Ecological adaptation of Syzygium hancei seedlings in Guangxi in different habitats
In order to understand the adaptation ability of Syzygium hancei seedlings to environmental factors in three different habitats under natural regeneration conditions,the current year's S.hancei seedlings were collected as experimental materials that regenerated in naturally coastal environments of Guangxi,and then antioxidant enzyme activities,soluble sugar(SS)content,malondialdehyde content and photosynthetic pigments in leaves and roots were measured.The results were as follows:(1)Variance analysis(ANOVA)was conducted on multiple environmental factors,which indicated that light intensitIES had highly significant differences,soil surface temperature and water content had not significant differences between the three sample plots.(2)Various light densities resulted in the changes of physiological characteristics of seedling leaves and roots in different habitats.With the light density increasing,superoxide dismutase(SOD)activity,SS content,MDA content,and chlorophyll a/b contents in leaves,and peroxidase(POD)activity in roots of seedlings were significantly higher in Habitat B than those in Habitat A;while POD activity,chlorophyll a,chlorophyll b and total chlorophyll contents in leaves,and SOD activity,SS and MDA contents in roots were higher in Habitat A than those in Habitat B.(3)With light intensity decreasing,seedlings that regenerated in Habitat B represented significantly higher SOD activity and MDA content in leaves,and POD activity in roots than those regenerated in Habitat A;however,these seedlings that regenerated in Habitat A represented significantly higher POD activity and SS content in leaves compared with those regenerated in Habitat B;chlorophyll a,chlorophyll b,total chlorophyll,and SS and MDA contents in roots were significantly higher in Habitat A than those in Habitat B firstly,and then changed to Habitat B being significantly higher than Habitat A;chlorophyll a/b content and SOD activity in roots were significantly higher in Habitat B than those in Habitat A firstly and then changed to Habitat A being significantly higher than Habitat B.Comprehensive analyses show that the physiological and biochemical characteristics of all the three habitats showing different adaptation abilities,in the meanwhile,photoinhibition occurrs in Habitat B with the lowest canopy density,hence,some manual adjusting practices are needed to create a moderate light environment,and to provide a suitable condition for promoting the natural regeneration of seedlings.
国家科技期刊平台
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