张北坝上地区杨树萌芽更新规律研究

Study on the law of sprouts regeneration of Populus stumps in Bashang area of Zhangbei county

为了对坝上地区退化杨树防护林进行更新改造,对张北小二台镇杨树皆伐迹地伐桩萌生条的生长状况进行了调查,以探究其更新规律。研究结果表明:在所调查的伐桩直径范围内,萌生条数量与伐桩直径呈显著的正相关关系;萌生条直径与伐桩直径无显著相关关系,而与萌生条数量及竞争指数存在显著的负相关关系;萌生能力综合指标与伐桩直径之间存在极显著的正相关关系(P<0.01),伐桩直径越大,其萌生能力越强。在张北坝上地区退化杨树防护林的改造中,可充分利用衰退杨树伐桩的萌蘖能力进行更新,并通过萌条数量的控制对萌条的生长进行调节,以形成生长迅速、长势良好的植株。

In order to renovate and transform the degenerated Populus shelterbelts in the area of Bashang, the stumps growth status of Populus clear cut land in Xiaoertai town of Zhang bei county were investigated to explore the law of sprouts regeneration of Populus stumps. It was shown there was a significant positive correlation between the sprout number and the stump diameter within the scope of the investigated stump diameter. The sprout diameter had no significant influence on the stump diameter, but had a significant negative correlation with the sprout number and competition indices. There was a very significant positive correlation between the sprouting ability comprehensive indices and the stump diameter （P〈0. 01）, the larger diameter of stump, and the stronger sprouting ability. Sprouting ability should be used for the transformation of degraded poplar shelter forests in the Zhang bei Bashang region, and the number of sprouts should be regulated to improve the growth statue of poplar sprouts.