STUDY ON THE CUTTING PROPAGATION TECHNIQUE OF PICEA KORAIENSIS

The cutting propagation technique of Picea koraiensis was carried under automatic spraytng of total sunlight by adopting the same year epicormic branches from different trees with different age treated by different hormones in different concentration and time and the orthogonal and randomized block was designed. The results were as follows : (1)The rooting rate of the cutting reached at least 87 percent, when the cuttings were from the seed tree with the age below 25 years old and the cuts of the cuttings base were in vertical angle and on the fine sand medium. (2) The sequence of effective factors affecting the rooting rate were the style of cut, the age of seed tree and the trpe of mediun. (3) There are significant differences of rooting rate among different clones.

白桦嫩枝扦插繁殖技术的研究（Ⅰ）

通过白桦嫩枝扦插及移栽试验、对影响插穗生根的各种因素进行了研究，认为使用生根促进剂和枝条的幼化状态对生根率有显著影响。扦插苗的成活率在不同的移栽时间之间存在显著差异。用伐根的当年生半木质木萌条扦插生根效果最好，平均生根率在７０％以上。移栽成活率为６２．５％。

白桦嫩枝扦插繁殖技术的研究（Ⅱ）

在白桦（ＢｅｔｕｌａＰｌａｔｙｐｈｙｌｌａ）嫩枝扦插及移栽试验［１］的基础上．对其他影响生根及移栽成活率的各因素进行了研究，其结果：插条种类、扦插基质、无性系及生根促进剂均对生根率有显著影响、选用扦插成活苗上实生插条的生根率效果和抗腐烂效果最好；扦插苗的成活率受移栽时间、主根数量、扦插苗有无新叶长出等因素的影响。

长白落叶松扦插繁殖技术的研究

本文以长白落叶松扦插及扦插苗移栽试验为基础,对大量的影响因素进行了系统研究。确定了母树年龄、基质类型和树冠部位是扦插生根的主要影响因素。从幼树的树冠中部和上部采取嫩枝扦插在细河砂组成的基层上生根率最高。试验还表明长白落叶松的不同种源及同一小北湖种源的不同家系扦插生根率差异显著。长白落叶松扦插苗越冬后移栽成活率达到91.1％。

红皮云杉扦插繁殖技术的研究

在全光自控喷雾条件下,取不同树龄的当年生嫩枝,经各种激素不同浓度不同时间分别处理,采用正交及完全随机区组设计,进行红皮云杉的扦插试验。研究结果表明:①当插条采自25年生以下的母树,插条基部切口以直角切削,在细河砂组成的基质上扦插,其生根率最低可达87％;②对红皮云杉扦插生根有影响的因素大小依次为,切口方式>母树年龄>基质类型。激素的作用不大;③红皮云杉不同无性系扦插生根率差异显著。