中文摘要：

采用空间代替时间的方法,构建了不同栽培林龄和轮次的杨树人工林试验样地,测定了土壤主要物理化学性质。结果表明,不同栽培轮次土壤密度值表现为1轮11年生〉2轮9年生,随着林龄增加,土壤密度呈逐渐下降趋势,表现为2轮3年生〉2轮6年生〉2轮9年生,且各样地之间呈显著差异;土壤饱和持水量、毛管持水量、毛管孔隙度和总孔隙度在各样地之间的变化无明显差异,而土壤非毛管孔隙度的变化则呈显著差异,在不同林龄样地上呈极显著差异。试验结果还显示,表层0～10cm土壤中各养分元素的含量都对应地高于10～30cm土层的含量,而pH值则呈相反的变化趋势;在不同栽培轮次和林龄的杨树人工林样地上对应土层土壤养分元素无明显的变化规律。

英文摘要：

Experiment plots of poplar plantation with different stand ages and rotations were structured by using ＂space re- placing time＂ method to measure the soil physical and chemical properties. The results showed that soil bulk density of the 6-year-old stands of the first-rotation poplar plantation was higher than that of the 9-year-old stands of the second-rotation poplar plantation. With the second-rotation stand age increase, soil bulk density decreased gradually as follows ： the 3-year- old stands 〉 the 3-year-old stands 〉 the 3-year-old stands. And there was significant difference among the second rotation poplar plantation experiment plots. The soil saturated water capacity, capillary water capacity, capillary porosity and total porosity were all no obvious differences among the all experiment plots. While the change of the soil non-capillary porosity was dear, especially among the plots of different stand age of second-rotation. The results also displayed that all nutrient elements were higher in the 0-10 cm soil layer than that in the 10-30 cm soil layer, while pH change showed the opposite tendency. There was no change law of 0-10 cm or 10-30 cm soil layer in experiment plot of poplar plantation.