Mechanical characteristics of herbaceous roots and soil anti-scourability on the slope of dump yards
ZHENG Jiangkun, ZHANG Ge, ZENG Qianting, ZHU Lin
College of Forestry, Sichuan Agricultural University, Sichuan Province Key Laboratory of Forestry Ecological Engineering in the Upper Reaches of Yangtze River, National Forestry and Grassland Administration Key Laboratory of Forest Resources Conservation and Ecological Safety on the Upper Reaches of the Yangtze River, 611130 Chengdu, China
Abstract：[Background] Many dump yards are formed during backfilling earthwork. The soils were loose and soil nutrient was deficient in dump yards. Vegetation are widely used to reinforceside slope of dump yards. At present, the researches on soil fixation of side slope were mainly concentrated on highway slopes and reservoir slopes. Few reports were concentrated on side slope of stone dump yards. [Methods] Compared with bare land of dump yards in Diexi town of Mao county, native herbs (Taraxacum mongolicum, Phragmites australis, Chenopodium album) and artificially planted herbs (Lolium perenne and Eleusine indica) were as the research objects.In order to screen out herbaceous plants with better performance in soil conservation and slope fixation,electronic universal testing machine, direct shear apparatus and soil anti-scourability experimental device were applied to measure the maximum tension resistance and tensile strength of single root, the shear strength of root-soil composite and soil anti-scourability index, respectively. [Results] 1)The tensile resistance of herb roots increased with the increase of root diameter, whereas the tensile strength decreased with the increase of root diameter. The average root tensile resistance of five herbs presented as C.album (12.42N)> T.mongolicum (11.52N)> P.australis (7.96N)> E.indica (4.36N)> L.perenne (3.36N), while the tensile strength showed an opposite trend as L.perenne(62.6MPa) ＞E.indica(43.8MPa)＞P.australis(43.7MPa)＞T.mongolicum(32.2MPa)＞C.album(27.2MPa). 2)The root-soil composite of L.perenne generally showed the highest shear strength, followed by E.indica, C.album, T.mongolicum, P.australis and bare land under 4 load conditions (level 50, 100, 150 and 200kPa). 3) Soil anti-scourability indexes of five herbs presented as L.perenne(3.09min/g)> C.album (2.93min/g)> E.indica (2.60min/g)> T.mongolicum (2.19min/g)> P.australis (1.52min/g)> Bare land (1.37min/g).[Conclusions] C.album showed maximum tension resistance of single root, and the L.perenne showed maximum anti-scourability and shear strength. Therefore, C.album and L.perenne should be considered invegetation restoration of dump yards in the barrier area of western Sichuan basin.
牛耀彬, 高照良, 齐星圆,等. 不同工程堆积体坡面治理措施对土壤抗冲刷侵蚀能力的影响[J]. 农业工程学报, 2019,35(2):134. NIU Yaobin, GAO Zhaoliang, QI Xingyuan, et al. Effect of different engineering accumulation slope treatment measures on soil erosion resistance[J]. Transactions of the CSAE, 2019,35(2):134.
[2]
ETTBED A E, RAHMAN Z A, WAN M, et al. Root tensile resistance of selected pennisetum species and shear strength of root-permeated soil[J]. Applied and Environmental Soil Science, 2020,45(3):1.
[3]
ZHANG Dashuai, DAI Yao, WANG Lingli et al. Influence of living and dead roots of Gansu poplar on water infiltration and distribution in soil[J]. Applied Sciences, 2020,10(10):3593.
[4]
ZHANG Baojun, ZHANG Guanghui, YANG Hanyue et al. Soil resistance to flowing water erosion of seven typical plant communities on steep gully slopes on the Loess Plateau of China[J]. Catena, 2019,17(3):375.
[5]
VERGANI C, GRAF F. Soil permeability, aggregate stability and root growth: A pot experiment from a soil bioengineering perspective[J]. Ecohydrology, 2016,9(5):830.
[6]
LEE Jungtai, CHU Mingyang, LIN Yusyuan, et al. Root traits and biomechanical properties of three tropical pioneer tree species for forest restoration in landslide areas[J]. Forests, 2020,11(2):179.
