Salt Tolerance Mechanisms And Evaluation Of Five Vertical Greening Tree Species

Salt tolerance mechanisms of Celastrus orbiculata, Euonymusfortunei, Lonicera japonica, Parthenocissus tricuspidata, Parthenocissusquinquefolia have been systematically studied by physiological andbiochemical tests in order to find out inherent mechanisms of salt toleranceand to provide theoretics basis of new vertical greening approaches insalinized city . Twelve traits have been tested including the followings: saltendangerment, relative dry weight, net photosynthetic rate, stomatalconductance, intercellular CO2 , chlorophyll content, osmotic potential , Na+content , proline content ,membrane relative permeability, MDA ,SOD, andCAT. The salt endangerment degree is different among every tree species belowthe different salt stress treatment , The results of variance analysis indicatesthat the salt endangerment degrees are remarkable difference among treespecies , and the tree species is exceedingly remarkable difference with thedifferent salt stress treatment. The results of analysis indicates :The relative dry weight of tree specieshas difference, Parthenocissus tricuspidata > Lonicera japonica >Parthenocissus quinquefolia > Celastrus orbiculata > Euonymusfortunei, and The relative dry weight is extraordinarily susceptible to saltstress during the growth process, and the relative dry weight is a dependablecriterion that evaluate the salt stress degree and tolerance capability . The results of correlation analysis of salt stress and photosynthetic systemindicate: net photosynthetic rate, stomatal conductance, intercellular CO2 , andchlorophyll content are significant, non-stoma limit is dominant positionduring the entire salt stress process. The correlations of salt stress with proline content are significant. prolineis able to regulate the equilibrium of osmosize and protect enzymes in the 3聂晶:五个垂直绿化树种的耐盐机理及耐盐性评价cytoplasm against the electrolyte poison. During the process of salt stress , stability and the completeness ofmembrane system are damaged and the choice to the ions are lost, andpernicious ions greats quantity are absorbed . It is the main reason of the greatsquantity of plant that membrane system are seriously damaged in high saltstress treatment. SOD , CAT activity are deactivated , activity lost and damaged , whichcauses the membrane system instable , and the correlations of salt stress withSOD are significant , and the correlations of CAT are non-significant. Regression equations of tree species are found out with the stepwiseregression analysis, and evaluation accuracy of the regression equation exceed95 percent by means of the regression checkout in hypaethral land, and it isdependable and valid that of salt stress of tree species are evaluated bymeans of the regression equation. The primary component analysis indicates : The primary components ofCelastrus orbiculata are relative dry weight, net photosynthetic rate, MDA,proline; The primary components of Euonymus fortunei are relative dry weight,net photosynthetic rate, proline content ,membrane relative permeability; Theprimary components of Lonicera japonica are relative dry weight, MDA,chlorophyll content, proline content; The primary components ofParthenocissus tricuspidata are relative dry weight, chlorophyll content,proline content; The primary components of Parthenocissus quinquefoliaare dry weight, net photosynthetic rate, MDA, proline. 13 physiology biochenistry that have something to do with against everyspecies endure salt by means of adjusting and form target are ascertained bymeasuring , and utilize the fuzzifying mathematics membership function lawto endure the salt rating to five kinds of speciess , and the result of ratingmakes known that the 5 speciess >s endureing salt successively in theinterest of Boston ivy honeysuckle five of > humid euphorbia Nan Sheteng...