【摘要】 笔者以不同树龄油松为研究对象,采用剖面挖掘与分层取样法,研究了2年生、3年生、4年生、5年生、6年生油松的根系。结果表明,随着树龄增大,根系在垂直方向上,随着深度增加分布范围变大;水平分布范围随深度变化不明显。在垂直方向上,根生物量随着土层深度的增加先增大后减小,呈现倒V的变化趋势;随着树龄增大,油松根系生物量显著增大。在0 cm～10 cm土层内,很少有细根;而在30 cm以下的土层内,只有细根和近似细根的根。2年生、3年生油松幼苗的根生物量主要分布在0 cm～20 cm土层内,4年生、5年生、6年生油松根生物量主要分布于0 cm～30 cm土层内。其中,土壤质地条件是影响根系分布的一个重要因素。更多还原

【Abstract】 The roots of Pinus tabulaeformis with different ages(2-year-old, 3-year-old, 4-year-old, 5-year-old, 6-year-old) were studied by using profile mining and stratified sampling method. Results showed that with the increase of tree age, the distribution range of root system increases in vertical direction, while the horizontal distribution range did not change significantly with depth. In the vertical direction, root biomass first increased and then decreased with the increase of soil depth which showed an inverted V trend. And root biomass of Pinus tabulaeformis increased significantly with the increase of tree age. There were few fine roots in 0 cm ～ 10 cm soil layer while there were only fine roots and approximately fine roots in the soil layer below 30 cm. The root biomass of 2-year-old and 3-year-old Pinus tabulaeformis seedlings mainly distributed in 0 cm ～ 20 cm soil layer, while the root biomass of 4-year-old, 5-year-old, 6-year-old Pinus tabulaeformis seedlings mainly distributed in 0 cm ～ 30 cm soil layer. Conditions of soil texture was an important factor of root system distribution.更多还原