落叶松人工林土壤主要营养元素时空变异

运用经典统计学方法,对东北林业大学哈尔滨实验林场落叶松人工林林地土壤主要营养元素时空变异进行研究。研究结果表明,随林龄的增加,土壤全N、全P、C元素含量及pH值均较1983年的观测值下降;C元素和pH值呈现随深度增加先增加后减小的变化趋势;全N呈现出随深度增加先减小后增加的变化趋势,水解性N表现出与全N相近似的变化趋势;全P呈现随深度增加而增加的变化趋势,速效P则表现为随深度增加先减小后增加的变化趋势;全K与速效K在深度方向上无显著变化;除C元素随观测月份的增加表现出积累作用外,其他各项土壤营养元素均表现出生长旺盛月份含量（或值）较低,其他月份含量（或值）较高的变化趋势;观测期内除pH值为弱变异外,其他各营养元素仅为中等变异,林地土壤均质性较好。

The Spatial and Temporal Variability of Soil Main Nutrient Contents in Larix gmelini Rupr Plantation

The spatial and temporal variability about soil main nutrient contents under Larix gmelini Rupr plantation in Harbin Experimental Forest Farm of Northeast Forestry University were studied by classical statistics method. The results showed as follows： with the increase of the stand age, total N, total P, C content and pH decrease compared to those in 1983. C content and pH firstly increase and then decrease with depth increasing. Total N firstly decreases and then increases with depth increasing, and hydrolysis N has the same change tendency. Total P increases with depth increasing, and available P firstly decreases and then increases with depth increasing. Total K and available K have no significant changes with depth increasing. Besides C content increases with the increase of month, other nutrient contents or values are low in vigorous growth season and high in other seasons. During the observation period, besides pH shows weaker variation, others are medium variation, and soil has better heterogeneity.