求翻译：4.3研究区域不同林型不同层次、同一林型不同层次的土壤养分存在着明显的差异。不同林型类型下土壤速效N、速效P、速效K, 全N、全P、全K和有机质的含量均发生了不同程度的变化。是什么意思？

4.3 regional forest research on different levels, and in the same forest types there are clear differences of soil nutrients at different levels. Available soil n, quick-impact under different forest types available p, k, all k and n, p, all with varying degrees of changes in the content of organic matter.