在近期的行道树实际养护管理过程中,经常出现不明原因的长势不佳、萎缩,甚至死亡等现象,我们通过开挖树穴,发现有部分树木根部发黑以及树皮发红。出现此种情况的行道树大多数集中在上海老城区(历史风貌保护区附近),该区域经历过多次市政改造,我们推测有可能是水务和燃气公司的地下排管对行道树的根部产生影响。根部积水影响树木生长可以通过开挖树穴较直观的发现问题,而燃气影响则没有那么明显。笔者虽然怀疑燃气管道泄漏影 In the recent process of actual conservation and management of roadside trees, we often find phenomena such as poor growth, shrinkage and even death due to unknown causes. We found some of the tree roots were black and the bark was reddish by digging the tree holes. Most of the street trees in this situation are concentrated in the Old City of Shanghai (near historic conservation areas), where the municipal administration has undergone many transformations. We speculate that it is likely that underground pipelines of water and gas companies have an impact on the roots of the street trees. Waterlogging can affect the growth of trees by digging more intuitive tree found problems, and gas is less obvious. Although I suspect gas pipeline leak shadow