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​女贞的深度驯化与应用

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​女贞的深度驯化与应用

发布日期:2015-05-13 00:00 来源:http://zgyiyuan.com 点击:

    女贞(ligustrum lucidum Ait)又经常被称做"大叶女贞",属木犀科。分布于我国长江流域及以南各省,在这些地区可自然长成20米左右高度和70厘米左右胸径的乔木。女贞喜温暖、不耐寒。在济南最早引种约在上世纪30年代,以后又陆续有引种,但只有种植在冬季温暖的小气候条件下,才能正常生长,而丛状生长的植株更耐寒。上世纪六、七十年代我市种植的女贞常有被冻死或冻毁大部分树冠、树干后翌年又重新荫生的情况,而后者常能诱发形成丛生状的树型,从而长期生存下来,矮化、丛生成了它对寒冷环境的一种适应方式。冬季的低温成为济南发展女贞的最大限制因子。虽然十余年来我国北方暖冬不断出现,女贞在我市发展、种植的数量也越来越多,但冻害仍然在灾害性天气(如气温突降、早霜)时频发。如我市东郊高新区采用单干小乔木型的女贞植为马路行道树,便经常出现冻害(本人认为女贞在济南不宜作行道树)。目前我市种植的女贞苗木均来自南方各省,从遗传学的观点看,它们的抗寒能力差,不适应济南秋冬的气候条件,对其大量应用不能不说是一种隐患。为改变此种状况,第一要实现从我市生存多年的大树上采集种子,并在就地苗圃中育苗,进行深度耐寒驯化,从而克服上述冻害的频发逐渐达到无冻害正常生长的目标;其次培育和应用丛生多干型的丛木苗,不仅可形成较大的树冠,而且也正因此而提高了抗寒能力(特别使树干免受冻害)和生态效益。


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相关标签:女贞

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