高原路側(cè)草地土壤重金屬空間分布特征及生態(tài)風(fēng)險評價

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中圖分類號 X53 文獻(xiàn)標(biāo)識碼A 文章編號 1007-7731（2025）16-0069-07

DOI號 10.16377/j.cnki.issn1007-7731.2025.16.016

AbstractTo explore the spatial distribution characteristics of heavy metals in grassland soil along the plateau highways，thesoilsamplesfromthetypical national highway grassand inthestudyarea were selectedastheresearch object.Thecontents of six heavy metals （Pb，Zn，Cu，Cd，Niand Cr）inthe soil were studied，andtheir spatial distribution characteristics and patterns were analyzedto evaluate the soil heavy metal polutionand potential ecological risks. The results showed that the Pb content in the surface soil （O-1O cm） increased with the increase of the distance fromthe road.At diferent distances，Niand Cr tended to accumulate inthelowerlayer，whilePb，Znand Cd tended to accumulate in the surface layer.The stability of Pb and Cu in soil along the highway was relatively poor，whichwas greatly affcted bytraffic activities，while the stabilityof Cd wasrelatively good.There was a highly significant positive correlation between Cu， Pb and Zn （P<0.01） ，and a significant positive correlation between Pb ，Cr and Cu （ P <0.05）. The heavy metals Pb，Cd，Ni，CrandCu in the surface soil of grassandalong the road all reached the pollutionlevel.The degree of heavy metal pollution inthegrassandsoil at differentdistances wasrelativelyhigh，andthepotential ecological riskof heavymetals inthesoil wasslightto moderate.As the economyand tourism are developingrapidly，the potentialecologicalriskofsoilheavy metalpolutionwillincrease with growing trafic volume.Therefore，the prevention and control of heavy metal pollution in grassand soil along the highway should be given due attention.

KeywordsNorthwest Sichuan Plateau; grassland; soil heavy metals;spatial distribution characteristics; ecological risk

1材料與方法

草地生態(tài)系統(tǒng)不僅是發(fā)展畜牧業(yè)的物質(zhì)基礎(chǔ)，而且在水源保護(hù)、水土保持和氣候調(diào)節(jié)等方面發(fā)揮著重要作用。（剩余8416字）