干旱区生态环境知识资源中心(Arid): 不同损伤条件下沙柳直根力学特性的自修复差异

Arid

	不同损伤条件下沙柳直根力学特性的自修复差异
其他题名	Self-healing of mechanical properties of Salix cheilophila straight roots under different damage conditions
	王博 1; 刘静 1; 李有芳 1; 张欣 2; 李强 3; 刘嘉伟 1
来源期刊	生态学杂志
ISSN	1000-4890
出版年	2018
卷号	37 期号:12 页码:3549-3555
中文摘要	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77.1438.23 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15.222.85 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。
英文摘要	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 77.1438.23 N for roots with diameter of 1-4 mm. Tensile strength was negatively correlated with root diameter, with an average of 15.222.85 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 milddamage 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 selfhealing 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.
中文关键词	沙柳 ; 根系固土 ; 机械损伤 ; 抗拉力 ; 自修复
英文关键词	Salix cheilophila soil reinforcement mechanical damage tensile force self-healing
语种	中文
国家	中国
收录类别	CSCD
WOS类目	FORESTRY
WOS研究方向	Forestry
CSCD记录号	CSCD:6386244
来源机构	内蒙古农业大学
资源类型	期刊论文
条目标识符	http://119.78.100.177/qdio/handle/2XILL650/238209
作者单位	1.内蒙古农业大学沙漠治理学院, 呼和浩特, 内蒙古 010019, 中国; 2.水利部牧区水利科学研究所, 呼和浩特, 内蒙古 010019, 中国; 3.神东煤炭集团环保管理处, 伊金霍洛旗, 内蒙古 017200, 中国
推荐引用方式 GB/T 7714	王博,刘静,李有芳,等. 不同损伤条件下沙柳直根力学特性的自修复差异[J]. 内蒙古农业大学,2018,37(12):3549-3555.
APA	王博,刘静,李有芳,张欣,李强,&刘嘉伟.(2018).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,37(12),3549-3555.
MLA	王博,et al."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 37.12(2018):3549-3555.