国内朋友请查閱 "百度博客 --- 国际树木学会" (http://hi.baidu.com/%B9%FA%BC%CA%CAF7%C4%BE%D1%A7%BB%E1/blog ) 以取得其他文章。本分会的发表文章都已放弃版权, 任何人都可以自由转载作为教育目的, 但不能作为商业目的盈利。 任何人仕都可以申请免費加入本分会, 本分会员名单从不公开, 有意者请将真实姓名、年龄、单位、职衔、最高学历、电邮和手机号传真到 +852-2679-5338 便可. 如有查询, 请电邮至 egc@netvigator.com 。本分会的一切发表内容, 谨供参考。
会员们:
兹附上两则国内有关树木种植的报导，以便雅俗共赏：
(A) 树木根颈戴套防冻
树木从它的雛形到今天，在地球上大概进化了两亿年左右。树木没有脚，不能逃离逆境或灾难，只能原地适应，其中要对付的逆境就是冬天的严寒。
经过了长年累月的生长适应，基本上地上部的茎干和枝叶，对冬天的环境都会作出生理调整，包括叶片脱落和茎干内部液態浓度加高等等，去进行休眠，保护树体越冬。根部方面，由於土温一般都会比气温高，温差也较少，树根普遍没有树的地上部那么耐寒。
树木的根颈地区，可算得上是树的地上部份，在大自然的生长条件下，有可能要通过大雪堆积的考验，进化当中自然产生耐寒能力。如果在这里给套上塑料圈，这胶圈的表面温度其实与气温相等，起不了多大的升温作用。但是, 在浇水后, 由於塑料圈不很透气, 令到根颈地区经常潮溼，令根冠病的发生率提高。
塑料圈作为防护剪草机的机械伤害是有一定作用, 但是在根颈的外部打上几根小竹子作为阻挡, 可能更快更有效。
(B) 根部安插排水管
俗语所云 : "人望高处, 水往低流"，大自然的水是受到地心吸力的吸引而从高处往低处流。图中所见的几根所谓 "排水管", 除非有外力作用, 否则管内的水也会流向地下，不会自然的往外喷涌。再说排水管是插到泥土里面去, 而不是插到水塘里面去, 所能抽出来的水量只可能是从土里面渗进的一点儿而矣, 至於抽水机能否把它吸出尚待考证中。
至於透气方面，泥土是一个固体，内部空气的渗达是很慢很有限, 也属於是局部性的, 作用不大。
可能真正能够帮助树木在渍水的环境下生长, 只能把根部升高到泡水线以上, 否則又是 "大自然去决定成败, 不是设计者" 吧。
谨此致意!
国际树木学会 中华地区分会 会长 暨 创办人
欧永森
美洲顾问树艺师学会 顾问树艺师号 RCA#497 (http://isahkchina.blogspot.com/2010/12/isa-hkchina-rac-in-asia.html)
澳洲顾问树艺师学会 顾问树艺师号 ACM 0412011 (http://www.iaca.org.au/)
资深树艺师/注册攀树师号 HK-0174BT (http://isahkchina.blogspot.com/2011/03/isa-hkchina-frist-bcma-in-asia.html)
执业树艺师号 IPA-010908 (http://isahkchina.blogspot.com/2010/04/isa-hkchina-tree-news-1441-report.html)
专业调解及谈判学会 注册调解员号 CM-0044 (http://isahkchina.blogspot.com/2012/01/isa-hkchina-mediation.html)
“如果树木在设计和种植时犯错，其护养必然昂贵，而最终也会变成 "不定时炸弹" 。 ”
“速成出来的树木评估员, 只能作出低质量的猜測。 大自然会决定成败。 ”
*** Our weekly Station Mail is for the information of Station Members only, but Station Mail has given up copyright & can be freely circulated. For administrative reasons, comments from outsiders are usually not entertained & may be circulated within our system locally & overseas. Anyone can join ISA HK/China by providing their full name, age, organization, position, highest education, email & mobile no. to egc@netvigator.com . Joining is free & withdrawal is at an email notice. Station Membership is never publicly disclosed. Please note that Station Mail is sometimes given in Blog at http://isahkchina.blogspot.com , although images are usually not attached due to size. All our information is for reference without liabilities. ***
Dear Station Members,
Two sets of Tree News from China:
(A) Insulation Collar at Root Crown for Cold Protection
The attached photos show that a plastic tubing or membrane was installed at the butt level of a tree for "cold protection" for mature trees in China. The description said that the root crown is the easiest part of a tree to suffer cold damage. The insulation would also protect any mechanical damage of the grass trimmer during turf cutting.
It is also mentioned that another way to "protect" cold damage at the root collar level would be "to cover the root collar with a certain thickness of soil as insulation", & this is usually done after watering.
As for the Station Manager, he has seen this kind of plastic collars to be installed mostly on palms at a certain height from ground. He was told that it was for stopping the rats from climbing up the stem to reach the seeds above. The same practice for root collar insulation has not yet been heard of, except in this incident. China may have a different perception when it comes to tree care.
(B) Installation of Piping for Root Irrigation
A particular site in Central China has a drainage problem for the transplanted trees. The landscape contractor then planted the trees at the same soil level without elevation, & then inserted 3 no. of 15 cm diameter PVC pipes at the dripline of the trees to "irrigate out the underground water". The water would be "pumped out" by a machine from time to time through suction in these pipes. The pipes were also said to "improve" aeration at the root level.
The concept of this practice may have taken the assumption that underground water could be easily "pumped out" like water in a pond. In such case, the planting medium would be fluidized.
Good luck to these trees sitting on a pile of water. It would be interesting to find out their survival rate.
best regards,
Sammy Au
Founding President (Station Manager) of ISA HK/China
Registered Consulting Arborist no. RCA#497 (http://isahkchina.blogspot.com/2010/12/isa-hkchina-first-rca-in-asia.html)
Institute of Australian Consulting Arboriculturists Accredited Member no. ACM 0412011 (http://www.iaca.org.au/)
ISA Board Certified Master Arborist / Certified Tree Worker no. HK-0174BT (http://isahkchina.blogspot.com/2011/03/isa-hkchina-first-bcma-in-asia.html)
Independent Practicing Arborist no. IPA-010908 (http://isahkchina.blogspot.com/2010/04/isa-hkchina-hk-tree-news-14410-report.html)
Society of Certified Mediators and Negotiators Certified Mediator no. CM-0044 (http://isahkchina.blogspot.com/2012/01/isa-hkchina-mediation.html)
"Providing treatment without in-depth diagnosis & research support is professional misconduct. "
"Casual tree assessor delivers wanton tree assessment. Mother Nature makes the rules."
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