作者研究了北京西山地区人工针叶林林冠空隙和林冠下的土壤及植被状况。
The authors had studied the soils and vegetation in forest gaps and under the canopy in the artificial coniferous forests of the West Mountain of Beijing.
特别是关于人工林是否导致地力退化，针叶林是否引起土壤酸化，一直是国际上争论的焦点。
If the plantation leaded to soil degradation and if conifers cause soil acidification had been the focuses debated in the world.
特别是关于人工林是否导致地力退化，针叶林是否引起土壤酸化，一直是国际上争论的焦点。
If the plantation leaded to soil degradation and if conifers cause soil acidification had been the focuses debated in the world.
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