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[1]HUANG Guangjie,DUAN Qingsong,LI Jianxing,et al.Root Morphology and Tensile Characteristics of Five Kinds of Herbs in Reservoir Fluctuating Zone of Three Parallel Rivers[J].Research of Soil and Water Conservation,2022,29(03):389-395.

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Root Morphology and Tensile Characteristics of Five Kinds of Herbs in Reservoir Fluctuating Zone of Three Parallel Rivers

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 29 Number of periods: 2022 03 Page number: 389-395 Column: Public date: 2022-04-20

Title:: Root Morphology and Tensile Characteristics of Five Kinds of Herbs in Reservoir Fluctuating Zone of Three Parallel Rivers

Author(s):: HUANG Guangjie¹, DUAN Qingsong², LI Jianxing³, XIONG Shoude¹, LIU Wujiang¹, BAO Ruiqin¹, ZHANG Liyun⁴; (1.College of Resources and Environment, Yunnan Agricultural University, Kunming 650201, China; 2.College of Water Conservancy, Yunnan Agricultural University, Kunming 650201, China; 3.Power China Kunming Engineering Corporation Limited, Kunming 650051, China; 4.College of Mechanical and Electrical Engineering, Kunming 650201, China)

Keywords:: reservoir fluctuating zone; herbaceous plants: root morphology; tensile characteristics

CLC:: S781.25; S728.5

DOI:: -

Abstract:: In order to reveal the root morphology and tensile mechanical properties of five herbaceous plants in the reservoir fluctuating zone of the three parallel rivers, the dominant herbs of soil fixation and erosion resistance were selected. Arundo donax var. versicolor,Cyperus alternifolius L., Canna indica L., Acorus calamus L. and Phragmites communis Trin in the fluctuating zone of Huangdeng Reservoir on the Lancang River were selected as the samples in this study. The root morphology was analyzed and the root tensile property was measured by laboratory tests. The results show that:(1)the roots of the five herbs are well developed, and the root morphological indexes of the Arundo donax var. and the Cyperus alternifolius L. were in the top two, the roots of the two species are relatively developed; the root length, surface area and volume of the Five Herbs with diameter greater than 1 mm account for the largest proportion in their total roots, and the root volumes of the other four herbs with diameter greater than 2 mm account for the largest proportion, reaching 58.53% ～ 92.86%, except the Phragmites communis Trin;(2)the highest average tensile force and tensile strength of the five herbs is the Arundo donax var. versicolor(33.04 N, 34.33 MPa), and the lowest is the Canna indica L.(10.26 N, 7.54 MPa); with the increase of root diameter, the root tensile force and the root tensile strength of five herbs significantly increase, decrease; these relationships can both be well fitted by power function;(3)the maximum single root limit extensile rate of five herbs was the Acorus calamus L.(24.28%)and the lowest was the Arundo donax var. versicolor (8.20%), the maximum average Young's modulus is the Arundo donax var. versicolor(313.44 MPa), and the smallest is the Acorus calamus L.(70.47 MPa). There is a negative correlation between Young's modulus and root diameter. To sum up, the five herbaceous plants are well adapted to the environment of the study area, and can be used as candidate species for vegetation restoration of the fluctuating zone of the Huangdeng reservoir. The morphological indexes of the root system of the Arundo donax var. versicolor and the Cyperus alternifolius L. are significantly higher than those of the other three herbs, and the root system is relatively developed. The ability of the Arundo donax var. to resist the tensile action of the outer boundary is the strongest, and its soil fixation ability is the strongest, the results showed that the dominant herb for water and soil conservation in the fluctuating zone of the Huangdeng reservoir is the Arundo donax var. These results can be appropriately extended to the three parallel rivers area and other reservoir fluctuation zones.

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Last Update: 2022-04-20