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Article Navigation >  Forest Research  > 2010 >  23(3): 342-348

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The Impact of Poplar Diameter Characteristics on Disease Index of Canker

  • 1.

    Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forestry Protection, State Forestry Administration, Beijing 100091, China

  • 2.

    Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, Shaanxi, China

  • 3.

    Qingtongxia Forestry Bureau of Ningxia Hui Autonomous Region, Qingtongxia 751600, Ningxia, China

  • 4.

    Forest Diseases and Pests Control Quarantine Station of Langfang City, Hebei Province, Langfang 065000, Hebei, China

  • 5.

    Station of Forest Protection, Beijing Municipal Bureau of Landscape and Forestry, Beijing 100029, China)

  • Based on the data of 60 standard sites of poplar plantations diameter which included Populus×euramericana cv.'Guarinento’ and Populus alba var.pyramidalis,8 diameter characteristics indicators were selected which included three weibull distribution parameters of diameter(location parameter(A), scale parameter(B), shape parameter(C)), average DBH(D/em>0), average DBH of poplar which was infected with canker(D1), average DBH of poplar which was uninfected with canker (D/em>2), the diameter of poplar which had the largest lesion canker (D/em>3), and the diameter of the poplar which had the smallest lesion canker (D/em>4). The relationship between 8 diameter characteristics indicators and disease index of canker(DI) was studied, the result showed that A, C, D/em>4 had a negative correlation with DI for Populus×euramericana cv. 'Guarinento’ and Populus alba var. pyramidalis;D/em>3 had a negative correlation with DI for Populus×euramericana cv. 'Guarinento’ only;B had a positive correlation with DI for Populus alba var. pyramidalis only.D/em>0,D/em>1, and D/em>2 had no significant correlation with DI. On the same poplar clone,the tree that had big DBH was more susceptible to canker disease than that had smaller DBH, and thinning of small diameter trees, which was infected with canker could control canker diseases.
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The Impact of Poplar Diameter Characteristics on Disease Index of Canker

  • 1. Research Institute of Forest Ecology, Environment and Protection, Chinese Academy of Forestry, Key Laboratory of Forestry Protection, State Forestry Administration, Beijing 100091, China
  • 2. Northwest Sci-Tech University of Agriculture and Forestry, Yangling 712100, Shaanxi, China
  • 3. Qingtongxia Forestry Bureau of Ningxia Hui Autonomous Region, Qingtongxia 751600, Ningxia, China
  • 4. Forest Diseases and Pests Control Quarantine Station of Langfang City, Hebei Province, Langfang 065000, Hebei, China
  • 5. Station of Forest Protection, Beijing Municipal Bureau of Landscape and Forestry, Beijing 100029, China)

Abstract: Based on the data of 60 standard sites of poplar plantations diameter which included Populus×euramericana cv.'Guarinento’ and Populus alba var.pyramidalis,8 diameter characteristics indicators were selected which included three weibull distribution parameters of diameter(location parameter(A), scale parameter(B), shape parameter(C)), average DBH(D/em>0), average DBH of poplar which was infected with canker(D1), average DBH of poplar which was uninfected with canker (D/em>2), the diameter of poplar which had the largest lesion canker (D/em>3), and the diameter of the poplar which had the smallest lesion canker (D/em>4). The relationship between 8 diameter characteristics indicators and disease index of canker(DI) was studied, the result showed that A, C, D/em>4 had a negative correlation with DI for Populus×euramericana cv. 'Guarinento’ and Populus alba var. pyramidalis;D/em>3 had a negative correlation with DI for Populus×euramericana cv. 'Guarinento’ only;B had a positive correlation with DI for Populus alba var. pyramidalis only.D/em>0,D/em>1, and D/em>2 had no significant correlation with DI. On the same poplar clone,the tree that had big DBH was more susceptible to canker disease than that had smaller DBH, and thinning of small diameter trees, which was infected with canker could control canker diseases.

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