However, The Mongolian pine height, density, DBH and the height and covering degree of grass under forest highly was not remarkable relevance with bird density, respectively.

树的高度、密度、胸径、森林下草的高度， 草的盖度与鸟类密度相关不显著。

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Smaller management density was beneficial to increase DBH growth rate of Chinese pine forest.

较小的经营密度有利于提高人工油松林胸径生长速率。

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