不同类型红松林土壤基础肥力特征分析

通过实地调查与对比试验,对红松人工纯林、人工混交林和天然林3种林分不同土层的土壤养分状况进行了分析和研究。结果表明,不同林分的土壤养分含量差异较大,随着土层深度的增加,3种林分的土壤养分含量均出现逐渐下降的趋势。土壤有机质含量、全量养分含量和速效养分含量均在0—15cm土层中达到最高值。其中红松天然林最高,依次为红松人工混交林和红松人工纯林。3种林分中钾素含量比较丰富,全磷含量维持在较低水平,土壤pH值下降缓慢。红松人工纯林土壤有酸化趋势,pH值在5.08～5.37。因此,红松人工纯林应及时进行更新,以防止土壤环境的恶化。

An Analysis of Characteristics of Soil Basic Fertility in Different Types of Pinus Koraiensis Forests

Through field investigation and experiment analysis,the soil nutrient status under three types of forests including artificial pure forest,mixed forest and natural forest of Pinus koraiensis and at different levels are analyzed.Results showed that there was significant difference among the nutrients in different forest types.For the same forest type,the nutrients all declined with the increase of soil depth,and the organic matter content as well as the total and available contents of nutrients reached highest value in soil layer of 0—15 cm.As a whole,the nutrients in natural forest of Pinus koraiensis were highest,followed by mixed forest and pure forest.In the three forest types,the kalium content was rich and the total phosphorus content maintained a low level.The pH value declined slowly and the soil in pure forest of Pinus koraiensis had an acidification trend,with pH values ranging from 5.08 to 5.37.Therefore,regeneration in pure forest of Pinus koraiensis should be carried out in time to reduce and prevent soil nutrient loss.