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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (6): 152-159.doi: 10.11707/j.1001-7488.20140620

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Variation in Growth and Wood Property and the Structure Differentiation of Schima superba Plantation with Different Sites, Stand Densities and Ages

Chu Xiuli1, Wang Yi1, Jin Guoqing1, Fan Huihua2, Zhou Zhichun1   

  1. 1. Research Institute of Subtropical Forestry, CAF Fuyang 311400;
    2. Fujian Academy of Forestry Fuzhou 350012
  • Received:2013-06-13 Revised:2013-08-12 Online:2014-06-25 Published:2014-07-07
  • Contact: 周志春

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Abstract:

In this paper, the growth, wood basic density, diameter distribution and structure stability of Schima superba plantation were investigated in 12 sample plots with different biotopes, operating measures and ages in Nanping and Sanming city of Fujian province. Results showed that, the average tree height, diameter at breast height (DBH) and individual volume of stand in shady slope were significantly larger than that of plantation in sunny slope; The tree growth, especially in DBH and individual volume of stand, in lowerslope was obviously greater than that in the middleslope and the upperslope; The average tree height of the stand increased with initial planting density; However, DBH and individual volume displayed converse trend with increase of planting density; Growth of the plantation gradually increased with stand age; Average individual volume of trees at 29 age was over 4 times greater than of trees at 13 age, and the 46-year-old stand still grew fast. There were no significant differences in wood basic density between different aspects of slope; However, the wood basic density in upperslope was significantly greater than that in middleslope and lowerslope; The wood basic density was relatively greater when the initial spacing was set at 1 667 plants per hectare; The greater or less stand density significantly reduced the wood basic density and hence wood properties; Wood basic density progressively reduced with the forest age and the varied pattern met with the variation type of Pashin Ⅲ. Differentiation in height and diameter growth and wood basic density of the plantations with the same age in the same direction and position of slope was relatively small. But the initial stand density obviously affected growth. The smaller the initial planting density the greater the variation in diameter was. The diameter distribution of S. superba plantation in different habitats (slope, position of slope), with forest management measures (initial stem-numbers) and ages was well fitted to the cumulative distribution function of Weibull distribution; The diameter distribution exhibited a reverse "J" type, suggesting the stands had a stable structure with reasonable competition and strong adaptability. The class Ⅱ and Ⅲ were the main trees in the stands according to tree classification, which also lent support that the structure of the plantations was stable. Thus, a suitable site and stand density should be selected according to the goal of cultivation. For example, forestation for large diameter of S. superba the plantation should be conducted on the shady slopes, lowerslopes and initial planting density should be 1 667 stems per hectare. Although the structure differentiation of the plantation is not obvious, appropriate thinning and density control should be applied for large diameter timber.

Key words: Schima superba, plantation, growth, wood basic density, diameter distribution

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