求翻译：通过对各林分类土壤化学性质的变化情况分析, 结果表明, 同一林型的表层土壤因土层深度的增加各养分指标均有明显的差异，由于凋落物，降水，吸收根分布等因素的影响，速效N、速效P、速效K、全N、有机质的含量总的趋势是上层即腐殖质层含量较高,向下逐渐下降.,养分主要集中在表层，而全K、全P无明显的变化规律。各林型的土壤肥力存在着较大的差异,因此在制订营林措施和施肥方案时,应充分考虑这些差异,因地制宜。是什么意思？

Through on all forest classification soil chemical nature of changes situation analysis, results indicates that, same forest types of surface soil because soil depth of increased all nutrient indicators are has obvious of differences, because litter property, precipitation, absorption root distribution, factors of effect, quick-impact n, and quick-impact p, and quick-impact k, and full n, and organic matter of content total of trend is upper is humus layer content higher, down gradually decline., nutrient main concentrated in surface, and full k, and full p no obvious of changes law. There is large difference of soil fertility of forest types, so at the time of development of silvicultural measures and fertilization scheme, should take full account of these differences, suit measures to local conditions.