三峡水库消落带狗牙根根系对紫色土抗剪性能的影响

doi:10.16843/j.sswc.2022079

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Abstract [Background] Plant roots play the most important role in improving soil erosion resistance. Affected by the fluctuation of water level, the root-soil composite in the water-level fluctuation zone of the Three Gorges Reservoir undergoes alternating cycles of dry and wet, and the effect of its roots on soil shear resistance is weakening. The purpose of this study is to explore the effect of roots on soil shear resistance in the water-level fluctuation zone of the Three Gorges Reservoir. [Methods] The water-level fluctuation zone of the Three Gorges Reservoir at an elevation of 165 m was selected as the study area, and the typical herb Cynodon dactylon and its root-soil composite were sampled during the period of vigorous vegetation. Direct shear tests and triaxial tests were conducted on undisturbed soil and remolded soil, and the internal friction angle and cohesion of soil were obtained. The effects of root morphological characteristics, root content and root layouts on soil shear resistance were discussed by regression analysis and principal component analysis. [Results] 1) The internal friction angle has a significant linear positive correlation with root length density, and increases logarithmically with the increase of root surface area density and root volume density. There is a significant logarithmic positive correlation between cohesion and root morphological characteristics. The influence degree of root morphology index on soil shear resistance is as follows: Root surface area density > root volume density > root length density > root weight density > root diameter. 2) Compared with rootless soil, the shear strength of root-soil composites with root contents of 0.9, 0.6 and 0.3 mg/cm³ increase by 14.54%-49.56%, 9.09%-35.82% and 3.80%-17.58%. The internal friction angle increases by 13.95%, 13.07% and 1.98%, respectively. The cohesion increases by 29.37%, 24.48% and 15.34%, respectively. 3) Compared with vertical and horizontal layouts, the shear strength of cross layout increases by 4.22%-16.95% and 11.45%-32.61% respectively. Cohesion increases by 15.61% and 16.09% respectively. The maximum stress values increases by 3.78%-34.18% and 36.86%-41.44% respectively. The effect of root layouts on cohesion is greater than that of internal friction angle. [Conclusions] To sum up, root morphological characteristics, root content and root layouts all have significant effects on the soil shear resistance of root-soil composite in the water-level fluctuation zone of the Three Gorges Reservoir. This study provides scientific reference for species screening, community construction, ecological construction of soil and water conservation, ecosystem reconstruction, and reservoir management in the water-level fluctuation zone of the Three Gorges Reservoir.

Key words： plant roots root-soil composite soil shear resistance water-level fluctuation zone Three Gorges Reservoir

Received: 26 April 2022

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S157.43

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	Articles by authors
	ZHENG Xiaolan
	BAO Yuhai
	HE Xiubin
	XIE Hangyu
	YU Yantong
	WANG Yingpei

Cite this article:

ZHENG Xiaolan,BAO Yuhai,HE Xiubin, et al. Effects of Cynodon dactylon root on the shear resistance of purple soil in the water-level fluctuation zone of the Three Gorges Reservoir[J]. SSWC, 2024, 22(4): 41-50.

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http://journal12.magtechjournal.com/Jweb_stbc/EN/10.16843/j.sswc.2022079 OR http://journal12.magtechjournal.com/Jweb_stbc/EN/Y2024/V22/I4/41

