云杉矮槲寄生对云杉生长及生理指标的影响

摘要

To understand the harm status of dwarf mistletoe to natural and secondary spruce forests in Qinghai , the growth and physiological indices of spruce branches and leaves suffering varying de-grees of damage were measured .The results showed that when spruce subjected to dwarf mistletoe infestation, its growth and physiological indicators changed drastically , and with increasing of harm degree , the competition for water and photosynthetic products between dwarf mistletoe and spruce branch increased , which result in spruce nutritional imbalance , weak growth and death .%为了解云杉矮槲寄生对青海省云杉天然林区和次生林区的危害状况，测定了矮槲寄生不同危害程度下的云杉枝条和叶片的生长及生理指标。结果表明：当云杉遭受矮槲寄生侵染后，其生长和生理指标均发生较大改变，并随危害等级的加大，云杉抽生的大量丛枝与云杉之间争抢水分和光合产物增多，是使得云杉自身营养失衡、生长衰弱、直至死亡的主要原因。避免矮槲寄生于云杉，可促进云杉林区的健康发展。