Study on Growth Rules and Photosynthetic Physiology of Biennial Container Seedlings and Bare Root Seedlings of Phoebe

Transplantation experiment was carried out using biennial container seedlings and bare root seedlings of Phoebe zhennan S. Lee as materials. In the experiment,it measured the growth indicators such as the seedling height,basal diameter,and number of branches and leaves. Besides,it also measured net photosynthetic rate( Pn),transpiration rate( Tr),stomatal conductance( Gs),intercellular CO_2 concentration( Ci) and soluble sugar,soluble protein,malondialdehyde( MDA) content,superoxide dismutase activity and root activity. The results indicated that the growth indicators of the Phoebe container seedlings performed the best in the plant height,basal diameter,and number of branches and leaves; photosynthetic capacity was the strongest,and the fertilization could enhance the photosynthetic capacity of seedlings; soluble sugar,soluble protein content,superoxide dismutase activity and root activity of Phoebe container seedlings were higher than that of bare root seedlings.

利川市楠木群落特征研究

采用典型选样法,在湖北省利川市天然楠木群落设置了8个20 m×30 m的样地进行调查,记录样方内的物种及其株高、胸径、数量,对楠木种群内的物种组成、群落内植物属的区系分布特征、群落特征进行分析。结果表明,湖北利川楠木群落具有四大特点:1)物种组成丰富,共有维管束植物338种,隶属于117科261属,物种多样性较高;2)群落属稳定型群落,具备天然更新能力;3)楠木群落是以楠木为优势种群构成的单优群落;4)群落生境较适宜,群落资源十分珍稀。