落叶松人工林的土壤理化性质

为探讨落叶松人工林土壤因子的变化规律，采用标准地取样，室内常规分析的方法，测定了不同林龄的落叶松人工纯林、阔叶林、原始红松林下土壤的理化性质。研究结果表明：落叶松人工林下土壤密度增大，孔隙度减少，毛管持水量明显增高，通气性能减弱；随着林龄的增大，土壤有机质含量降低，养分含量下降；土壤质地和土壤酸度变化不显著；但阳离子代换量变低，土壤保肥、供肥能力相对减弱，落叶松人工林的潜在地力呈现衰退趋势

Physical and Chemical Properties of the Soil for Larch Plantations

The physical and chemical properties of the soil in pure larch plantations of different ages, broad-leaved forest and natural Korean pine forest were measured by standard-plot sampling and normal lab analysis. Results of the research show that the soil volume weight of the larch plantation was increased; the soil's porosity was decreased; the water-keeping ability of its capillaries was obviously increased; its aeration was weakened; with the increasing of the stand age, the soil organic material content and its nutrient content became lower, its texture and acidity were not significantly changed; its cation exchange became less, and its ferilizer keeping and supplying ability was comparatively weakened. The potential productivity of the soil of the Larch plantations has the tendency of deterioration.