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

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关键词：纳米二氧化硅；黄土高原；根系形态；生物量

中图分类号：S154.2 文献标志码：A 文章编号：2097-2172（2025）08-0734-07

doi：10.3969/j.issn.2097-2172.2025.08.009

Effects of Different Concentrations of Nano-SiO2 on Root Morphology of Medicago sativa and Festuca arundinacea in theLoess Plateau

ZHUOMA Cao1， GOU Enze¹， KONG Ran’， LI Guang23 （1.CollgeofGeologyandJewelry，LanzhouResouesandEnvironmentVotechUniversityanhouGansu3Oina; 2.College of Forestry， Gansu Agricultural University，Lanzhou Gansu 73oo7O， China; 3.Hexi University， Zhangye Gansu 734ooo， China）

Abstract：Basedonthesoilremediationneeds intheecologicalbarrerzoneof theLoessPlateauthis studyinvestigatedthe responsemechanismofselectedtypicalherbaceousplantstonanoSiO，provdingatheoreticalbasisfortheapplicationofnaniC 2 （204号 insoilrestorationintheLoessPateau.Totypicalhrbaceousplantsalfalfa （Medicagosatia）andtallfscue （Festucaarundinacea） -were used as research subjects，a gradient addition experiment with nano-SiO -2 concentrations of O （CK）， 0.2% ， 0.8% ，and 2.0% was conductedtosystematicallyevealtheregulatoryeffectsofnanomaterialsonrootmorphologicaldevelopmentandbiomassRoot morphologicalanalysisandentropy-weightedcomprehensiveevaluationwereemployedtoquantifyresponsesofrootparameters underdifferenttreatments.ResultsshowedthattheO.8%concentrationsignificantlyenhancedgrowthinbothspecies.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 （2 86.6% gains in root number and volume. Conversely，the 2% treatment caused significant inhibition，reducing root morphological indicesandbomasscrosothspiesallueemonstatedgeaterssiivitytonentratonhangesitsovuiat 0.8% treatment exceeded alfalfa’s by 6O 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 analysisrevealedalfalfa'snhancedstressresistancetroughlateralrootredundancywhiletallfescue'sprimaryrootelongationwas moresusceptibletophsicalblockagebynanopaticles.Theentropy-weightedmodelconfirmedthatbothspeciesachievedteoetical maximum comprehensive scores （1.OO） under 0.8% treatment，validating that this concentration offers the optimal root improvement benefit.

Keywords：Nano- SiO2; Loess Plateau;Root morphology; Biomas！

黄土高原作为我国关键的生态屏障和重要的农业生产基地，其土壤健康与植被恢复直接关系到区域生态安全与农业可持续发展。（剩余8017字）