灌溉方式对杨树人工林细根分布特征的影响
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国家重点研发计划课题“欧美杨工业资源材高效培育技术研究”(2016YFD0600401)


Effects of Irrigation Methods on Fine Root Distribution of Poplar Plantations
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    [目的] 探究滴灌对北京市大兴区林场5—6年生欧美107杨树人工林细根分布的影响,为干旱沙地条件下营建人工林提供理论支持。[方法] 采用根钻取样法,对比滴灌和常规灌溉条件下细根生物量在不同方向、不同水平距离和不同土层深度的差异。[结果] 滴灌没有改变细根的空间分布格局,细根在水平方向的距树干50 cm内,垂直方向的0—40 cm土层集中分布,不同方向的细根分布表现为:株间>对角>行间。滴灌对细根生长和分布的影响受滴灌后形成的湿润带范围影响,株间方向细根生物量在水平和垂直方向的分布特征与对角和行间方向差异明显,湿润带范围内细根生物量均与常规灌溉差异极显著(p<0.01)。[结论] 滴灌条件下的杨树人工林较常规灌溉有更多的细根分布,可以更充分利用地下资源,促进林木生长,提高林地生产力。

    Abstract:

    [Objective] The effects of drip irrigation on the distribution of fine roots of five and six years old "107" poplar clones (Populus×euramericana "Neva") in Daxing District forest farm in Beijing City was investigated in order to provide theoretical support for plantation construction under arid sandy land conditions.[Methods] Differences in fine root biomass in different directions, different horizontal distances, and different soil depths due to drip irrigation compared with conventional irrigation were determined from root samples collected by drilling.[Results] The spatial distribution pattern of fine roots was not changed by drip irrigation. Within 50 cm from the trunk (in the horizontal direction), and within the 0-40 cm soil layer (in the vertical direction), fine roots were distributed intensively. In different directions, fine roots were distributed in the following order:between plants > diagonal direction > between rows. Growth and distribution of fine roots were mainly affected by the range of the wetting zone of drip irrigation. The distribution of fine root biomass in the inter-plant direction was significantly different from the diagonal direction and the inter-row direction. The biomass of fine roots under drip irrigation was significantly different from the biomass under conventional irrigation (p<0.01).[Conclusion] There were more fine roots in poplar plantations under drip irrigation than under conventional irrigation. The increased number of fine roots can make full use of underground resources, promote the growth of trees, and improve forest land productivity.

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秘洪雷,秦杏宇,兰再平,彭晶晶,马鑫.灌溉方式对杨树人工林细根分布特征的影响[J].水土保持通报,2021,41(5):23-29

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  • 收稿日期:2021-04-16
  • 最后修改日期:2021-06-09
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  • 在线发布日期: 2021-10-25