Center setting of circular plot in the investigation of plantation density

LI Jin-liang; ZHENG Xiao-xian

Volume 25 Issue 1

Jun. 2018

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LI Jin-liang, ZHENG Xiao-xian. Center setting of circular plot in the investigation of plantation density[J]. Journal of Zhejiang A&F University, 2008, 25(1): 55-59.

Citation:

LI Jin-liang, ZHENG Xiao-xian. Center setting of circular plot in the investigation of plantation density[J]. Journal of Zhejiang A&F University, 2008, 25(1): 55-59.

Center setting of circular plot in the investigation of plantation density

1.
The Key Laboratory for Forest Silviculture and Conservation of the Ministry of Education, Beijing Forestry University, Beijing 100083, China

Received Date: 2007-03-07
Rev Recd Date: 2007-09-12
Publish Date: 2008-02-10

Abstract

Plantation density is one of the key indices in the management of short-rotation industry material plantation. In order to meet the requirements of investigation on plantation stands, we employed the method of computer-aided simulation, and studied the effects of different centers of circle on the error in the circular investigation of plantation density. Results show that:1) the number of individual trees differs in sample circles with the same spacing and different coordinates, with an evident variation. For the plantation with the same density, the number of trees in the sample circle with the same center also changes under different spacing. 2) in the situation with the same spacing, the mean value of plantation density, using 24 random points as centers of circle, could present the fact. 3) for the sample circle with a designed spacing of 1.50 m×4.00 m and 2.00 m×3.75 m, the optimum coordinate of the center of circle is(0, 0) m. 4) for the spacing of 2.00 m×3.00 m, the optimum coordinate of the center of circle is(1.5, 0) m. 5) for the planting spacing of 1.20 m×5.00 m, the optimum coordinate of the center of circle is(0, 1.0) m. 6) for the planting spacing of 2.00 m×4.00 m, the optimum center of circle is located in the middle of two neighboring rows with a coordinate of(0, 2.0) m.
- forest mangement,
- plantation,
- density,
- sample circle,
- coordinate of the center of circle,
- error

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通讯作者: 陈斌, bchen63@163.com

1.
沈阳化工大学材料科学与工程学院沈阳 110142

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Center setting of circular plot in the investigation of plantation density

1. The Key Laboratory for Forest Silviculture and Conservation of the Ministry of Education, Beijing Forestry University, Beijing 100083, China

Received Date: 2007-03-07

Rev Recd Date: 2007-09-12

Publish Date: 2008-02-10

Key words:

Abstract: Plantation density is one of the key indices in the management of short-rotation industry material plantation. In order to meet the requirements of investigation on plantation stands, we employed the method of computer-aided simulation, and studied the effects of different centers of circle on the error in the circular investigation of plantation density. Results show that:1) the number of individual trees differs in sample circles with the same spacing and different coordinates, with an evident variation. For the plantation with the same density, the number of trees in the sample circle with the same center also changes under different spacing. 2) in the situation with the same spacing, the mean value of plantation density, using 24 random points as centers of circle, could present the fact. 3) for the sample circle with a designed spacing of 1.50 m×4.00 m and 2.00 m×3.75 m, the optimum coordinate of the center of circle is(0, 0) m. 4) for the spacing of 2.00 m×3.00 m, the optimum coordinate of the center of circle is(1.5, 0) m. 5) for the planting spacing of 1.20 m×5.00 m, the optimum coordinate of the center of circle is(0, 1.0) m. 6) for the planting spacing of 2.00 m×4.00 m, the optimum center of circle is located in the middle of two neighboring rows with a coordinate of(0, 2.0) m.

Center setting of circular plot in the investigation of plantation density

Abstract

References

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通讯作者: 陈斌, bchen63@163.com

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