摘要
应用盆栽控盐方法,通过模拟毛乌素沙地实际盐碱状况,研究不同质量浓度(0,150,300,450,600mg/L)植物延缓剂(以多效唑为例)对盐碱处理(全盐量0.94g/kg,处理时间3个月)下羊柴(Hedysarum laeve)根系形态特征的影响。结果表明:(1)盐碱胁迫会抑制羊柴根长的生长,降低根系与土壤结合面积及分支强度。其中,分叉数和交叉数所受的抑制作用最明显,分别较对照降低了77.54%,87.70%。(2)多效唑处理会促进羊柴根的生长,600mg/L多效唑处理后羊柴根长、根尖数、分叉数、交叉数、根表面积、根体积分别较单独施盐处理增加了87.66%,116.62%,136.11%,302.25%,57.50%,31.33%,说明多效唑可以缓解羊柴的盐害作用。(3)综合考虑6项根系形态指标,质量浓度为600mg/L的多效唑对提高羊柴耐盐性的效果最佳。
The pot experiment was conducted to study the effects of paclobutrazol with different concentra- tions（0 mg/L, 150 mg/L, 300 mg/L, 450 mg/L, 600 mg/L） on the root morphology of Hedysarurn laeve under the saline-alkali stress （0.94 g/kg total salt content） for three months. The results showed： （1） the root lengths were reduced, combined area between roots and soil and branching intensity were decreased under the saline-alkali stress. The forks and crossings were inhibited by 77.54% and 87.70%; （2） the application of paclobutrazol promoted the root growth, compared with single salt application, the root length, root tips, root forks, root crossings, root surface area and root volume increased by 87.66%, 116.62%, 136. 11%, 302.25%, 57.50%, 31.33%, respectively, under 600 mg/L paclobutrazol treatment, which revealed that paclobutrazol application could release the salt stress on Hedysarum laeve; （3） considered the above six root morphology indexes, the improving effect of 600 mg/L paclobutrazol on salt tolerance of Hedysarum laeve was the best.
出处
《水土保持研究》
CSCD
北大核心
2017年第4期187-190,共4页
Research of Soil and Water Conservation
基金
948项目"人工调控荒漠灌丛生态空间构型技术引进"(2015-4-22)
关键词
多效唑
盐碱胁迫
根系形态
羊柴
毛乌素沙地
paclobutrazol
saline-alkali stress
root morphology
Hedysarum laeve
Mu Us sandy land
