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黑沙蒿根系抗拉特性及其与化学成分的关联性
胡晶华1, 刘静1, 李雪松2, 白潞翼1, 张欣3, 王多民4
1.内蒙古农业大学 沙漠治理学院, 内蒙古 呼和浩特 010019;2.河北省水利科学研究院, 河北 石家庄 050051;3.水利部牧区水利科学研究所, 内蒙古 呼和浩特 010019;4.阿拉善盟气象局, 内蒙古 阿拉善盟 750300
摘要:
[目的] 探讨根系抗拉特性与主要化学成分含量的关联性,以期充实根系固土力学特性研究以及提供矿区生态恢复和植物保护的理论支持。[方法] 以神东矿区广泛分布的多年生灌木黑沙蒿(Artemisia ordosica)为研究对象,利用TY8000伺服式强力机,研究1~4 mm径级直根段、含侧根分支处根段抗拉材料的力学特性并测定各径级的纤维素、半纤维素和木质素,研究根系材料力学及其与化学成分的关联性。[结果] ①随着根系直径增加,黑沙蒿直根段、含侧根分支处根段抗拉力增加,而抗拉强度和杨氏模量减小,且抗拉力、抗拉强度和杨氏模量都与根系直径呈幂函数关系。②直根段、含侧根分支处根段化学成分含量差异显著(p<0.05),平均化学成分含量为:半纤维素(31.69%,32.18%) > 木质素(28.42%,25.30%) > 纤维素(15.50%,15.35%)。③随着根系直径增加,直根段纤维素含量减小,半纤维素和木质素含量增加,而含侧根分支处根段纤维素含量减小,半纤维素和木质素含量无变化。④直根段抗拉强度、杨氏模量与纤维素极显著正相关(p<0.01),与半纤维素、木质素极显著负相关(p<0.01)。含侧根分支处根段抗拉强度、杨氏模量与纤维素极显著正相关(p<0.01),与半纤维素、木质素无相关性。[结论] 黑沙蒿根系抗拉特性与化学成分表现出一定的相关性,且纤维素是影响灌木根系材料力学特性的主要化学组分。
关键词:  直根段  含侧根分支处根段  抗拉强度  杨氏模量  化学成分
DOI:10.13961/j.cnki.stbctb.20200821.001
分类号:Q947.6
基金项目:内蒙古自治区自然科学基金项目“几种灌木根系易损荷载类型、及承受可愈伤荷载时和自修复后的材料力学特性”(2018MS05004);内蒙古自治区研究生科研创新项目(B20171012907Z)
Relationship Between Root Tensile Properties and Its Responses to Their Chemical Contents of Artemisia Ordosica Species
Hu Jinghua1, Liu Jing1, Li Xuesong2, Bai Luyi1, Zhang Xin3, Wang Duomin4
1.College of Desert Control Science and Engineering, Inner Mongolia Agricultural University, Hohhot, Inner Mongolia 010019, China;2.Department of Water Resources of Hebei Proviece, Shijiazhuang, Hebei 050051, China;3.Institute of Water Resources for Pasturing Area of the Ministry of Water Resources, Hohhot, Inner Mongolia 010010, China;4.Alxa League Meteorological Bureau, Alxa, Inner Mongolia 750300, China
Abstract:
[Objective] The relationship between the root tensile properties and its responses to their chemical contents was discussed in order to enrich the mechanical properties of soil consolidation by root system and provide theoretical support for ecological restoration and plant protection in mining areas.[Methods] The tensile of straight roots and lateral roots of Artemisia ordosica in the Shendong coal mine area with diameters from 1~4 mm were measured with TY8000 servo power machine, and measure the contents of cellulose, hemicellulose and lignin of each diameter grade.[Results] ① The anti-tension force of straight roots and lateral roots of Artemisia ordosica were positively correlated with the diameter as a power function, the anti-tension strengths and Young modulus were negatively correlated with root diameter as a power function. ② The contents of cellulose hemicellulose and lignin of straight roots and lateral roots present a significant difference,the average chemical content is:hemicellulose (31.69%,32.18%) > lignin (28.42%,25.30%) > cellulose (15.50%,15.35%). ③ The contents of cellulose of straight roots were negatively correlated with the diameter,the hemicellulose content and lignin content of straight roots were positively correlated with the diameter, the contents of cellulose of lateral roots were negatively correlated with the diameter, the hemicellulose content and lignin content was unchanged with the diameter. ④ The anti-tension strengths and Young modulus of straight roots present a positively correlated with the contents of cellulose (p<0.01), but present a negatively correlation with hemicellulose content and lignin content (p<0.01). The anti-tension strengths and Young modulus of lateral roots present a positively correlated with the contents of cellulose (p<0.01), but not with hemicellulose content and lignin content.[Conclusion] The root tensile properties of Artemisia ordosica have a certain correlation with the chemical contents, the contents of cellulose is key factors affecting the mechanical properties of the root materials of shrubs.
Key words:  straight roots  lateral roots  tensile strength  Young modulus  chemical composition