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。
We took different forest types with different standards into account when dividing by stocking volume per unit area. Therefore, we should consider forest types as an indicator standard further.
在单位面积蓄积量的标准划分时充分考虑到了不同林型标准不同，进而分林型进行指标标准的划分。
We took different forest types with different standards into account when dividing by stocking volume per unit area. Therefore, we should consider forest types as an indicator standard further.
在单位面积蓄积量的标准划分时充分考虑到了不同林型标准不同，进而分林型进行指标标准的划分。
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