“杂交墨杉”新品种区域试验初报

A regional experiment of new cultivars of Taxodium mucronatum hybrid

以落羽杉、中山杉302和中山杉118为对照,对＂杂交墨杉＂新品种中山杉405、406、407和502在亭湖区和如东县进行区域造林试验,经过初步观测,4个新品种的株高、胸径和立木材积生长量均显著优于落羽杉。在2个试验点,中山杉502的表现均为最好,其中在亭湖区试验点中山杉407和118与502无显著差异,中山杉406与405的胸径和立木材积无显著差异;在如东县试验点中山杉406和407与502无显著差异,中山杉405的生长量略优于中山杉302但无显著差异。4个新品种的萌芽和展叶比落羽杉、中山杉302和118早2~5 d,顶稍叶片保留到第2年萌芽展叶后才脱落。落羽杉在2个试验地均出现黄化现象,而4个新品种因具有较强的耐盐能力没有黄化现象。4个新品种具有速生、耐盐、绿期长和观赏价值高等优点,在江苏省及周边地区的沿海防护林建设和盐碱地绿化造林,以及城乡绿化和农田林网等方面有很大的发展前景。

A regional experiment on Taxodium zhongshanshan 405、406、407 and 502 in Tinghu and Rudong area of Jiangsu province were conducted. T. distichum, T. zhongshanshan 302 and T. zhongshanshan 118 as the control in the experiment.The results showed that the plant height, diameter at breast height and volume of wood for four new cultivars are better than T. distichum significantly. T. zhongshanshan 502 is the best in every character among four cultivars in two experiment areas.In Tinghu test area, there are no significant variances among T. zhongshanshan 407, 118 and 502, and there are no significant variance between T. zhongshanshan 406 and 405 for the characters of diameter at breast height and volume of wood. In Rudong test area, there are no significant variances among T. zhongshanshan 406, 407 and 502 in every character.The growth of T. zhongshanshan 405 is higher than T. zhongshanshan 302, however, there are no significant variance.Germinating and leafing of four new cultivars were 2 ~5 days earlier than T. distichum, T. zhongshanshan 302 and 118, and the top leaves of new cultivars fell until the germinating and leafing in next year. No etiolation symptom appeared for four new cultivars in two experiment areas because their strong salt tolerance. Four new cultivars have the characters of growing fast, salt tolerance, long green period and high ornamental values, so it is valuable for coast protection foresting, saline land foresting and urban foresting.