七王坟古油松濒死原因的研究

An Invesngation Report on the Causes of Endangered Old Pinus tabulaeformis at Qiwangfen

通过系列调查研究，确认七王坟古油松的濒死不是因为空间拥挤、光照不足、蛀干害虫危害以及一般营养元素的缺乏，而是古庙遗址三合土块、石灰块的存在，使下层土壤ＣａＣＯ＿３含量增高，土壤碱性化，再加上多次高强度修枝等因素长期影响古油松生长所致。

A series of investigations have demonstrated that the endangered trees of oldPinus tabulaeformis at Qiwangfen(the grave of the emperor's son of the Tang Dynasty)arenot caused by small space,lack of sunlight,borer damage or a shortage of soil alkalization.The real reasons are the clod of lime,mud and sand scattered under the relics of old temples.In addition,the annual overpruning has long been the factor affecting the growth of old Pinustabulaeformis.