Monegi Piet, Mkhize Ntuthuko Raphael, Tjelele Julius Tlou, Ward David, Tsvuura Zivanai
Animal Production, Agricultural Research Council, Private Bag X 02, Irene 0062, South Africa.
School of Life Sciences, University of KwaZulu-Natal, Scottsville 3209, South Africa.
Plants (Basel). 2023 Sep 30;12(19):3451. doi: 10.3390/plants12193451.
Mechanical and chemical methods are widely used to control woody plant encroachment in many African countries. However, very little is known about the effectiveness of these control methods among woody species of different ages. We conducted a field experiment to determine the effects of different tree removal treatments (10%, 20%, 50%, 75% and 100%) and herbicide application (Picloram; 6 mL L) on the resprouting ability and vigour of 12 woody plant species. We examined 20 plots (30 m × 30 m) that were each subjected to tree removal, followed by herbicide application on half of the stems for each plot. All the tree species in this study resprouted after cutting. The applied concentration of herbicide significantly reduced the shoot production for , and , with a marginal effect for . The diameter of stems was an important factor in determining resprouting ability, with shoot production decreasing with increasing stem diameter. However, stem diameter did not affect shoot length and diameter for all species. We found that woody plants are more likely to resprout and survive as juveniles than as adults after cutting and that herbicide only affected four of the twelve species at a concentration of 6 mL L. Thus, testing the amount of Picloram needed to kill certain woody species may be of importance for land users in southern African savannas.
在许多非洲国家，机械和化学方法被广泛用于控制木本植物的入侵。然而，对于这些控制方法在不同年龄木本物种中的有效性，人们了解甚少。我们进行了一项田间试验，以确定不同树木砍伐处理（10%、20%、50%、75%和100%）以及除草剂施用（毒莠定；6毫升/升）对12种木本植物物种的萌蘖能力和活力的影响。我们考察了20个地块（30米×30米），每个地块都进行了树木砍伐，然后对每个地块一半的茎干施用除草剂。本研究中的所有树种在砍伐后都能萌蘖。施用的除草剂浓度显著降低了[物种名称1]、[物种名称2]和[物种名称3]的新梢产量，对[物种名称4]有轻微影响。茎干直径是决定萌蘖能力的一个重要因素，新梢产量随着茎干直径的增加而减少。然而，茎干直径对所有物种的新梢长度和直径没有影响。我们发现，木本植物在砍伐后作为幼树比作为成年树更有可能萌蘖并存活，并且在浓度为6毫升/升时，除草剂仅对12个物种中的4个有影响。因此，测试杀死某些木本物种所需的毒莠定用量对于南部非洲稀树草原的土地使用者可能很重要。
