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嘉定有一片“魔法森林”

2018-06-19 15:26:58 来源: 嘉定报
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  不是高大的梧桐,也不是樟树和榉树,在环城河绿化带内,一批来自国外的栎树和槭树等彩叶品种,将为原本树种单一的环城河绿化带注入新的色彩。

  什么是彩叶树?简单来说,就是会变色的树。在上海世博会期间,嘉定区曾在新成公园种植彩叶树。每到深秋,随着气温的变化,树叶的颜色也跟着变化,形成独特的风景。

  此外,在徐行镇小庙村还有一个鲜为人知的彩叶树育种基地。前不久,记者走进小庙村一个不大的院子里,这个区林业站的育种基地内,种了84个品种的彩叶树,其中以栎树和槭树品种居多。枫叶只会变红?其实不然。育种基地种植的北美枫香在由绿变红的过程中,会保持一段时间的紫色。成排的栎树树叶从绿色逐渐变成橙色,再变成红色,从高空俯瞰就好比一团团的星火。在这里,还有来自美洲的槭树,树叶由黄变红后,十分艳丽。在附近村民们看来,每到11月,这片色彩斑斓的树木就像被施了魔法的森林一般,美得难以想象,还曾一度被村民误以为是专业的摄影外拍基地。

  嘉定区现有林地中,香樟树占了较大比例。为了改变嘉定林带单一的树种现状,仅去年,区林业站就和中国林业科学研究院亚热带植物研究所合作,引进试种舒马栎、牛栎、黑栎等11个国外彩叶树品种,通过试种和培育开展外来树种的适应性研究。“在引进外来物种大面积推广前,必须经过评估论证、隔离试种、驯化试验和鉴定认定等环节。在确认安全的情况下,再逐步推广种植。”区林业站相关负责人说。

  小严是林业站的新人,每次来到苗圃,面对着同样是苗圃里的“新人”——试种的树种,他总会多带几个塑料密封袋。“我们要给试种的树苗建立一树一档,把它们不同生长阶段的树叶收集下来,放置到专业设备中保存记录。”小严说,“这便于在后期分析嘉定的气候和土壤环境对引进树种的生长影响,以筛选出适合嘉定种植的树种。”

  在小庙村的育种基地内,不同的树种被划分成若干个区域,以便观察其长势。苗圃的中央有一个现代化农业设施大棚,前几年试种栎树产下的种子,将在这里催芽。为了保证小苗的出芽率及整齐度,技术人员采用播种前沙藏的方法对种子进行催芽处理,用无纺布育苗袋法进行播种育苗。

  “同时,我们还采用地膜覆盖的方式以保证种子处于适宜的生长湿度及温度环境。这就好比为每一个婴儿准备婴儿床,让它们生活得更舒适。”小严说。此次育苗品种主要包括纳塔栎、舒马栎等彩叶树种,首批舒马栎已于4月9日全部播种完毕,共计8400余株。预计3到5年后,彩叶树种有望向全区的公益林建设逐步进行推广。可以想象,也许不久的将来,在你家门口,就能感受那种童话故事里层林尽染的“魔法森林”。(李华成)

【纠错】 [责任编辑: 李晓丹 ]

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