选择南方有代表性的森林游憩区进行森林环境中空气负离子水平研究，结果表明：（1）不同林分类型的森林环境中空气负离子水平差异较大。
The studies on the concentration of aero anion in some south China forest recreation areas showed: (1) The aero anion concentration has differences in different forest types.
选择南方有代表性的森林游憩区进行森林环境中空气负离子水平研究，结果表明：（1）不同林分类型的森林环境中空气负离子水平差异较大。
The studies on the concentration of aero anion in some south China forest recreation areas showed: (1) The aero anion concentration has differences in different forest types.
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