Study On The Effects Of Snow Melting Agents On The Main Tree Species In The Central Separation Zone Of Liaoning Expressway And The Countermeasures

When snow falls on highways in cold regions of the world in winter,chlorinated snow melts are mainly used for snow removal.Due to the heavy use of snow melting agents,soil salinization of the green zone on both sides of the central subzone and roads has resulted in persecution of plant growth.In order to solve the problem of poor growth and even death caused by salinization of plants in the mid-zonal zone,our current status of soil salinization in the mid-zone of Liaoning Province,the current status of plant salt tolerance,the improvement effect of different improvement measures,and Under the conditions of on-site and simulated tests,the effect of chloride salt snow-melting agent on the main tree species of elm and lilac in the central partition of the highway was studied.In this paper,three sample plots of Xinlu K26,Panhaiying K199,and Shenji K37 were selected by taking the soil in the middle zone of the highway as the research object,and the Na⁺and Cl^-in the soil were detected by the method of combining on-site and simulation tests,Mg²⁺,available phosphorus,available potassium,available nitrogen,p H value and soil conductivity and other index contents.Then,the chlorophyll fluorescence kinetic parameters and photosynthetic physiological characteristics of the improved lilac and elm trees were measured,and the improvement measures were finally proposed.Studies have shown that the p H,conductivity,Na⁺,Cl^-,Mg²⁺,and SO₄^2-contents of soils in the zoning zone of highways in Liaoning Province are generally higher than that of soils without chloride salt snowmelt.The contents of organic matter,available nitrogen,available potassium,and available phosphorus are unevenly distributed,and the content of available potassium as a whole is relatively high.Under salt stress conditions,the salt tolerance of elm is stronger than that of lilac.Taking all factors into consideration,the improvement measures have certain effects on reducing soil p H and electrical conductivity,and reducing Na⁺,Cl^-,and Mg²⁺ in the soil.Among them,the effect of burying the salt discharge pipe is the most significant,and the improvement effect is in order of salt discharge pipe>microbial modifier>Kangdibao>herbaceous plants.This article provides a reference for the research on the influence of snowmelt on the main tree species in the expressway separation zone.