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为探索林木速生丰产的捷径,丰富本地区植物资源,用培育新品种的方法需要较长的时间,因此,人们常用引种的方法来达到这一目的.一般选择经济价值大、抗逆性强、速生丰产、适应性广的外地优良树种,进行南北互相引种栽培,从中择其优者推广繁殖.南树北移,由于生长季节内的日照延长,使生长结束期推后,影响延迟封顶或者不封顶,而促进侧枝萌生,从而减少养分的积累,妨碍组织木质化,降低越冬能力,易产生冻害现象.北树南移,由长日照变为短日照,使树木提早封顶,缩短了生长期,抑制了树木的生长活动,因而产生封顶停长的现象.我们在北树南移的引种过程中,及十余年来用赤霉素促进林木速生丰产的试验中,发现用赤霉素可以打破北树南移封顶停长的现象.试验树种为中东杨(Populus berolinensis Dippel)由吉林省白城地区(北纬45°37′)引种插穗至长沙地区(北纬29°11′),纬度相差16°26′,距离相差1797公
In order to explore the shortcut of quick-growing forest yield, enrich the plant resources in the region and take a long time to cultivate new varieties, it is often used to introduce the method to achieve this goal.Generally choose the economic value, resilience, Fast-growing, wide adaptability of excellent trees in the field, the introduction of mutual cultivation of North and South, from the selection of its excellent promotion of breeding .South-tree northward shift due to the growth of the sunshine within the season to extend, so that the growth of the end of the delay, affecting the delayed capping or not Capped, and promote the pruning of collateral, thus reducing the accumulation of nutrients, hinder the organization of lignification, reduce the ability of winter, easy to produce frostbite phenomenon.North to south, from long sunshine into short sunshine, so that trees prematurely capsize, shorten the growth period, Inhibit the growth of trees, resulting in the cap to stop the phenomenon of we shift in the North South introduced during the shift, and more than ten years of gibberellin to promote fast-growing forest yield test, found that gibberellin can be broken The north tree was moved to the top of the south for a long time, and the test species was Populus berolinensis Dippel, which was introduced from the Baicheng area of Jilin Province (45 ° 37 ’N) to Changsha (latitude 29 ° 11’ ), A difference of latitude 16 ° 26 ’, a difference of 1797 kilometers