Stand density index (SDI) was applied as a quantitative index to measure mean crowd degree between trees.

选择林分密度指数(SDI)作为反映林分中林木之间平均拥挤指标。

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The urban air quality was graded and density index of environment quality was calculated to obtain corresponding assessment results.

同时，对阜新市大气环境质量进行了评价，计算出阜新市环境质量浓度指数并得到相应的评价结果。

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Repameterizing the average tree height growth model improved the fitting results a lot by introducing site index and density index variables.

引入地位指数和密度指数可大幅提高林龄单因变量平均高生长模型的拟合度。

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