林业科学Issue(10)：86-93,8.DOI:10.11707/j.1001-7488.20141012
秦岭南坡北桑寄生生态危害状况评价
Ecological Damage Assessment of Loranthus tanakae (Loranthaceae) in the South Slopes of Qinling Mountain
摘要
Abstract
Loranthus tanakae,one of the most common parasitic seed plants,mainly infests oak trees in the South Slope of Qinling Mountains. To explore the distribution pattern and damage status of L. tanakae,a comprehensive survey and typical sample investigation were conducted in Fengxian County. The results revealed that Quercus aliena var. acutiserrata Maxim. ex Wenz. was the preferential host of L. tanakae. L. tanakae radially distributed from the center of the oak forest,mainly infested mature and over mature oak trees of 40-to 50-years-old and prefered the southern aspect of the canopy. The maximum diameter of a cluster of L. tanakae could reach 160 cm and the diameter had a linear positive correlation with the host ages. Parasitism rate in the plots was 29. 03% of all kind of tree species and 36. 90% of Q. aliena var. acutiserrata. Furthermore,parasitism rate on the primary branches of the all infected trees was 49. 53%. With seriously affected by L. tanakae,growth and vigor of the infected hosts were clearly harmed,resulting in death of the distal branches. Populations of L. tanakae had been increased with its host density in virtue of the implementation of the Natural Forest Protection Project. Although only parts of the hosts were threatened,potential ecological damage and large scale eruption of L. tanakae should not be overlooked.关键词
北桑寄生/秦岭/寄主选择/寄生率Key words
Loranthus tanakae/Qinling Mountain/host preference/parasitism rate分类
农业科技引用本文复制引用
崔贝,林若竹,赵文霞,兰宗科..秦岭南坡北桑寄生生态危害状况评价[J].林业科学,2014,(10):86-93,8.基金项目
国家林业局林业标准制修订项目(2010－LY－78)。 （2010－LY－78）
