| "Zhongshansha", an excellent crossbreeding clone of Taxodium Rich., was known for rapid growth, high resistance to salt and alkali soil and strong adaptability, and it could be used as a high-quality timber and defendant woods. The cutting of four excellent F2 generations,"Zhongshansha 24","Zhongshansha 118","Zhongshansha 136"and"Zhongshansha 160", were studied in this thesis, in order to provide theoretical gist for cutting of"Zhongshansha"clones. The results were as follows:1."Zhongshansha 118", with rooting rate of 42.2% in hardwood cutting and 79.2% in softwood cutting, showed better effect for cutting than"Zhongshansha 24","Zhongshansha 136"and"Zhongshansha 160"in both hardwood and softwood cutting experiments of different"Zhongshansha"clones.2. The hardwood cutting of"Zhongshansha"clones was difficult and the propagating times could affect the rooting rate significantly. The rooting rate, root number and root length of March 5 were higher than those of March 25.3. The softwood cutting was a better propagating method for"Zhongshansha"clones. The propagating times could affect the rooting rate significantly, the effect of cutting in June 28 was better than that any of latter three times. The results of cutting with different branch parts showed that the rooting rate of cuttings with under part of branch was highest, followed by that of middle part, and that of tip was lowest. The results of cutting with branch of different lengths showed that the effect of cuttings of 15cm was best followed by that of 8-10cm, and that of 5-6cm was worst. 4. The analysis of orthogonal experiment showed that the best combined treatment of hardwood cutting of"Zhongshansha"was that"Zhongshansha 118"was treated by ABT 200mg·L-1 for 30min and the best combined treatment of softwood cutting was that"Zhongshansha 118"was treated by IBA l000mg·L-1 for 10s.
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