Effect of Nutritional Deficiency on the Growth of Phoebe bournei Seedling
IIn order to investigate the effects of nutritional elements on Phoebe bournei seedling growth and its physiology,one-year-old seedlings of P.bournei were cultured in sand with 7 treatments:complete nutrient application (control) and deficiencies of nitrogen (— N),phosphorus (—P),potassium (—K),calcium (—Ca),magnesium (—Mg),and sulfur (—S).Symptoms of the seedlings under different deficiency treatments were observed and their growth and photosynthetic fluorescence parameters were measured.Significant differences in leaf symptoms of —N,—N and —Mg seedlings were observed,such as yellow leaves,brown spots,chlorosis between the veins,different sizes of brown necrotic spots and so on.On the contrary,leaves of —Ca and —S seedlings showed no obvious symptoms.Seedling height,diameter,leaf area and biomass in —N,—K and —Mg treatments decreased significantly.Magnesium deficiency mostly affected the leaf area,and —K treatment had the greatest impact on leaf diameter and biomass.Photosynthetic electron transport rate (ETR) of elements showed a linear increase in deficiency-treated seedlings.Seedlings with —K treatment demonstrated the largest ETR.There existed the strongest positive correlation between ETR and PAR in —Ca treatment seedlings.Element deficiency had a certain influence on the seedlings.Maximum fluorescence yield value (Fm) in —Ca treatment seedlings was the largest but Y(Ⅱ)value was the least; The value of non-photochemical quenching (NPQ) in entire elements treatment seedlings were significantly lower than the others.Nitrogen deficiency treated seedlings had the least maximum photochemical quantum yield value (Fv/ Fm).
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