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对苏南丘陵区的杉木林、火炬松林、次生栎林及毛竹林生长期内林下土壤养分含量的动态特性进行了研究。结果表明：４～６月各森林林下土壤各种养分含量均呈下降趋势，而且速度很快，是氮、磷、钾肥施用的适当时期；６～８月各种养分含量均比较稳定，变幅甚微，是土壤样品采集的适宜季节；８～１０月有效钾的含量上升，速效磷的含量继续下降，全氮变化不明显，有机质除栎林迅速下降外，其他林分基本平稳，８～１０月是补充土壤磷素的又一季节。土壤养分含量以次生栎林最高，毛竹林最低。
The dynamic characteristics of soil nutrient contents in undergrowths of Cunninghamia lanceolata, Pinus taeda, Quercus mongolica and Phyllostachys pubescens in the hilly area of southern Jiangsu Province were studied. The results showed that: from April to June, the soil nutrient contents of all forest forests showed a downward trend, and the speed was very fast, which was an appropriate period for the application of nitrogen, phosphorus and potassium fertilizers; The range of available potassium increased from August to October, the content of available phosphorus continued to decline, the change of total nitrogen was not obvious, the content of organic matter except the oak forest decreased rapidly, and the rest of the forest was stable. ~ October is another season to replenish soil phosphorus. Soil nutrient content is highest in secondary oak forest, moso bamboo forest lowest.