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Citation:

Study on the Self-pruning of Chinese Fir Plantation

  • Received Date: 2013-07-25
  • The data of 25 years’ positional observation were used to investigate the effects of self-pruning on Chinese fir (Cunninghamia lanceolata) plantations. The study examined five initial density levels (2m×3m, 2m×1.5m, 2m×1m, 1m×1.5m, and 1m×1m) with three replications at each level based on the randomized block design. The higher the initial planting density, the sooner the self-pruning happened and the higher the self-pruning intensity was. While living crown ratio (CL/TH) decreased to 0.4, the CL/TH ratio fluctuation tended to a constant. When the CL/TH ratio decreased to 0.3, the self-thinning happened, regardless the initial planting density and mortality. When self-pruning happened, the ratio of tree crown width to the living crown height (CW/CH) rapidly increased, then slowly increased during the early self-thinning and increased rapidly again during the late self-thinning. However, the CW/CH ratio was always below 1. Allocation pattern with assimilation matter changed when self-pruning happened, and stem form index (H/D) decreased when the living crown ratio increased.
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Study on the Self-pruning of Chinese Fir Plantation

  • 1. Research Institute of Subtropical Forestry, Chinese Academy of Forestry, Fuyang 311400, Zhejiang, China
  • 2. Key Laboratory of Tree Breeding and Cultivation, State Forestry Administration, Research Institute of Forestry, hinese Academy of Forestry, Beijing 100091, China

Abstract: The data of 25 years’ positional observation were used to investigate the effects of self-pruning on Chinese fir (Cunninghamia lanceolata) plantations. The study examined five initial density levels (2m×3m, 2m×1.5m, 2m×1m, 1m×1.5m, and 1m×1m) with three replications at each level based on the randomized block design. The higher the initial planting density, the sooner the self-pruning happened and the higher the self-pruning intensity was. While living crown ratio (CL/TH) decreased to 0.4, the CL/TH ratio fluctuation tended to a constant. When the CL/TH ratio decreased to 0.3, the self-thinning happened, regardless the initial planting density and mortality. When self-pruning happened, the ratio of tree crown width to the living crown height (CW/CH) rapidly increased, then slowly increased during the early self-thinning and increased rapidly again during the late self-thinning. However, the CW/CH ratio was always below 1. Allocation pattern with assimilation matter changed when self-pruning happened, and stem form index (H/D) decreased when the living crown ratio increased.

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