文献类型：期刊文献

中文题名：4种植物生长旺盛期侧根分支处与相邻上级直根抗折特性的差异

英文题名：Difference of anti-fracture mechanical characteristics between lateral-root branches and adjacent upper straight roots of four plant species in vigorous growth period

作者：刘鹏飞[1] 刘静[1] 朱宏慧[1] 张欣[2] 张格[3] 李有芳[1] 苏禹[1] 王晨嘉[1]

第一作者：刘鹏飞

机构：[1]内蒙古农业大学生态环境学院;[2]水利部牧区水利科学研究所;[3]中国林业科学研究院沙漠林业实验中心

年份：2016

卷号：27

期号：1

起止页码：33-39

中文期刊名：应用生态学报

外文期刊名：Chinese Journal of Applied Ecology

收录：CSTPCD;;Scopus;北大核心:【北大核心2014】；CSCD:【CSCD2015_2016】；PubMed;

基金：国家自然科学基金项目(51364034)资助~~

语种：中文

中文关键词：侧根分支处;相邻上级直根;抗折特性

外文关键词：lateral root branch; adjacent upper straight root; anti-fracture characteristics;

分类号：S685.12

摘要：以3-4年生并处于生长旺盛期的柠条、沙柳、沙棘和白沙蒿为研究对象,采用自制夹具、TY8000伺服强力机,对有生命力的、根径为1-4 mm的侧根分支处及其相邻上级直根的抗折力进行测定,分析4种植物侧根分支处与相邻上级直根抗折力、抗折强度的差异.结果表明：尽管4种植物各径级侧根分支处平均根径大于相邻上级直根的平均根径,但侧根分支处的抗折力和抗折强度均小于相邻上级直根的抗折力和抗折强度;柠条、沙柳、沙棘和白沙蒿的侧根分支处抗折强度分别为相邻上级直根的71.5%、62.9%、45.4%、35.4%.4种植物侧根分支处、相邻上级直根的抗折力与根径呈显著的幂函数正相关,抗折强度与根径呈显著的幂函数负相关;4种植物侧根分支处、相邻上级直根抗折强度大小均为：柠条（33.66、47.06 MPa）〉沙柳（17.31、27.54 MPa）〉沙棘（3.97、8.75 MPa）〉白沙蒿（2.18、6.15 MPa）.
Taking four plant species,Caragana korshinskii,Salix psammophila,Hippophae rhamnides and Artemisia sphaerocephala,which were 3-4 years old and in vigorous growth period,as test materials,the anti-fracture forces of lateral-root branches and adjacent upper straight roots were measured with the self-made fixture and the instrument of TY 8000. The lateral-root branches were vital and the diameters were 1- 4 mm. The results showed that the anti-fracture force and antifracture strength of lateral-root branches were lesser than those of the adjacent upper straight roots even though the average diameter of lateral-root branches was greater. The ratios of anti-fracture strength of lateral-root branches to the adjacent upper straight roots were 71.5% for C. korshinskii,62.9% for S. psammophila,45.4% for H. rhamnides and 35.4% for A. sphaerocephala. For the four plants,the anti-fracture force positively correlated with the diameter in a power function,while the anti-fracture strength negatively correlated with diameter in a power function. The anti-fracture strengths of lateral-root branches and adjacent upper straight roots for the four species followed the sequence of C. korshinskii（ 33.66 and 47.06 MPa） 〉S. psammophila（ 17.31 and 27.54 MPa） 〉H.rhamnides（ 3.97 and 8.75 MPa） 〉A. sphaerphala（ 2.18 and 6.15 MPa）.