Effects Of Fertilization And Shading On The Growth Of Sorbus Amabilis Seedlings

Sorbus amabilis was a beautiful plant, viewed leaf, flower and fruit, belonged tothe Maloideae of the Rose family Rosaceae, distributed in the wild. This paper studiedthe effects of shading intensity and fertilization on the growth and physiological of1year old seedling, in order to explore the light environment adaptation andfertilization management measures, provided scientific cultivation technical theory forSorbus amabilis, the main research results were asfollows:(1) Effects of shading on the growth, leaf anatomical structure and physiological ofSorbus amabilis seedlingsSignificant difference on morphological, anatomical and physiological of1-year-old Sorbus amabilis seedlings in respect to4shade levels (0%,67%,76%and92%)。The results showed that the shade treatments produced plants with greater height,leaf area, height-diameter ratio and specific leaf area, less stem diameter and mainroot length.Shading screens of67%and76%increased but92%decreased biomassaccumulation. All shading treatments altered biomass allocation patterns, led morephotosynthetic products transfer to up-ground parts, caused higher shoot to root ratiofor the increasing of stem and leaf mass ratio, and decreasing of root mass ratio.Leaf thickness, palisade parenchyma-spongy parenchyma ratio decreased, andconcentrations of chlorophyll increased in all the shading treatments compared withthe control. The curve of diurnal variation of leaf photosynthesis showed one peak,sun leaves had higher even net photosynthe rates and transpiration rates than theshade leaves.The results showed that shading stimulated the morphological and physiologicaladaptation mechanisms in seedling of Sorbus amabilis, moderate shading screen couldimprove plant quality during the(2) Effects of fertilization on the growth and physiology of Sorbus amabilis seedlingsPlant height, stem diameter, root length, total biomass of different fertilizationtreatments were higher than the control group, indicators significantly, the best ratioof fertilization of Sorbus amabilis seedlings was treatment5. The height effect ofSorbus amabilis seedlings was in order of N P K, stem diameter effect was in orderof N K P, root length effect was in order K N P.Fertilization enhanced photosynthesis, the fertilization ratio of maximum valuewith net photosynthetic rate, stomatal conductance, transpiration rate were treatment5.The net photosynthetic rate and intercellular CO₂concentration was negatively correlated, and with other photosynthetic parameters were significantly positivecorrelation.The content of chlorophyll a, chlorophyll b, chlorophyll a+b levels underfertilization were higher than the control, and significant difference.N concentration of leaves were the highest in organs of Sorbus amabilis, Nconcentrations were in order of leaf>root>stem, P concentrations were in order ofroot>stem>leaf,K concentrations were in order of leaf>root>stem. The fertilizationratio of N, P, K highest content was treatment5in different organs.In a word, The best ratio of fertilization on the growth of Sorbus amabilisseedlings was processing5, followed by the processing9, the processing7; the worsttreatments were three levels of N1(0.5g).