[7]
WANG Xia, HONG Miaomiao, HUANG Zheng et al. Biomechanical properties of plant root systems and their ability to stabilize slopes in geohazard-prone regions[J]. Soil and Tillage Research, 2019,18(9):148.
[8]
HUANG Bifei, QIU Ming, LIN Jinshi et al. Correlation between shear strength and soil physicochemical properties of different weathering profiles of the non-eroded and collapsing gully soils in southern China[J]. Journal of Soils and Sediments, 2019,19(11):3832.
[9]
段青松, 王金霞, 杨旸,等.金沙江干热河谷乡土草本植物根系提高土体抗剪强度及其模型预测[J]. 中国水土保持科学, 2017,15(4):87. DUAN Qingsong, WANG Jinxia, YANG Yang, et al.Improvement of soil shear strength by roots of native herbage plants in dry and hot valley of Jinsha River and its model prediction[J].Science of Soil and Water Conservation, 2017,15(4):87.
[10]
欧阳前超, 魏杨, 周霞,等. 土石山区护坡草本植物根系抗拉力学特性[J].中国水土保持科学, 2017,15(4):35. OUYANG Qianchao, WEI Yang, ZHOU Xia, et al. Tensile properties of roots of herbaceous plants for slope protection in rocky mountain area[J]. Science of Soil and Water Conservation, 2017,15(4):35.
[11]
吕猛, 吕刚, 翟景轩,等. 科尔沁沙地南缘不同林草措施土壤抗冲性及其与物理性质的关系[J]. 灌溉排水学报, 2019,38(S1):90. LÜ Meng, LÜ Gang, ZHAI Jingxuan, et al. The relationship between soil erosion resistance and physical properties of different forest and grass measures in the south margin of Horqin sandy land[J].Journal of Irrigation and Drainage, 2019,38(S1):90.
[12]
李平, 王冬梅, 丁聪,等. 黄土高寒区典型植被类型土壤入渗特征及其影响因素[J]. 生态学报, 2020,40(5):1610. LI Ping, WANG Dongmei, DING Cong, et al.Soil infiltration characteristics and influencing factors of typical vegetation types in Loess Plateau and cold region[J]. Acta Ecologica Sinica. 2020,40(5):1610.
[13]
邓珊珊, 夏军强, 宗全利,等. 下荆江典型河段芦苇根系特性及其对二元结构河岸稳定的影响[J]. 泥沙研究, 2020,45(5):13. DENG Shanshan, XIA Junqiang, ZONG Quanli, et al. Characteristics of reed root system and its influence on the river bank stability in the typical reach of the Lower Jingjiang River[J].Sediment Research, 2020,45(5):13.
[14]
周萍, 文安邦, 严冬春,等. 三峡库区紫色土坡耕地草本植物根系固结地埂的土力学机制[J]. 水土保持学报, 2017,31(1):85. ZHOU Ping, WEN Anbang, YAN Dongchun, et al. Soil mechanics mechanism of root consolidation of grass roots in purple slope cultivated land in Three Gorges Reservoir area[J]. Journal of Soil and Water Conservation, 2017,31(1):85.
[15]
刘亚斌, 胡夏嵩, 余冬梅,等. 西宁盆地黄土区草本和灌木组合根系分布特征及其增强土体抗剪强度效应[J]. 工程地质学报, 2020,28(3):471. LIU Yabin, HU Xiasong, YU Dongmei, et al.The root distribution characteristics of herbaceous and shrub combination in loess area of Xining Basin and its effect on soil shear strength enhancement [J].Journal of Engineering Geology, 2020,28(3):471.
[16]
金晓, 陈丽华. 晋西黄土区不同植被类型土壤抗冲性及表层根系分布特征[J]. 水土保持学报, 2019,33(6):120. JIN Xiao, CHEN Lihua. Characteristics of soil erosion resistance and surface root distribution of different vegetation types in western Shanxi loess area[J]. Journal of Soil and Water Conservation, 2019,33(6):120.
