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明朝杨桃树 今朝称“树王”
2017-08-09 07:03:33 中国青年网
每个生命都有自己的期限,古树历经几百年沧桑,生长进入了衰退阶段,尤其需要特别的养护。记者留意到,这棵古树从根部到顶部,整个躯干都呈褐色。树皮上还附生着不少树藓等,树下则长出了芒果、蕨草等植物。青秀区园林所助理工程师黄仕康介绍说,从古树的现状可以看出,历尽沧海桑田,古树肯定遭遇过雷劈等自然灾害的侵袭,“比如,树干空洞,在枝桠上又新长出新藤,而树皮有的已经被蛀空了,而且不排除树干上有蚂蚁、白蚁等侵害的情况”。接下来,工作人员将对古树进行施肥、除虫、加固、复壮等护理,而且要加强巡查,了解古树最新生长状况。
一棵古树,人们如何才能知道它多少岁了呢?“其实测量方法有点复杂。”黄仕康说,为了更准确地计算这棵古树的年轮,青秀区园林所和广西林科院的专家采取了人工测量和仪器测量两种方式进行测量。“一般来说,树龄可以靠树轮来推断,但是我们不能把树砍掉。”黄仕康说,通过量度树的胸径、地径、冠幅和高度,再依据树种来判定,这种方法对于老树比较准确,但年轻的树就不太准确了。
“从树木的地面高度至其根部1.2米处,采用一个特殊的仪器进行测量鉴定,用皮尺测量其胸径,然后套用公式,从而推测出其年龄。”据测定,这棵杨桃树至今有500多年,杨村有300多年的历史,也就是说,这棵杨桃树在杨村之前就已经存在200多年。另据透露,这棵杨桃树也是青秀区现存记录存活最长的杨桃树,“杨桃王”名副其实。
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