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采用根钻法对低覆盖度行带式栽植模式下赤峰杨的根长密度的空间分布特征进行了研究,同时用烘干法对其根质量密度进行了测量。结果表明:赤峰杨的总平均根长密度在不同土层间变化很大,0.0 40 cm土层为根系主要分布区域,其在总平均根长密度中所占比例高达77.1%;不同径级之间的根长密度差异显著,0.0 0.2 mm径级根系的根长密度最大,可达0.61 cm·cm-3。带间根长密度变化出现了先增大后减少而后略有增大的趋势,环境因子影响根系分布,>2.0 mm的粗根根长密度主要分布于带间。低覆盖度行带式配置模式下的赤峰杨吸收根系(<2mm)主要分布于0 40 cm深度区域,粗根(>2.0 mm)主要分布于地表40 cm以下区域,带间是根系的主要分布区域,根系主要利用的是天然降水。
The root length method was used to study the spatial distribution characteristics of root length density of Chifeng Poplar under low coverage with low coverage. The root mass density was measured by drying method. The results showed that the total average root length density of Chifeng chinense varied greatly among different soil layers. The 0.040 cm soil layer was the main distribution area of root, which accounted for 77.1% of the total root length density. There was significant difference in the root length between the two groups. The root length density of 0.0 0.2 mm diameter roots was the highest, reaching 0.61 cm · cm-3. The change of root length density between the two bands tended to increase at first and then decrease slightly and then increase slightly. The environmental factors affected the root distribution, and the root length density of coarse roots> 2.0 mm was mainly distributed between bands. The root absorption zone (<2mm) of Chifeng Yang with low coverage and horizontal distribution was mainly distributed in the depth of 0 40 cm, and the root (> 2.0 mm) distributed mainly in the area below 40 cm on the ground, with the main distribution of roots Region, the main use of the root system of natural precipitation.