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Scientia Silvae Sinicae ›› 2006, Vol. 42 ›› Issue (12): 68-72.doi: 10.11707/j.1001-7488.20061212

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Studies on Influence of Poplar Canker and Pine Wood Nematode on the Electrical Indexes of Tree Stem

Liang Jun,Qu Zhiwei,Liu Huiwen,Jia Xiuzhen,Zhang Xingyao   

  1. Research Institute of Forest Ecology, Environment and Protection, CAF Key Laboratory of Forest Protection and Ecology Environment of State Forestry Administration Beijing 100091
  • Received:1900-01-01 Revised:1900-01-01 Online:2006-12-25 Published:2006-12-25

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Abstract:

The paper studied the influence of biological stresses including poplar canker and pine wood nematode on the electrical indexes of trees. The results showed that the activity of peroxidase (POD) increased and then decreased, activity of polyphenoloxidase (PPO) and tree stem impedance increased gradually, tree stem capacitance and unit capacitance decreased after Populus tomentosa cuttings was infected with Botryosphaeria dothidea. The statistical difference of activity of POD was showed earlier than tree stem capacitance, while the difference of tree stem capacitance was showed earlier than activity of PPO. Tree stem capacitance and unit capacitance had significant positive correlation with the ratio of wilt needles to all needles. The accuracy rate could reach 89.26% when 0.5 Nf threshold of tree capacitance was used to estimate whether the Pinus massoniana was infected with Bursaphelenchus xylophilus.

Key words: tree stem capacitance, tree stem impedance, poplar canker, pine wood nematode