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近年在绿化工作中,笔者遇到这样一个现象:城市中刚栽植的行道树,由于人为破坏或其他原因死亡,再次补栽时,成活率却极低,且出现年年补、年年死的现象。这是什么原因呢?经过仔细的调查和研究。在去年秋季的苗木补栽中,我们及时采取了一些措施,今春欣喜地发现,补植的100多棵行道树全部成活。主要原因是我们做好了以下环节:挖穴树穴严格按照施工要求挖大、挖深(我们这次补栽的树木胸径为6～8厘米,挖穴1米见方),遇到建筑垃圾还要扩大2～3倍,这样在一定程度上避免了积水。同时埘那些长期被污水浸泡的树穴进行换土。消毒原来树穴内由于树根腐烂等原因,滋生了大量有害细菌和真菌,所以要进行消毒处理。可用农用链霉素
In recent years in the greening work, I encountered such a phenomenon: the city has just planted trees in the road, due to man-made damage or other causes of death, replanting again, the survival rate is very low, and appear year after year, year by year dead phenomenon . What is the reason? After careful investigation and research. In the replanting of last year’s seedlings, we took some measures in time. This year, we are delighted to find that all the more than 100 tree-planting trees that replant themselves have survived. The main reason is that we do the following links: digging holes in strict accordance with the requirements of construction excavation, dug deep (we replant the trees diameter of 6 to 8 cm, dug 1 meter square), encountered construction waste also To expand 2 to 3 times, so to some extent, avoid water. At the same time 埘 those who have been soaked in sewage for a long time to change soil. Sterilization of the original tree roots rot due to other reasons, breeding a large number of harmful bacteria and fungi, so to be disinfected. Available agricultural streptomycin