不同濃度納米二氧化硅材料對(duì)黃土高原苜蓿與高羊茅根系形態(tài)的影響

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關(guān)鍵詞：納米二氧化硅；黃土高原；根系形態(tài)；生物量

中圖分類號(hào)：S154.2 文獻(xiàn)標(biāo)志碼：A 文章編號(hào)：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號(hào) 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！

黃土高原作為我國關(guān)鍵的生態(tài)屏障和重要的農(nóng)業(yè)生產(chǎn)基地，其土壤健康與植被恢復(fù)直接關(guān)系到區(qū)域生態(tài)安全與農(nóng)業(yè)可持續(xù)發(fā)展。（剩余8017字）