华北护坡阔叶树种根系抗拉性能与其微观结构的关系

为了研究乔木单根抗拉性能与其微观结构和纤维的关系,为筛选合适的水土保持、边坡防护树种提供理论基础,对白桦、榆树、蒙古栎3种北方常见阔叶树种的根系进行了抗拉力、抗拉强度、根系解剖结构以及根系分子离析等一系列的试验,并运用多元回归的方法对两者之间的关系进行定量的分析.试验结果表明：3种阔叶树种的根系显微结构基本和其树材相同;根系显微结构中木纤维所占根系横截面积的百分比、韧皮部所占根系横截面积的百分比、木纤维的尺寸因素影响单根的抗拉特性;其中木纤维所占根系横截面积的百分比对单根抗拉力的影响因子最大且呈正相关,韧皮部所占根系横截面积的百分比对单根抗拉强度的影响因子最大且呈正相关;同时单根抗拉特性与木纤...

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Bibliographic Details
Published in农业工程学报 Vol. 29; no. 3; pp. 115 - 123
Main Author 蒋坤云 陈丽华 盖小刚 杨苑君
Format Journal Article
LanguageChinese
Published 北京林业大学水土保持学院,教育部水土保持与荒漠化防治重点实验室,北京 100083 2013
Subjects
微观结构
抗拉特性
水土保持
纤维
阔叶树种根系
抗拉特性
tensile properties
microstructure
fibers
微观结构
broadleaf Plant’s roots
阔叶树种根系
water conservation
纤维
水土保持
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ISSN1002-6819
DOI10.3969/j.issn.1002-6819.2013.03.016

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Summary:为了研究乔木单根抗拉性能与其微观结构和纤维的关系,为筛选合适的水土保持、边坡防护树种提供理论基础,对白桦、榆树、蒙古栎3种北方常见阔叶树种的根系进行了抗拉力、抗拉强度、根系解剖结构以及根系分子离析等一系列的试验,并运用多元回归的方法对两者之间的关系进行定量的分析.试验结果表明：3种阔叶树种的根系显微结构基本和其树材相同;根系显微结构中木纤维所占根系横截面积的百分比、韧皮部所占根系横截面积的百分比、木纤维的尺寸因素影响单根的抗拉特性;其中木纤维所占根系横截面积的百分比对单根抗拉力的影响因子最大且呈正相关,韧皮部所占根系横截面积的百分比对单根抗拉强度的影响因子最大且呈正相关;同时单根抗拉特性与木纤维的长度、木纤维的长宽比以及壁腔比均成正相关,但影响因子小于木纤维所占根系横截面积的百分比、韧皮部所占根系横截面积的百分比;3个树种中榆树在相同直径下的各项测定指标都高于白桦和蒙古栎,表现出单根具有更好的抗拉特性.研究结果可为固土护坡阔叶树种的选择提供参考.
Bibliography:11-2047/S
Forest vegetation is known to increase slope stability by reinforcing soil shear resistance, and root tensile properties are important factors to consider when choosing suitable species for reinforcing soil on an unstable slope. The macroscopic properties are determined by the microscopic structure; as a result, the microscopic structure of roots needs to be further observed to help us understand the relationship between the soil’s mechanical properties and the microstructure of roots. We chose three common broadleaf species （Betula platyphylla, Quercus mongolica, Ulmus pumila） in North China and carried out several experiments, including single-root tensile tests, root anatomical-structure tests, and wood-fiber segregation experiments. To analyze data from those experiments, we used multiple regression and analysis of variance （ANOVA） in order to determine the relationship between root tensile properties and selected anatomical structure. Results showed that in all species a significant power relati
ISSN:1002-6819
DOI:10.3969/j.issn.1002-6819.2013.03.016