A long-term forecast method of timber growth ring density based on process neural network was proposed in this paper.

提出一种基于过程神经网络的木材生长轮密度长期预测方法。

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So it is very important to find out the variation regulation of wood ring density in growth process.

解剖树木生长过程木材密度变化规律，研究年轮内密度的变化十分重要。

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As planting density increased, the growth ring width and tracheid row decreased but proportion of late wood increased.

造林密度大，则生长轮变窄，管胞列数减少，晚材率增加。

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