不同林龄日本落叶松人工林土壤化学性质的变化∗

摘要

For understanding the dynamics of soil chemical properties of Larix kaempferi plantation, taking Larix kaempferi plantations at different ages in Jianshi Changlinggang of Hubei province as research object, several soil chemical indicators such as pH, organic matter, alkaline hydrolysis N, effective P, and available K were com-prehensively analyzed. The result showed that: with the increase of soil depth, the soil pH increased but soil nu-trients decreased gradually at same forest age; with the increase of forest age, the soil pH decreased at the begin-ning and then increased. Correlation analysis showed that the correlation among different soil chemical indicators were significantly, except that there was no significant correlation between soil effective P and other chemical indi-cators. This study shows that the introduction of Larix kaempferi significantly reduces the local soil pH, the soil or-ganic matter and alkaline hydrolysis N content are very rich, but the effective P and the available K content is rela-tively insufficiency.%为研究日本落叶松人工林土壤化学性质的变化规律，对湖北建始长岭岗林场不同林龄的日本落叶松人工林土壤的pH值、有机质、碱解N、有效P、速效K等指标进行了综合分析。结果表明，随土层深度的增加，同一林龄土壤pH值逐渐升高，土壤养分逐渐降低；随林龄的增加，同一土层土壤pH值先降低后升高，土壤养分变化有一定的波动性。相关性分析表明，除土壤有效P与其他化学指标相关关系不显著外，其他指标间相关关系显著。本研究结果表明日本落叶松的引入显著降低了当地土壤的pH值，其土壤有机质、碱解N含量很丰富，有效P、速效K含量相对缺乏。