关键词: 杉木, 种子产量, 预测模型

Abstract:

The predicting models of cone crop/seed yield of Chinese fir seed orchard were established on Qifeng shan forestry farm in Yang xin County of Hubei Province by means of the method of visible crown, information section in crown, tree growth factors and climatic factors respectively.The results showed that there were closely linear relations of the number of female cones and immature cones of visible crown or of the optimum information section, and the crown diameter of the female tree with the cone crop of a tree. However, the predicting model via the optimum information section was most accurate among the cone crop predicting models while the predicting model via immature cones was more accurate than that via female cones.The number of seeds in a cress section of a cone and the cone volume could accurately predict the number of full seeds in a cone.A model via the key climatic factors for seed yield was accurate enough. Each model had its own merit on simplicity, applicability or the predicting period, but the tests of all models were at significant level and could be selected to use according to the requirement of practice.

Key words: Cunninghamia lanceolata (Lamb.)Hook., Seed yield, Predicting model