897, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086678972195288, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1307086680381481461, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, authorId=1307086680209514994, language=CN, stringName=翟辉, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北大学地质学系, 陕西 西安 710069, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null)}, companyList=[AuthorCompany(id=1307086678875726293, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, xref=1, ext=[AuthorCompanyExt(id=1307086678888309206, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086678875726293, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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1, 4, *, address=
1Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China
4Northwest University, Joint Laboratory of Special Rock and Soil Dynamic Disasters and Control between China and Kyrgyzstan under the Belt and Road Initiative, Xi'an710069, Shaanxi, China, bio=null, bioImg=null, bioContent=null, aboutCorrespAuthor=null), CN=AuthorExt(id=1307086680712831483, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, authorId=1307086680557642231, language=CN, stringName=李萍, firstName=null, middleName=null, lastName=null, prefix=null, suffix=null, authorComment=null, nameInitials=null, affiliation=null, department=null, xref=
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1西北大学地质学系, 陕西 西安 710069
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4西北大学,中–吉特殊岩土动力灾害与防控“一带一路”联合实验室,陕西 西安 710069)])])], keywords=[Keyword(id=1307086680809300476, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, orderNo=1, keyword=root–soil composite), Keyword(id=1307086680977072637, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, orderNo=2, keyword=shear strength), Keyword(id=1307086681056764414, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, orderNo=3, keyword=
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1Department of Geology, Northwest University, Xi'an 710069, Shaanxi, China), AuthorCompanyExt(id=1307086678896697815, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086678875726293, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
1西北大学地质学系, 陕西 西安 710069)]), AuthorCompany(id=1307086678972195288, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, xref=2, ext=[AuthorCompanyExt(id=1307086678980583897, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086678972195288, language=EN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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3Key Laboratory of Loess Geological Hazards, Ministry of Natural Resources, Xi'an 710119, Shaanxi, China), AuthorCompanyExt(id=1307086679098024413, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086679081247195, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
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4Northwest University, Joint Laboratory of Special Rock and Soil Dynamic Disasters and Control between China and Kyrgyzstan under the Belt and Road Initiative, Xi'an710069, Shaanxi, China), AuthorCompanyExt(id=1307086679299351008, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, companyId=1307086679186104798, language=CN, country=null, province=null, city=null, postcode=null, companyName=null, departmentName=null, remark=
4西北大学,中–吉特殊岩土动力灾害与防控“一带一路”联合实验室,陕西 西安 710069)])], figs=[ArticleFig(id=1307086683237802502, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.1, caption=
Root system analysis processing and visualization, figureFileSmall=dhITgHcIFfxPT4Oq6lEY6g==, figureFileBig=axmTsxcYDNWTigxZvVY/uw==, tableContent=null), ArticleFig(id=1307086683300717063, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图1, caption=
根系分析处理可视化流程图, figureFileSmall=dhITgHcIFfxPT4Oq6lEY6g==, figureFileBig=axmTsxcYDNWTigxZvVY/uw==, tableContent=null), ArticleFig(id=1307086683598512648, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.2, caption=
Shear stress-shear displacement curves of root-soil samples, figureFileSmall=MJbOUZFjQHKyAGUGcht5Bw==, figureFileBig=UkHjL8QUsvvv2qua0PfD4Q==, tableContent=null), ArticleFig(id=1307086683661427209, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图2, caption=
根系土试样的剪应力–剪切位移曲线, figureFileSmall=MJbOUZFjQHKyAGUGcht5Bw==, figureFileBig=UkHjL8QUsvvv2qua0PfD4Q==, tableContent=null), ArticleFig(id=1307086683724341770, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.3, caption=
Shear strength and its indexes of root-soil composites, figureFileSmall=chUchr0f/y+NioTa3Bj8kg==, figureFileBig=plXO01uKiel1snC4qTRO9g==, tableContent=null), ArticleFig(id=1307086683787256331, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图3, caption=
