桉树取代马尾松后土壤肥力变化研究

目的]了解桉树取代马尾松林后土壤肥力的变化。方法]采集广西柳州马尾松林及马尾松砍伐后种植桉树林下土壤，通过室内分析和比较，研究桉树取代马尾松后土壤肥力的变化。结果]桉树取代马尾松林后，土壤有机质、全N、全P、全K和速效K含量保持不变，碱解N和速效P含量有所提高，土壤pH有所改善。桉树林下土壤综合肥力没有降低，桉树生长后期土壤综合肥力反而有所提高。结论]桉树取代马尾松后，土壤肥力没有发生退化，桉树生长后期土壤综合肥力反而有所提高。

Research on the Variation of the Soil Fertility in the Garden of the Eucalyptus Forest Replacing Masson Pine

Objective] The change of the soil fertility in the forest land of the eucalyptus replacing the former——Masson pine was analyzed.Method] The soil sample from the forest land of Masson pine and from the forest land of eucalyptus that were planted in the same land of the former——Masson pine growing after they had been felled in Liuzhou city of Guangxi province was analyzed and compared in the soil fertility.Results] After the Masson pine was replaced with eucalyptus,the content of organic matter,total N,total P,total K and available K in the forest soil was same as before,however,the content of alkaline solution N and available P was increased and the pH value was also improved.The soil integrated fertility was not reduced and would be improved in the late period of eucalyptus forest growth.Conclusion] at the beginning that the Masson pine was replaced with eucalyptus there was no any variation in the soil fertility and the integrated fertility of soil in eucalyptus forest would be improved in later.