Investigation Report on the Damage of Physic Nut in Guizhou Province Caused by the Extraordinarily Freezing Rain and Snow Weather

CHEN Bo-tao; OU Guo-teng; LI Kun

Due to the low temperature of the extreme freezing rain and snow weather,the young forests(aged 1 to 3 years) and the seedlings of the physic nut were seriously damaged by the disaster.It was showed by investigation that the injury ratio for the young forest and the seedlings at the altitude of >600 m was 100%,and all the young forests and the seedling above the altitude of 725 m died.The damage degree of the physics nut on the sunny and semi-sunny slopes was lower than that on shady and semi-shady slopes,and that on the lower and middle parts of the slopes was lower than that on the upper and middle parts of the slopes in the same slope aspect,and the injury degree of the physic nut on the windward was the highest.The average terminal death length of the seedlings in heavy damaged area was 10 to 15 cm,and that on slight damaged area was 0.8 to 4.5 cm.No significant damage was observed for the wild and the semi-wild physic nuts.The reestablishment of the oil-bearing energy forest of the physic nut should be focused on the young forests with injury grade Ⅱand Ⅲ.For the young forests in grade Ⅲ,it is needed to reforest,and for the young forests in grade Ⅱ,it should be managed by artificial pruning,disinfecting,and reinforcement planting,etc.

1. Forestry Science Academy of Guizhou Province,Guiyang 550005,Guizhou,China

2. Forestry Bureau of Luodian County,Luodian 650001,Guizhou,China

3. Research Institute of Resource Insects,CAF,Kunming 650224,Yunnan,China

Received Date: 2008-04-08

Abstract: Due to the low temperature of the extreme freezing rain and snow weather,the young forests(aged 1 to 3 years) and the seedlings of the physic nut were seriously damaged by the disaster.It was showed by investigation that the injury ratio for the young forest and the seedlings at the altitude of >600 m was 100%,and all the young forests and the seedling above the altitude of 725 m died.The damage degree of the physics nut on the sunny and semi-sunny slopes was lower than that on shady and semi-shady slopes,and that on the lower and middle parts of the slopes was lower than that on the upper and middle parts of the slopes in the same slope aspect,and the injury degree of the physic nut on the windward was the highest.The average terminal death length of the seedlings in heavy damaged area was 10 to 15 cm,and that on slight damaged area was 0.8 to 4.5 cm.No significant damage was observed for the wild and the semi-wild physic nuts.The reestablishment of the oil-bearing energy forest of the physic nut should be focused on the young forests with injury grade Ⅱand Ⅲ.For the young forests in grade Ⅲ,it is needed to reforest,and for the young forests in grade Ⅱ,it should be managed by artificial pruning,disinfecting,and reinforcement planting,etc.

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Reference (8)

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Investigation Report on the Damage of Physic Nut in Guizhou Province Caused by the Extraordinarily Freezing Rain and Snow Weather

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