title: [Difference of anti-fracture mechanical characteristics between lateral-root branches and adjacent upper straight roots of four plant species in vigorous growth period].
abstract: 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 anti-fracture 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).
authors.forename: Peng-fei
authors.initials: PF
authors.lastname: Liu
authors.forename: Jing
authors.initials: J
authors.lastname: Liu
authors.forename: Hong-hui
authors.initials: HH
authors.lastname: Zhu
authors.forename: Xin
authors.initials: X
authors.lastname: Zhang
authors.forename: Ge
authors.initials: G
authors.lastname: Zhang
authors.forename: You-fang
authors.initials: YF
authors.lastname: Li
authors.forename: Yu
authors.initials: Y
authors.lastname: Su
authors.forename: Chen-jia
authors.initials: CJ
authors.lastname: Wang
mesh_terms: D019306:Artemisia / Q000254:growth & development*; D032602:Caragana / Q000254:growth & development*; D031281:Hippophae / Q000254:growth & development*; D018517:Plant Roots / Q000254:growth & development*; D032108:Salix / Q000254:growth & development*