新疆天山天池景区道路土壤磁学特征及其环境意义

Magnetic properties of road soil and its environmental implications in Tianshan Heaven Lake scenic spot of Xinjiang

为验证利用环境磁学方法监测旅游景区道路土壤污染的可行性,以新疆天山天池景区为研究区,采集不同道路土壤样品72件,并对其进行系统的磁学特征分析.结果表明:景区道路土壤样品磁性矿物含量适中,以亚铁磁性矿物(磁铁矿)为主,同时伴有少量不完全反铁磁性矿物;土壤磁性颗粒以多畴(MD)和稳定单畴(SSD)粗颗粒为主,且含有少量超顺磁性细颗粒(SP);从双因素方差分析结果看,不同位置道路土壤样品的磁性参数(χ_(LF)、SIRM、SOFT、χ_(FD)、SIRM/χ_(LF))和距离道路不同距离土壤样品的磁性参数(χ_(LF)、SIRM、SOFT、S_(-ratio))之间均存在显著性差异;景区旅游交通流量和距离道路远近、自然成土过程等人为和自然因素是影响景区道路土壤磁性特征变化的关键因素.

Magnetic properties of 72 road soil samples collected from Tianshan Heaven Lake in Xinjiang were systematically measured to verify the feasibility of applying the magnetic method in measuring road soil pollution in scenic spots. The results showed that the mineral magnetic concentrations of soil samples on scenic spot roads were intermediate, dominated by ferrimagnetic minerals （magnetite） and accompanied by a small amount of antiferromagnetic minerals. The main soil magnetic particles were coarse-grained multi-domain（MD） ,stable single domain（SSD） and a small amount of super paramagnetic particles （SP）. Meanwhile, there were significant differences in magnetic parameters （）（LF , SIRM, SOFT, Xro, SIRM/XLv ） of road soil samples in different positions and in different distances to road, as illustrated by two-way analysis of variance method. Tourist traffic, distance to road, and soil formation process were the key factors affecting the soil magnetic properties changes on scenic spot roads.