A decreasing trend in the growth of the plants was evident from the low-density treatment to the high-density treatment ( Figure 3 b).
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Effects of Contaminated Soil on the Survival and Growth Performance of European (<i>Populus tremula</i> L.) and Hybrid Aspen (<i>Populus tremula</i> L. <i>× Populus tremuloides</i> Michx.) Clones Based on Stand Density.
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