[1]	申春妮, 方祥位, 王和文, 等.吸力、含水率和干密度对重塑非饱和土抗剪强度影响研究 [J]. 岩土力学, 2009, 30(5): 1347. SHEN Chunni, FANG Xiangwei, WANG Hewen, et al. Research on effects of suction, water content and dry density on shear strength of remolded unsaturated soils [J]. Rock and Soil Mechanics, 2009, 30(5): 1347.
[2]	林嘉辉, 黄梦元, 张莉婷, 等.芒萁根系对崩岗红土层土壤抗剪强度的影响[J].水土保持学报, 2020, 34(6):159. LIN Jiahui, HUANG Mengyuan, ZHANG Liting, et al. Effect of Dicranopteris dichotoma roots on soil shear strength of red soil layer in benggang [J]. Journal of Soil and Water Conservation, 2020, 34(6): 159.
[3]	熊燕梅, 夏汉平, 李志安, 等.植物根系固坡抗蚀的效应与机理研究进展 [J]. 应用生态学报, 2007, 18(4): 895. XIONG Yanmei, XIA Hanping, LI Zhian, et al. Effects and mechanisms of plant roots on slope reinforcement and soil erosion resistance: A research review [J]. Chinese Journal of Applied Ecology, 2007, 18(4): 895.
[4]	占海歌.3种草本植物根系特征对土壤抗侵蚀性能影响 [D].武汉:华中农业大学, 2017:30. ZHAN Haige. Effects of root characteristics of three herbaceous plants on soil erodibility [D]. Wuhan:Huazhong Agricultural University, 2017:30.
[5]	李慧, 黄炎和, 蒋芳市, 等.2种草本植物根系对崩岗洪积扇土壤抗剪强度的影响 [J]. 水土保持学报, 2017, 31(3): 96. LI Hui, HUANG Yanhe, JIANG Fangshi, et al. Effects of two herbal plants' roots on soil shear strength in a collapsing gully alluvial fan [J]. Journal of Soil and Water Conservation, 2017, 31(3): 96.
[6]	李建兴, 何丙辉, 谌芸, 等.不同护坡草本植物的根系分布特征及其对土壤抗剪强度的影响 [J]. 农业工程学报, 2013, 29(10): 144. LI Jianxing, HE Binghui, CHEN Yun, et al. Root distribution features of typical herb plants for slope protection and their effects on soil shear strength [J]. Transactions of the CSAE, 2013, 29(10): 144.
[7]	贺秀斌, 鲍玉海.三峡水库消落带土壤侵蚀与生态重建研究进展 [J]. 中国水土保持科学, 2019, 17(4): 160. HE Xiubin, BAO Yuhai. Research advances on soil erosion and ecological restoration in the riparian zone of the Three Gorges Reservoir [J]. Science of Soil and Water Conservation, 2019, 17(4): 160.
[8]	吕发友, 鲍玉海, 贺秀斌, 等.三峡水库消落带淹水-落干交替下紫色土力学特性变化模拟 [J]. 水土保持学报, 2017, 31(3): 79. LÜ Fayou, BAO Yuhai, HE Xiubin, et al. Simulation of the changes in purple soil mechanical properties in response to alternate submergence and exposure in the riparian zone of the Three Gorges Reservoir [J]. Journal of Soil and Water Conservation, 2017, 31(3): 79.
[9]	张淑娟.三峡水库消落带土壤结构变化及抗剪强度的响应机理 [D]. 北京:中国科学院大学, 2020:101. ZHANG Shujuan. Soil structure changes and the response mechanism of soil shear strength in the water-level fluctuation zone of the Three Gorges Reservoir[D]. Beijing:University of Chinese Academy of Sciences, 2020:101.
[10]	李进林.三峡水库消落带泥沙沉积过程及其对水文节律的响应 [D]. 成都:中国科学院成都山地灾害与环境研究所, 2021:29. LI Jinlin. Sedimentation process in the water-level fluctuation zone of the Three Gorges Reservoir and its response to hydrologic regime [D]. Chengdu: Institute of Mountain Hazards and Environment, Chinese Academy of Sciences, 2021:29.
[11]	HE Xiubin, BAO Yuhai, NAN Hongwei, et al. Tillage pedogenesis of purple soils in southwestern China [J]. Journal of Mountain Science, 2009, 6: 205.
