不同损伤条件下沙柳直根力学特性的自修复差异

生态学杂志

不同损伤条件下沙柳直根力学特性的自修复差异

王博¹,刘静^1*,李有芳¹,张欣²,李强³,刘嘉伟¹

（¹内蒙古农业大学沙漠治理学院，呼和浩特 010019；²水利部牧区水利科学研究所，呼和浩特 010019；³神东煤炭集团环保管理处，内蒙古伊金霍洛旗 017200）

出版日期:2018-12-10 发布日期:2018-12-10

Self-healing of mechanical properties of Salix cheilophila straight roots under different damage conditions.

WANG Bo¹, LIU Jing^1*, LI You-fang¹, ZHANG Xin², LI Qiang³, LIU Jia-wei¹

(¹Desert Science and Engineering College, Inner Mongolia Agricultural University, Hohhot 010019, China; ²Institute of Water Resource for Pasturing Area of the Ministry of Water Resources, Hohhot 010019, China; ³Environmental Management Office of Shendong Coal Group, Ejin Horo Banner 017200, Inner Mongolia, China).

Online:2018-12-10 Published:2018-12-10

摘要/Abstract

摘要： 以干旱、半干旱区常用水土保持灌木沙柳1~4 mm径级直根为对象，利用HG100数显式推拉力计及自制便携试验机台，原位研究不同损伤程度和修复时长条件下直根力学特性的变化，以探讨外力机械损伤对根系力学特性自修复的影响。结果表明：（1）不同径级沙柳直根抗拉力和抗拉强度差异显著，抗拉力与根径呈显著幂函数正相关，1～4 mm根径平均抗拉力为77.14±38.23 N；抗拉强度与根径呈显著幂函数负相关，该径级内平均抗拉强度为15.22±2.85 MPa。（2）外力机械损伤显著抑制根系生长发育，受损程度不同产生的抑制作用不同，重度损伤对根系生长的阻碍更明显，相比对照，自修复3个月和5个月重度损伤根径生长量分别降低25.19%和29.96%，而轻度损伤分别降低18.67%和26.89%。（3）机械损伤对沙柳直根抗拉力和抗拉强度同样具有明显的削弱作用，但通过根系自修复可以逐渐消除损伤效应，自修复时间越长，力学特性修复率越高，自修复3个月和5个月抗拉力修复率分别为37.63%和48.13%。损伤程度也会对力学特性自修复产生影响，相同修复时长内根系受损程度越大力学特性修复率越低。

关键词: 无人机, 归一化植被指数, 植被覆盖度, 像元二分模型

Abstract: Salix cheilophila, a common shrub in arid and semi-arid areas, is usually used for vegetation restoration in Inner Mongolia. To clarify the effects of exogenous mechanical damage on self-healing of root mechanical properties, changes of mechanical properties of straight roots with diameter of 1-4 mm under different damage degrees and different recovery durations were examined in situ using the HG100 digital push and pull tester and self-developed experimental installation. The results showed that: (1) There were significant differences in tensile force and tensile strength among undamaged roots with different diameters. Tensile force was positively correlated with the diameter (power function), with average tensile force being 77.14±38.23 N for roots with diameter of 1-4 mm. Tensile strength was negatively correlated with root diameter, with an average of 15.22±2.85 MPa. (2) Exogenous mechanical damage could impede the regular growth and development of plant roots. Such inhibitory effects differed with the degree of damage to the roots. Severe damage had a stronger inhibitory effect on root diameter growth than mild damage. After self-healing for three and five months， comparing with control, the severe damage could decrease the growth rate of root diameter by 25.19% and 29.96% respectively, and the mild-damage for 18.76% and 26.89%. (3) Tensile force and tensile strength of roots were significantly decreased after mechanical damage, with such effects being gradually eliminated with the help of root selfhealing mechanism. The longer the root recovery time, the greater the recovery rate of mechanical properties. The average recovery rates of tensile force after self-healing for three and five months were 37.63% and 48.13% respectively. The degree of damage also affected the self-healing of mechanical properties. The recovery rates of mechanical properties for severe damage roots were significantly lower than those for mild-damage roots under the same recovery durations.

Key words: pixel binary model, fractional vegetation cover, unmanned aerial vehicle, normalized difference vegetation index

王博,刘静,李有芳,张欣,李强,刘嘉伟. 不同损伤条件下沙柳直根力学特性的自修复差异[J]. 生态学杂志.

WANG Bo, LIU Jing, LI You-fang, ZHANG Xin, LI Qiang, LIU Jia-wei. Self-healing of mechanical properties of Salix cheilophila straight roots under different damage conditions.[J]. cje.

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