摘要
基于层次分析法筛选新疆伊犁地区乡土护坡植物,以伊犁地区乡土护坡植物为研究对象,针对加入保水剂的伊犁黄土开展持水特性试验和护坡植物栽培试验,考虑保水剂用量、种子埋深等因素,结合长期干旱情况下植物覆盖度、根系长度变化规律,研究长期干旱条件下保水剂对伊犁黄土护坡植物长势的影响。结果表明:(1)伊犁黄土的失水分为3个阶段,其中Ⅱ阶段为主要失水阶段;伊犁黄土的最佳保水剂质量分数为0.1%。(2)种植的乡土护坡植物中,豆科植物发芽最快,能实现边坡的快速复绿,相较于选取的豆科植物而言,禾本科植物表现出更强的耐旱性,植物根系可在短时间内达到加固浅层土体的效果;从长期干旱情况下看,土壤中加入适宜含量的保水剂,使得植被在干旱情况下的枯死速度和枯死量显著降低,能有效改善植被在干旱条件下的长势。(3)植物初期密度与种子埋深成反比,但在长期干旱情况下,植物密度小能有效延长植物存活时间,长期干旱情况下最佳种子埋深为5~8 cm;随着温度升高、相对湿度降低,土壤水分流失巨大,将导致植物死亡。研究结果可为长期干旱情况下的我国西北地区交通基础设施的生态修复提供一定参考。
This study carried out an exploration of the influence of a water-retaining agent on the growth of ecological restoration plants on road slopes in the Ili area,particularly under prolonged drought conditions.The selection of local slope protection plants in the Ili area was guided by the analytic hierarchy process(AHP).Experiments were conducted on the water retention characteristics of Ili loess when treated with a water-retaining agent,and the cultivation of local slope protection plants.Factors such as the quantity of the water-retaining agent and the depth at which seeds were buried were considered. Along with the variations in plant coverage and root length under extended drought conditions,the effect of water-retaining agent on the growth of plants were studied.The results show that the water loss of Ili loess is divided into three stayes,of which stage Ⅱ is the main wate loss stage.The water retention capacity of Ili loess could be significantly enhanced with a 0.1% dosage of the water-retaining agent.Among the planted slope protection vegetation,leguminous plants germinate the fastest,which can realize the rapid regreening slopes.Compared with the selected leguminous plants,grasses showed stronger drought tolerance,and the plant roots could achieve the effect of strenghthening shallow soil in a short time.The survival rate of plants could be improved under long-term drought conditions by adding a certain amount of water-retaining agent.Plant density is inversely proportional to seed burial depth,but in long-term drought conditions,small plant density can effectively prolong plant survival time with the optimal seed burial depth is 5~ 8 cm .As the temperature rises,the relative humidity decreases,and the soil loses moisture which will lead to the death of plants.The findings of this study could provide valuable insights for the ecological restorati.The findings of this study could provide valuable insights for the ecological restoration of traffic infrastructure in northwest China under long-term drought conditions.
作者
马周
杨贵侠
袁胜洋
马杰
李思环
刘先峰
MA Zhou;YANG Guixia;YUAN Shengyang;MA Jie;LI Sihuan;LIU Xianfeng(Ili Transportation Investment Group Co.,Ltd.,Ili 835000,China;School of Civil Engineering,Southwest Jiaotong University,Chengdu 610031,China;Key Laboratory of High Speed Railway Line Engineering Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China)
出处
《甘肃科学学报》
2025年第4期26-34,78,共10页
Journal of Gansu Sciences
基金
新疆交通运输厅2022年度交通运输行业科技项目(2022-ZD-018)
新疆交通设计院公司科研基金(KY2022042501)。
关键词
保水剂
伊犁地区
长期干旱
护坡植物
Water-retaining agent
Ili area
Long-term drought
Slope protection plants
