33 endophyte strains(Frankia),from Alnus rubra(LH001～LH005),A.cremastogyne(SM001～SM010),A.trabeculosa (NL001～NL006,ZP1～ZP7) and Myrica rubra(ZY1～ZY5),were dealt with in this study,focusing on isolation and culture of endophytes and morphology of hypha,vesicle,and sporangia.

The photosynthetic properties of two-year-old seedlings of Alnus rubra were observed under natural conditions by means of Li-6400 Photosynthesis Analyzer to explore the influence of meteorological factors upon the seedlings′ photosynthesis.The results indicated that there was difference in diurnal variation of the net photosynthetic rate,i.e.,the curve of diurnal variation of the net photosynthetic rate determined on April 24th,October 10th and November 20th was characterized by single-peak,while the curve of diurnal variation of the net photosynthetic rate determined on Junuary11th and August 9th was characterized by double-peak.The diurnal variation of transpiration course of all the dates determined was one-peak curve.By means of correlation analysis and stepwise multi-regression analysis,the correlation between net photosynthetic rate and transpiration rate,the correlation between net photosynthetic rate and meteorological factors including quanta flux density,CO2 concentration,air temperature and the relative humidity of atmosphere was analyzed,and the regressive equations were formulated.

The results of cultivated experiment of Aluns rubra Bong.In the Nanjing region showed that the environment,such as sunlight,temperature and moisture was the key factors in the livability of seedlings.The growth of height of one-year old seedlings showed the curve of “S” and the rhythm of“slow-fast-slow”during the year.No obviously differences of the stem diameter closing to the ground of seedlings between the Jiangning site and the Liuhe site had been observed.Alunus rubra B.has the characteristics of rapid growth,extensive adaptability,and it could be a suitable tree species for popularizing and development.