萨凡纳树木物种的重新发芽反应与树干大小,木材清除强度和除草剂应用有关
Piet Monegi1,2, Ntuthuko Raphael Mkhize1,3, Julius Tlou Tjelele1
1Animal Production, Agricultural Research Council, Private Bag X 02, Irene 0062, South Africa.
Plants (Basel, Switzerland)
|October 14, 2023
概括
在非洲使用机械和化学方法对木质植物进行控制,其有效性各不相同. 年轻植物比成年植物更容易重新发芽,像Picloram这样的除草剂只影响了少数物种.
科学领域:
- 生态生态学 生态生态学
- 植物学 植物学
- 环境科学 环境科学
背景情况:
- 森林植被侵占非洲大草原带来了挑战,需要有效的控制策略.
- 目前的机械和化学控制方法在不同树木物种和年龄的有效性仍然不充分理解.
研究的目的:
- 评估不同树木砍伐强度和皮克洛拉姆除草剂的应用对12种非洲木质物种的再生长能力的影响.
- 为了确定干径和植物年龄 (青春期与成年期) 对对照治疗后再生长成功的影响.
主要方法:
- 实地实验涉及20个地块 (30米×30米),采用树木移除处理 (10-100%) 和选择性皮克洛拉姆应用 (6毫升L-1).
- 对12种木质物种的重新发芽能力,发芽量,茎直径,发芽长度和发芽直径的评估.
主要成果:
- 所有12个物种在切割后都重新发芽,年轻植物比成年植物具有更高的再生能力.
- 皮克除草剂显著降低了Ehretia rigida,Vachellia robusta和Ziziphus mucronata的发芽量,对Dichrostachys cinerea的影响很小.
- 茎直径与发芽产量有负相关性,但没有影响发芽的长度或直径.
结论:
- 机械去除和Picloram应用的有效性有限,特别是在成年木质植物和大多数测试物种上.
- 了解物种特异性反应和植物年龄的作用对于优化非洲草原木质植物管理至关重要.
- 为了有效地管理土地,建议对特定木质物种的最佳度进行进一步的研究.
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