This thesis deals with 6 clones ofAlnus cremastogyne .The
random complete block design (rcbd) is adopted in the test and the method of cuttage is involved in cultivating seedling .The main researches include : The variation law of PAL activity .soluble-protein content, peroxide activity, lignin content Jigningrowth, cellulose content .cellulose growth, night-growth, root-collar growth of the 6 clones during growing periodicity ;The variation degree among the 6 clones in PAL activity, ...