头道岗林场通过水曲柳的选优、育砧、嫁接、定植已经建立了水曲柳无性系种子园130亩。其建园的主要做法是:一、优树无性系的培育1、育砧:于七七年春,从其他林场调来二年生水曲柳苗木,经选择健康无病苗以20×20CM 的距离换床。2、采穗:自七七年以来先后多次搞三大硬阔优选工作,共选优树一百株。在此基础上,七八年四月下旬采接穗,接穗采自树冠的中上部,采后低温控制,以防萌动。3、嫁接;选用劈接法,按无性系不同 Hedonggang forest farm through the excellent selection of Ash, anvil, grafting, colonization has set up a manchurian clonal seed orchard 130 acres. The construction of the park’s main approach is: First, the cultivation of superior tree clones 1, Yu an anvil: In the spring of 2007, transferred from other farm biennial balsam trees, the choice of healthy and disease-free seedlings to 20 × 20CM distance bed. 2, earning: Since 1979, has repeatedly engaged in three major hard-wide preferred work, a total of 100 trees. On this basis, in mid-April or early April of 1987, spikes and scions were collected from the middle and upper part of the canopy. After harvesting, the seeds were cryogenically controlled to prevent sprouting. 3, grafting; use cleavage method, according to different clones