Effects of Different Substrate Treatments on Growths of Malania oleifera Seedlings
In order to improve quality of Malania oleifera seedlings and survival rates of afforestation,nine dif-ferent substrate treatments were designed with peat soils,light substrates,yellow soils,pine needles,vermicu-lite and perlite.Indexes of growth and biomass of M.oleifera seedlings were measured and correlations among indexes of growth and biomass and physico-chemical properties of substrates were analyzed.Different substrate treatments were comprehensively evaluated by principal component analysis.Results showed that growth index-es of M.oleifera seedlings were different among different substrate treatments.T5 treatment had the highest to-tal growths in seedling height and ground diameter,which were 69.39 cm and 8.31 mm respectively.T1 treat-ment had the highest total fresh weight of above-ground part(36.13 g),fresh weight of whole plant(69.97 g),to-tal dry weight of above-ground part(15.57 g)and dry weight of whole plant(25.94 g).T8 treatment had the high-est fresh weight of under-ground part and dry weight of under-ground part,which were 37.03 and 11.13 g re-spectively.Seedling height had significantly negative correlation with soil density,had significantly positive cor-relation with content of available phosphorus,and had extremely significantly positive correlations with contents of available nitrogen and available potassium.Ground diameter had significantly negative correlation with soil density,had significantly positive correlations with field capacity and total porosity,and had extremely signifi-cantly positive correlations with contents of available nitrogen and available potassium.Fresh weight of above-ground part,fresh weight of whole plant and dry weight of above-ground part had significantly positive correla-tions with total porosity.Fresh weight of whole plant had significantly positive correlation with content of avail-able nitrogen.Leaf biomass and whole plant biomass of seedlings in T1 treatment were the highest and compre-hensive score of principal component analysis was the best.Seedling height and ground diameter were the high-est in T5 treatment with lower leaf biomass than T1 treatment.Root growth in T8 treatment was the best,which was conducive to growths of under-ground parts of M.oleifera seedlings.T1,T5 and T8 treatments were suit-able for M.oleifera seedling cultivation.
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