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Citation:

Effects of Planting Density on Growth and Economic Benefit of Masson Pine Plantation

  • Received Date: 2010-09-25
  • The effects of planting density on growth and economic benefit of Masson pine (Pinus massoniana) plantation were analyzed with the data of 21-year-old planting density experiment stand (the planting densities were 1 667, 3 333, 5 000, and 6 667 trees·hm-2 respectively), the results showed that the planting density had significant effect on stand growth and structure. With the increase of stand density, the diameter at breast height (DBH), the single tree volume and the crown diameter decreased, but the ratio of tree height/DBH increased. However, the difference of these factors decreased with stand age increasing at 16-year-old. The stand volume and the timber yield increased with stand density increasing at the juvenile stage, but the difference of these factors decreased when stand entered middle-aged stage. For 21-year-old stand, the timber yields of the four treatments of planting density were 300.13, 309.94, 303.19 and 313.32 m3·hm-2 respectively. The percentages of small-diameter trees and the yield of small-diameter logs increased with the increase of stand density. With stand age increasing, the correlation between NPV and stand density transformed from positive to negative. With the increase of planting density, the economic mature age advanced. By a synthetic analysis of yield, economic evaluation and growth law of Masson pine plantation, the optimal planting density for producing pulpwood or small-diameter timber could be determined as 2 200~3300 trees·hm-2, while that for producing large- or middle-diameter timber could be determined as 1 667~2 200 trees·hm-2.
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Effects of Planting Density on Growth and Economic Benefit of Masson Pine Plantation

  • 1. Experimental Centre of Tropical Forestry, Chinese Academy of Forestry,Pingxiang 532600, Guangxi, China
  • 2. College of Forestry, Guizhou University, Guiyang 550025, Guizhou, China

Abstract: The effects of planting density on growth and economic benefit of Masson pine (Pinus massoniana) plantation were analyzed with the data of 21-year-old planting density experiment stand (the planting densities were 1 667, 3 333, 5 000, and 6 667 trees·hm-2 respectively), the results showed that the planting density had significant effect on stand growth and structure. With the increase of stand density, the diameter at breast height (DBH), the single tree volume and the crown diameter decreased, but the ratio of tree height/DBH increased. However, the difference of these factors decreased with stand age increasing at 16-year-old. The stand volume and the timber yield increased with stand density increasing at the juvenile stage, but the difference of these factors decreased when stand entered middle-aged stage. For 21-year-old stand, the timber yields of the four treatments of planting density were 300.13, 309.94, 303.19 and 313.32 m3·hm-2 respectively. The percentages of small-diameter trees and the yield of small-diameter logs increased with the increase of stand density. With stand age increasing, the correlation between NPV and stand density transformed from positive to negative. With the increase of planting density, the economic mature age advanced. By a synthetic analysis of yield, economic evaluation and growth law of Masson pine plantation, the optimal planting density for producing pulpwood or small-diameter timber could be determined as 2 200~3300 trees·hm-2, while that for producing large- or middle-diameter timber could be determined as 1 667~2 200 trees·hm-2.

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