寒旱农业科学2025，Vol.4Issue(8)：734-740,7.DOI:10.3969/j.issn.2097-2172.2025.08.009
不同浓度纳米二氧化硅材料对黄土高原苜蓿与高羊茅根系形态的影响
Effects of Different Concentrations of Nano-SiO2 on Root Morphology of Medicago sativa and Festuca arundinacea in the Loess Plateau
摘要
Abstract
Based on the soil remediation needs in the ecological barrier zone of the Loess Plateau,this study investigated the response mechanism of selected typical herbaceous plants to nano-SiO2,providing a theoretical basis for the application of nano-SiO2 in soil restoration in the Loess Plateau.Two typical herbaceous plants-alfalfa(Medicago sativa)and tall fescue(Festuca arundinacea)-were used as research subjects,a gradient addition experiment with nano-SiO2 concentrations of 0(CK),0.2%,0.8%,and 2.0%was conducted to systematically reveal the regulatory effects of nanomaterials on root morphological development and biomass.Root morphological analysis and entropy-weighted comprehensive evaluation were employed to quantify responses of root parameters under different treatments.Results showed that the 0.8%concentration significantly enhanced growth in both species.Alfalfa exhibited 61.5%and 26.7%increases in total root length and root volume versus the control,while tall fescue showed 113.9%and 86.6%gains in root number and volume.Conversely,the 2%treatment caused significant inhibition,reducing root morphological indices and biomass across both species.Tall fescue demonstrated greater sensitivity to concentration changes,its root volume gain at 0.8%treatment exceeded alfalfa's by 60 percentage points,but its fresh weight reduction at 2%treatment(27.3%)was twice that of alfalfa(13.6%),and root diameter decreased by 28.2%in tall fescue,versus a milder reduction of 15.9%in alfalfa.Mechanistic analysis revealed alfalfa's enhanced stress resistance through lateral root redundancy,while tall fescue's primary root elongation was more susceptible to physical blockage by nanoparticles.The entropy-weighted model confirmed that both species achieved theoretical maximum comprehensive scores(1.00)under 0.8%treatment,validating that this concentration offers the optimal root improvement benefit.关键词
纳米二氧化硅/黄土高原/根系形态/生物量Key words
Nano-SiO2/Loess Plateau/Root morphology/Biomass分类
农业科技引用本文复制引用
卓玛草,苟恩泽,孔冉,李广..不同浓度纳米二氧化硅材料对黄土高原苜蓿与高羊茅根系形态的影响[J].寒旱农业科学,2025,4(8):734-740,7.基金项目
甘肃省科技计划自然科学基金项目(25JRRA75) （25JRRA75）
兰州资源环境职业技术大学校级科研项目(X2024A-06) （X2024A-06）
甘肃省高校教师创新基金项目(2025A-298). （2025A-298）