[17]
潘天辉, 杜峰, 王月. 陕北黄土区护坡植物根系分布和抗剪增强分析[J]. 水土保持研究,2020,27(3):357. PAN Tianhui, DU Feng, WANG Yue. Analysis on root distribution and shear strength of slope revetment plants in Loess Plateau of northern Shaanxi province[J]. Research of Soiland Water Conservation, 2020,27(3):357.
[18]
谌芸, 何丙辉, 练彩霞,等. 三峡库区陡坡根-土复合体抗冲性能[J]. 生态学报, 2016,36(16):5173. CHEN Yun, HE Binghui, LIAN Caixia, et al. Impact resistance of rhizo-soil complex in steep slope of Three Gorges Reservoir area[J].Acta Ecologica Sinica, 2016,36(16):5173.
[19]
郑小敏, 陈斌, 唐广成. 四川叠溪地质公园地质遗迹特征及地学意义[J]. 四川地质学报, 2020,40(2):338. ZHENG Xiaomin, CHEN Bin, TANG Guangcheng. The characteristics of geological relics and their geological significance in Dexi Geoparks in Sichuan province[J].Acta Geologica Sichuan, 2020,40(2):338.
[20]
李焱秋, 戴全厚, 任青青,等. 喀斯特浅层裂隙土壤垂向渗透性及影响因素[J]. 水土保持学报,2020,34(3):150. LI Yanqiu, DAI Quanhou, REN Qingqing,et al. Vertical permeability and influencing factors of karst shallow fissured soil[J]. Journal of Soil and Water Conservation, 2020,34(3):150.
[21]
刘红岩, 周正朝, 王宁,等. 黄土区草被生长初期土壤抗冲性及其影响因素[J]. 中国水土保持科学, 2018,16(2):55. LIU Hongyan, ZHOU Zhengzhao, WANG Ning, et al. Soil erosion resistance and its influencing factors at the early stage of grass growth in loess areas[J]. Science of Soil and Water Conservation in China, 2018,16(2):55.
[22]
TEERAWATTANASUK C, MANEECHAROEN J, BERGADO D T,et al. Root strength measurements of vetiver and ruzigrasses[J]. Lowland Technology International, 2014,2(16):71.
[23]
GENET M, STOKES A, SALIN F, et al. The influence of cellulose content on tensile strength in tree roots[J]. Plant and Soil, 2005,278(1):1.
[24]
邓佳. 南方红壤区常见草本根土复合体生物力学抗蚀机理研究[D]. 武汉:华中农业大学, 2015:36. DENG Jia.Study on the biomechanical corrosion resistance mechanism of common herbaceous root-soil complex in red soil region of South China[D].Wuhan:Huazhong Agricultural University, 2015:36.
[25]
宗全利, 冯博, 蔡杭兵,等. 塔里木河流域河岸植被根系护坡的力学机制[J]. 岩石力学与工程学报, 2018,37(5):1290. ZONG Quanli, FENG Bo, CAI Hangbing, et al.Mechanical mechanism of riparian vegetation root slope protection in Tarim River Basin[J].Journal of Rock Mechanics and Engineering, 2018,37(5):1290.
[26]
LEUNG F T Y, YAN W M, HAU B C H et al. Root systems of native shrubs and trees in Hong Kong and their effects on enhancing slope stability[J]. Catena, 2015,125(6):102.
[27]
NOORASYIKIN M N, ZAINAB M. A tensile strength of Bermuda grass and vetiver grass in terms of root reinforcement ability toward soil slope stabilization[J]. IOP Conference Series: Materials Science and Engineering, 2016,136(5):120.
[28]
FAN Chiacheng, CHEN Yuwen. The effect of root architecture on the shearing resistance of root-permeated soils[J]. Ecological Engineering, 2010,36(6):813.
[29]
李超, 周正朝, 朱冰冰,等. 黄土丘陵区不同撂荒年限土壤入渗及抗冲性研究[J]. 水土保持学报, 2017,31(2):61. LI Chao, ZHOU Zhengzhao, ZHU Bingbing, et al.Study on soil infiltration and impact resistance in loess hilly area with different fallow years[J]. Journal of Soil and Water Conservation, 2017,31(2):61.
2022, Vol. 20 
