日本落叶松嫩枝扦插时间对生根的影响

为探讨扦插时间对日本落叶松嫩枝扦插生根的影响,在清原大孤家子和宽甸太平哨2个林场,于6月29日至7月31日采用9个时间段进行嫩枝扦插试验,结果表明:宽甸太平哨和清原大孤家子两个试验点均在7月15之前为嫩枝扦插的最佳时间,最迟不能晚于7月19日,扦插生根率7月15日比7月19日太平哨提高21.9%;大孤家子提高29%。扦插时间对生根量和最长根有一定的影响,但对偏根率影响不大。如果穗材生长达到适宜扦插长度,适当早插可提高生根率。

Influences of Time on Rooting of Tender Branch Cuttings for Larix Leptolepis

Experiments on tender branch cuttings in 9 time intervals were conducted from June 29th to July 31st in Qingyuan Dagujiazi Forestry Farm and Kuandian Taipingshao Forestry Farm in order to probe into the effects of time on rooting of tender branch cuttings for Larix leptolepis.The results indicated that:the time before July 15th at Qingyuan Dagujiazi and Kuandian Taipingshao testing sites was optimum for cuttings of tender branches,the latest time was no later than July 19th;the rates of rooting on July 15th increased by 21.9% at Taipingshao and 29.0% at Dagujiazi respectively compared with that on July 19th.Quantities of roots and the longest root were affected by time of cuttings to some extent but the rates of biased root were affected moderately.Time of tender branch cuttings should be earlier to improve the rates of rooting if cuttings reached the suitable length.