Study on Criterion for Selecting Betula alnoides Superior Trees

LIU Guang-jin; CHEN Hong-hui; GUO Wen-fu; JIA Hong-yan; MA Yue

Based on quantity indexes (DBH, tree height and individual volume) in combination with quality indexes (stem form, crown/height ratio and branch size), the selection criterion of Betula alnoides superior trees was established using a method of five-dominant-trees. By analyzing the superior tree selection criteria for B. alnoides plantation during different age stages ranged from 10 to 21 years, it was proposed that the strategy of superior tree selection for this species involved as follows: the DBH, tree height, and individual volume of superior tree were respectively 9%-11%, 5%-7% and 26%-31% greater than that of five-dominant-trees, and the multiple shape score was higher than 7.5. Thirty seven in 109 candidate trees were selected according to this criterion and the selected ratio was 33.9%. The superior tree selection criterion should be modified in the practice according to different stand conditions. Since the B.alnoides plantations were managed for large-size timber production, the growth index should be regarded as the principal factor for selection of superior trees so as to obtain high genetic gain. On the other hand, the wood property and resistance should also be considered to insure the genetic diversity of B.alnoides breeding population.

1. Experimental Center of Tropical Forestry, Chinese Academy of Forestry, Pingxiang 532600, Guangxi, China

Received Date: 2012-01-16

Available Online: 2012-08-20

Abstract: Based on quantity indexes (DBH, tree height and individual volume) in combination with quality indexes (stem form, crown/height ratio and branch size), the selection criterion of Betula alnoides superior trees was established using a method of five-dominant-trees. By analyzing the superior tree selection criteria for B. alnoides plantation during different age stages ranged from 10 to 21 years, it was proposed that the strategy of superior tree selection for this species involved as follows: the DBH, tree height, and individual volume of superior tree were respectively 9%-11%, 5%-7% and 26%-31% greater than that of five-dominant-trees, and the multiple shape score was higher than 7.5. Thirty seven in 109 candidate trees were selected according to this criterion and the selected ratio was 33.9%. The superior tree selection criterion should be modified in the practice according to different stand conditions. Since the B.alnoides plantations were managed for large-size timber production, the growth index should be regarded as the principal factor for selection of superior trees so as to obtain high genetic gain. On the other hand, the wood property and resistance should also be considered to insure the genetic diversity of B.alnoides breeding population.

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Study on Criterion for Selecting Betula alnoides Superior Trees

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