在林业生产实践中，用灰色系统模型预测人工林材积生长率有其适用价值。
It is worth while to apply the gray system model to predict the forest growth in practice.
松针红蜡蚧虫口密度与针叶变黑呈正相关，受害木的材积生长率受到较大影响。
The population density shows a positive correlation to the blackening degree of the needle.
松针红蜡蚧虫口密度与针叶变黑呈正相关，受害木的材积生长率受到较大影响。
The population density shows a positive correlation to the blackening degree of the needle.
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