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Distribution and Optimal Sampling Model of Larval Dendroctonus armandi

He Jie

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Abstract

The population density,distribution,and sampling model of a bark beetle,Dendroctonus armandi,on Huashan conifer,Pinus armandi,were investigated in a forest stand located in Liuba County,Shaanxi Province,China.The results indicated that larval density at a height on the trunk of the trees was different from that at other height within 1 to 10 m;Larval population that caused a mature tree to die averaged at 37.4 larvae·dm-2,with a range of 23.2 ~ 52.8 larvae·dm-2;the average of the sample means was close to that of the sample units taken at the height of 4 m on the trunk;The actual and the estimated peaks appeared at the heights of 7~8 m.

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What this paper is about

The population density,distribution,and sampling model of a bark beetle,Dendroctonus armandi,on Huashan conifer,Pinus armandi,were investigated in a forest stand located in Liuba County,Shaanxi Province,China.The results indicated that larval density at a height on the trunk of the trees was different from that at other height within 1 to 10 m;Larval population that caused a mature tree to die averaged at 37.4 larvae·dm-2,with a range of 23.2 ~ 52.8 larvae·dm-2;the average of the sample means was close to that of the sample units taken at the height of 4 m on the trunk;The actual and the estimated peaks appeared at the heights of 7~8 m.

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Available abstract

The population density,distribution,and sampling model of a bark beetle,Dendroctonus armandi,on Huashan conifer,Pinus armandi,were investigated in a forest stand located in Liuba County,Shaanxi Province,China.The results indicated that larval density at a height on the trunk of the trees was different from that at other height within 1 to 10 m;Larval population that caused a mature tree to die averaged at 37.4 larvae·dm-2,with a range of 23.2 ~ 52.8 larvae·dm-2;the average of the sample means was close to that of the sample units taken at the height of 4 m on the trunk;The actual and the estimated peaks appeared at the heights of 7~8 m.

Key concepts: Larva, Bark beetle, Bark (sound), Population, Population density, Range (aeronautics), Biology, Pinus <genus>

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