Growth and Mortality of Size-class Model for Spruce-Fir Mixed Forests in Over-cutting Forest Area of Changbai Mountains, Northeast China

GONG Zhi-wen; KANG Xin-gang; GU Li; YANG Hua

The authors studied the data of 4 permanent observation plots of spruce-fir forests in over-cutting forest area of Changbai Mountains, northeast China. These plots were continuously observed for 12 years from 1978 to 1990. In this paper, using the diameter and periodic annual increment data of main coniferous species,i.e. Pinus koraiensis, Abies nephrolepic and Picea koraiensis, the transition probability model is established, and the average increment of diameter grade is predicted. Evaluated with the data of 1990, it is found that the practical application error of probabilistic model is small and the precision is high. The authors analyzed the mortality distribution of each species among 12 years from 1978 to 1990, the results show that Weibull function is suitable for modeling uneven-aged spruce-fir forests.

1. Post-Doctoral Science Research Station of Agricultural and Forestry Economics and Management,Beijing Forestry University, Beijing 100083,China

3. Key Laboratory for Silviculture and Conservation of Ministry of Education,College of Forestry,Beijing Forestry University,Beijing 100083,China)

Abstract: The authors studied the data of 4 permanent observation plots of spruce-fir forests in over-cutting forest area of Changbai Mountains, northeast China. These plots were continuously observed for 12 years from 1978 to 1990. In this paper, using the diameter and periodic annual increment data of main coniferous species,i.e. Pinus koraiensis, Abies nephrolepic and Picea koraiensis, the transition probability model is established, and the average increment of diameter grade is predicted. Evaluated with the data of 1990, it is found that the practical application error of probabilistic model is small and the precision is high. The authors analyzed the mortality distribution of each species among 12 years from 1978 to 1990, the results show that Weibull function is suitable for modeling uneven-aged spruce-fir forests.

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Reference (25)

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Growth and Mortality of Size-class Model for Spruce-Fir Mixed Forests in Over-cutting Forest Area of Changbai Mountains, Northeast China

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