[12]	ZHANG Shujuan, TANG Qiang, BAO Yuhai, et al. Effects of seasonal water-level fluctuation on soil pore structure in the Three Gorges Reservoir, China [J]. Journal of Mountain Science, 2018, 15(10): 2192.
[13]	鲍玉海, 贺秀斌, 钟荣华, 等.三峡水库消落带植被重建途径及其固土护岸效应 [J]. 水土保持研究, 2014, 21(6): 171. BAO Yuhai, HE Xiubin, ZHONG Ronghua, et al. Revegetation and its effects on soil reinforcement in the riparian zone of Three-Gorge Reservoir [J]. Research of Soil and Water Conservation, 2014, 21(6): 171.
[14]	刘雷, 谭方玉.基于主成份分析的探地雷达信号去噪研究 [J]. 物探化探计算技术, 2019, 41(5): 674. LIU Lei, TAN Fangyu. Research on ground penetrating radar signal denoising based on principal component analysis [J]. Computing Techniques for Geophysical and Geochemical Exploration, 2019, 41(5): 674.
[15]	刘宇飞, 赵燚柯, 杨苑君, 等.2种草本植物混播根系对土体抗剪强度的影响 [J]. 中国水土保持科学, 2021, 19(3): 81. LIU Yufei, ZHAO Yike, YANG Yuanjun, et al. Effect of roots of two mixed sowing herbaceous plants on soil shear strength [J]. Science of Soil and Water Conservation, 2021, 19(3): 81.
[16]	沈晶玉, 周心澄, 张伟华, 等.祁连山南麓植物根系改善土壤抗冲性研究 [J]. 中国水土保持科学, 2004, 2(4): 87. SHEN Jingyu, ZHOU Xincheng, ZHANG Weihua, et al. Effects of plant root system on the anti-scourability of soil in the south of Qilian mountain [J]. Science of Soil and Water Conservation, 2004, 2(4): 87.
[17]	丁文斌, 何文健, 史东梅, 等.干湿作用对紫色土坡耕地生物埂土壤抗剪强度衰减-恢复效应[J]. 草业学报, 2017, 26(6): 56. DING Wenbin, HE Wenjian, SHI Dongmei, et al. Effect of drying-wetting condition on attenuation-recovery of soil shear strength of bio-embankment on sloping farmland comprising purple soil [J]. Acta Prataculturae Sinica, 2017, 26(6): 56.
[18]	谌芸, 祝亚军, 何丙辉.三峡库区狗牙根根系固坡抗蚀效应研究 [J]. 水土保持学报, 2010, 24(6): 42. CHEN Yun, ZHU Yajun, HE Binghui. Effect of root system of Bermuda grass (Cynodon dactylon (L.) Pers.) on slope reinforcement and soil erosion resistance in Three Gorges Reservoir region [J]. Journal of Soil and Water Conservation, 2010, 24(6): 42.
[19]	杨玉泉, 陈海生.山地水库消落带狗牙根耐淹性研究 [J]. 河南农业科学, 2013, 42(9): 66. YANG Yuquan, CHEN Haisheng. Research on submergence tolerance of Bermudagrass in water-level-fluctuation zone of mountain reservoir [J]. Journal of Henan Agricultural Sciences, 2013, 42(9): 66.
[20]	洪明, 郭泉水, 聂必红, 等.三峡库区消落带狗牙根种群对水陆生境变化的响应 [J]. 应用生态学报, 2011, 22(11): 2829. HONG Ming, GUO Quanshui, NIE Bihong, et al. Responses of Cynodon dactylon population in hydro-fluctuation belt of Three Gorges Reservoir area to flooding-drying habitat change [J]. Chinese Journal of Applied Ecology, 2011, 22(11): 2829.
[21]	李亚男, 刘国道, 罗丽娟.不同生境条件下的狗牙根形态变异研究 [J]. 热带作物学报, 2010, 31(9): 1502. LI Yanan, LIU Guodao, LUO Lijuan. Populational variation and ecological distribution of Cynodon dactylon[J]. Chinese Journal of Tropical Crops, 2010, 31(9): 1502.
[22]	徐少君, 曾波, 类淑桐.三峡库区几种耐水淹植物根系力学特征与土壤抗剪强度 [J]. 湖北农业科学, 2016, 55(18): 4664. XU Shaojun, ZENG Bo, LEI Shutong. Root mechanics and soil anti-shearing strength of several flooding-tolerant plants in Three Gorges Reservoir region [J]. Hubei Agricultural Sciences, 2016, 55(18): 4664.