大叶栎、火力楠人工林土壤肥力研究

Soil Fertility of Castanopsis fissa and Michelia macclurei

为了研究大叶栎(Castanopsis fissa)、火力楠(Michelia macclurei)人工林地土壤水分、肥力差异,比较它们对土壤的改良作用。以相似的立地条件、相同的林龄(12年)的大叶栎(Castanopsis fissa)、火力楠(Michelia macclurei)人工林根际土壤为研究对象,分别采用国家标准局发布的《森林土壤分析方法》中环刀法和相应的土壤养分分析方法测定土壤水分和土壤有机质、氮、磷、钾含量,结果表明:大叶栎人工林的持水量和孔隙度均大于火力楠人工林,土壤容重小于火力楠人工林,差异不显著;土壤全量和速效氮、磷、钾含量以及土壤有机质含量的测定结果均是大叶栎人工林较火力楠人工林高,其中全钾和速效钾含量差异显著,其他养分含量差异不显著。表明大叶栎人工林具有更好的保水、供肥能力。

To study the soil water and fertility of Castanopsis fissa and Michelia macclurei and compare their effects on soil improvement, taking rhizosphere soil of Castanopsis fissa and Michelia macclurei plan-tations in a similar site condition and the same forest age （12a） as object, using Ring Sampler Method and appropriate soil nutrient analysis referring Forest Soil Analysis Methods published by the National Bu-reau of Standards, soil water, soil physical properties and the content of organic matter, N, P, and K were measured. The results showed that water holding capacity and porosity in Castanopsis fissa plantation were higher than Michelia macclurei, and bulk density was less. The difference was not significant. Soil total and available N, P, K and organic matter were higher in Castanopsis fissa plantation than Michelia macclurei. The differences of total P and available P were significant. Others were not significantly differ-ent. This study showed that soil holding capacity and fertility were higher in Castanopsis fissa plantation.