根土复合体的抗剪强度及其指标, figureFileSmall=chUchr0f/y+NioTa3Bj8kg==, figureFileBig=plXO01uKiel1snC4qTRO9g==, tableContent=null), ArticleFig(id=1307086683904696844, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.4, caption=
Characteristic parameters of the root system, figureFileSmall=MGapaoEyNW8zqt9wTkztgA==, figureFileBig=FtXY1GMooUbwGaessG9ZWQ==, tableContent=null), ArticleFig(id=1307086683984388621, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图4, caption=
试样中根系的特征参数, figureFileSmall=MGapaoEyNW8zqt9wTkztgA==, figureFileBig=FtXY1GMooUbwGaessG9ZWQ==, tableContent=null), ArticleFig(id=1307086684038914574, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.5, caption=
Kendall correlation coefficient matrix of root parameters and soil shear strength, figureFileSmall=7GnYWmjOOT9MDcYf9EchUw==, figureFileBig=f3IqCNu0hTizN7/5buzetQ==, tableContent=null), ArticleFig(id=1307086684097634831, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图5, caption=
根系特征参数与土体抗剪强度的Kendall相关矩阵, figureFileSmall=7GnYWmjOOT9MDcYf9EchUw==, figureFileBig=f3IqCNu0hTizN7/5buzetQ==, tableContent=null), ArticleFig(id=1307086684177326608, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Fig.6, caption=
Relation of root parameters and the soil shear strength, figureFileSmall=sTqDF5b6PBDI2PnoV1yMEA==, figureFileBig=nmbiPrpdYL2LDvRSuQarlA==, tableContent=null), ArticleFig(id=1307086684332515857, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=图6, caption=
植被根系特征参数和土体抗剪强度增量的关系, figureFileSmall=sTqDF5b6PBDI2PnoV1yMEA==, figureFileBig=nmbiPrpdYL2LDvRSuQarlA==, tableContent=null), ArticleFig(id=1307086684408013330, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=EN, label=Tab.1, caption=
Physical properties of soil samples
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含水率 w(%) | 土粒相对密度 Gs | 天然密度 ρ(g/cm3) | 液限 WL(%) | 塑限 WP(%) | 塑性指数 IP | 颗粒组成(%) |
| 砂砾 | 粉粒 | 黏粒 | 分类 |
| 16.8 | 2.71 | 1.48 | 28.2 | 17.7 | 10.5 | 15.1 | 75.1 | 9.8 | 低液限黏土 |
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试样基本物理性质
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含水率 w(%) | 土粒相对密度 Gs | 天然密度 ρ(g/cm3) | 液限 WL(%) | 塑限 WP(%) | 塑性指数 IP | 颗粒组成(%) |
| 砂砾 | 粉粒 | 黏粒 | 分类 |
| 16.8 | 2.71 | 1.48 | 28.2 | 17.7 | 10.5 | 15.1 | 75.1 | 9.8 | 低液限黏土 |
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Methods for determining root characteristic parameters
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| 特征参数 | 符号 | 单位 | 测量方法 |
| 根长 | li | mm | |
| 根径 | di | mm | |
| 湿重 | mw | g | 电子天平称量 |
根系生物量 (根系干重) | md | g | 60 ℃下烘干,电子天平称量 |
根系体积比 (单位体积的 根系总体积) | Rv | mm3/mm3 | $ {R}_{\text{v}}\text{=}\dfrac{{\displaystyle\sum _{\text{i}\text{=1}}^{\text{n}}}\dfrac{\text{π}{{\text{d}}_{\text{i}}}^{\text{2}}}{\text{4}}}{\dfrac{\text{π}{D}^{\text{2}}}{\text{4}}\text{h}}{l}_{\text{i}} $ |
根长密度 (单位体积的 总根长) | RLD | mm/mm3 | $ \text{RLD=}\dfrac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}{\text{l}}_{\text{i}}}{\dfrac{\text{π}{\text{D}}^{\text{2}}}{\text{4}}\text{h}} $ |
比根长 (总根长/ 根系生物量) | SRL | mm/g | $ \text{SRL}\text{=}\dfrac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}{\text{l}}_{\text{i}}}{{\text{m}}_{\text{d}}} $ |
根表面积指数 (单位面积的 根系总表 面积) | RAI | mm2/mm2 | $ \text{RAI}\text{=}\frac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}\text{π}{\text{d}}_{\text{i}}{\text{l}}_{\text{i}}}{\dfrac{\text{π}{\text{D}}^{\text{2}}}{\text{4}}} $ |
), ArticleFig(id=1307086684831638037, tenantId=1146029695717560320, journalId=1306274195778404443, articleId=1307086674366849469, language=CN, label=表2, caption=
根系特征参数确定方法
, figureFileSmall=null, figureFileBig=null, tableContent=
| 特征参数 | 符号 | 单位 | 测量方法 |
| 根长 | li | mm | |
| 根径 | di | mm | |
| 湿重 | mw | g | 电子天平称量 |
根系生物量 (根系干重) | md | g | 60 ℃下烘干,电子天平称量 |
根系体积比 (单位体积的 根系总体积) | Rv | mm3/mm3 | $ {R}_{\text{v}}\text{=}\dfrac{{\displaystyle\sum _{\text{i}\text{=1}}^{\text{n}}}\dfrac{\text{π}{{\text{d}}_{\text{i}}}^{\text{2}}}{\text{4}}}{\dfrac{\text{π}{D}^{\text{2}}}{\text{4}}\text{h}}{l}_{\text{i}} $ |
根长密度 (单位体积的 总根长) | RLD | mm/mm3 | $ \text{RLD=}\dfrac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}{\text{l}}_{\text{i}}}{\dfrac{\text{π}{\text{D}}^{\text{2}}}{\text{4}}\text{h}} $ |
比根长 (总根长/ 根系生物量) | SRL | mm/g | $ \text{SRL}\text{=}\dfrac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}{\text{l}}_{\text{i}}}{{\text{m}}_{\text{d}}} $ |
根表面积指数 (单位面积的 根系总表 面积) | RAI | mm2/mm2 | $ \text{RAI}\text{=}\frac{{\displaystyle\sum _{\text{i}\text{=}\text{1}}^{\text{n}}}\text{π}{\text{d}}_{\text{i}}{\text{l}}_{\text{i}}}{\dfrac{\text{π}{\text{D}}^{\text{2}}}{\text{4}}} $ |
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