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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (10): 86-93.doi: 10.11707/j.1001-7488.20141012

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Ecological Damage Assessment of Loranthus tanakae (Loranthaceae) in the South Slopes of Qinling Mountain

Cui Bei1, Lin Ruozhu1, Zhao Wenxia1, Lan Zongke2   

  1. 1. Key Laboratory of Forest Protection of State Forestry Administration Research Institute of Forest Ecology, Environment and Protection, CAF Beijing 100091;
    2. Fengxian Forest Bureau of Baoji City, Shaanxi Province Baoji 721000
  • Received:2013-06-18 Revised:2013-12-10 Online:2014-10-25 Published:2014-11-12

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.

Key words: Loranthus tanakae, Qinling Mountain, host preference, parasitism rate

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