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Citation:

Effects of Planting Density and Site Quality on Stand Volume of Chinese Fir Plantation

  • Received Date: 2013-03-18
  • In this study, 3-parameter Weibull growth equation was used for modeling the mean annual increment (MAI), including mean annual gross increment (MAIgross) and mean annual net increment (MAInet), of 26-year-old Chinese fir (Cunninghamia lanceolata) experiment plantation. The relationship between the maximum value of MAI and the site index and planting density, and the relationship between the culmination age of MAI and these two factors were analyzed by the method of partial correlation and stepwise linear regression. The conclusions are as follows: (1) The MAInet was effected by site quality, there was a significan positive linear correlation between these two stand factors, the mean MAInet value was 8.33 m3·hm-2·a-1 bigger in stands with site index of 22 m than that with site index of 12 m. Vgross compose of Vnet and ∑Vm, which were effected by site quality and planting density, and MAIgross increased with the site index and planting density (r=0.813 5, p=0.000 4;r=0.926 1, p=0.000 0, respectively). (2) Because of the competition among trees and nutrition limitation after crown closed, there was a significan negative correlation between MAInet and planting density (r= -0.666 9, p=0.009 2), the planting density was the reason slowing the tree's growth. The MAInet of the plots with density of 1 mࡧ m was 3.88 years smaller than that with the density of 2 mࡩ m. However, there was no significant difference in MAInet among the stands with medium planting density.
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Effects of Planting Density and Site Quality on Stand Volume of Chinese Fir Plantation

  • 1. Research Institute of Forestry, Chinese Academy of Forestry, Beijing 100091, China

Abstract: In this study, 3-parameter Weibull growth equation was used for modeling the mean annual increment (MAI), including mean annual gross increment (MAIgross) and mean annual net increment (MAInet), of 26-year-old Chinese fir (Cunninghamia lanceolata) experiment plantation. The relationship between the maximum value of MAI and the site index and planting density, and the relationship between the culmination age of MAI and these two factors were analyzed by the method of partial correlation and stepwise linear regression. The conclusions are as follows: (1) The MAInet was effected by site quality, there was a significan positive linear correlation between these two stand factors, the mean MAInet value was 8.33 m3·hm-2·a-1 bigger in stands with site index of 22 m than that with site index of 12 m. Vgross compose of Vnet and ∑Vm, which were effected by site quality and planting density, and MAIgross increased with the site index and planting density (r=0.813 5, p=0.000 4;r=0.926 1, p=0.000 0, respectively). (2) Because of the competition among trees and nutrition limitation after crown closed, there was a significan negative correlation between MAInet and planting density (r= -0.666 9, p=0.009 2), the planting density was the reason slowing the tree's growth. The MAInet of the plots with density of 1 mࡧ m was 3.88 years smaller than that with the density of 2 mࡩ m. However, there was no significant difference in MAInet among the stands with medium planting density.

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