利用幼龄根用砧群抢救濒危古银杏研究

Saving dying old ginkgo trees by using a group of young root stocks

采用插皮嫁接技术，以多株栽植在待救古树基周的3年生实生银杏幼树（或部分古树根蘖）作为根涌砧，嫁接到濒危古银杏树体距离地面1～2m高处的韧皮部与形成层间，结果表明：古、幼银杏树的嫁接口能够愈合，实生苗根用砧的愈合率高于根蘖根用砧的愈合率；愈合成活率好的这两种根用砧银杏幼树根系能够替代被拯救古银杏树的死亡根系吸收养分和水分，从而使濒危古银杏树恢复生机。

Several 3-year-old ginkgo seedlings （or part of old ginkgo root suckers） planted around dying old ginkgo trees were used as rootstocks and grafted in the middle of phloem and cambium of dying old ginkgo trees at the height of 1～ 2 meters above ground. The results showed that the grafted young and old ginkgo trees could heal up and the healing percentage of seedlings was higher than that of root suckers. The roots of healing and surviving rootstocks could substitute for the dead roots of old ginkgo trees to absorb nutrients and water and so the dying old trees regain vigor.