A study on the effect of bush control methods on encroaching woody species, namely Acacia drepanolobium, Acacia mellifera and Acacia reficiens was conducted for a 2 years’ time. A 3 ha of land was divided into two plots. Each replication with an area of 300 m × 50 m was again sub-divided into six plots (each 50 m × 50 m) to accommodate six treatments. Bush control treatments were assigned randomly to the plots and replicated two times across sites of similar topography. During the post-treatment period, responses of woody species to different treatments in terms of mortality and coppicing were monitored. Data was analysed using R software and Tukey’s studentized range tests for comparisons of means. The applied treatments significantly influenced (P < 0.05) encroaching woody species. The finding showed that five out of the six bush control treatments greatly promoted woody mortality, however with species-specific differences. The stem-burning, tree cutting with fire–browse combination, cutting and fire, cutting and browsing, and cutting treatments greatly increased species mortality compared to the control treatment. Responses due to treatment effect also varied significantly (P < 0.05) among encroaching woody species. Accordingly, mortality was higher in A. reficiens than in the other two species, indicating that A. reficiens is greatly susceptible to the applied treatments. The significant finding was that woody species exhibited greater mortality in response to selective cutting/thinning and post-management techniques. Post-thinning management measures would sustain savanna ecology, if implemented at certain intervals.

中文翻译：

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埃塞俄比亚南部博拉纳牧场的灌木丛控制方法对木本植物侵占和死亡的影响

进行了2年的研究，研究了灌木控制方法对入侵相思木种的影响，这些木本植物包括金合欢，蜜蜂和胶木。将3公顷的土地分为两块。每个面积为300 m×50 m的复制品再次细分为六个样地（每个50 m×50 m），以容纳六种处理方式。布什对照处理被随机分配到样地，并在类似地形的地点重复两次。在后期处理期间，监测了木本植物对不同处理方法的死亡率和交配行为的反应。使用R软件和Tukey的学生化距离测试分析数据，以比较均值。施用的处理显着影响（P <0.05）侵蚀木本物种。该发现表明，在六种灌木丛防治方法中，有五种极大地提高了木本植物的死亡率，但是有种间差异。与对照处理相比，进行茎秆燃烧，用火与火结合的树木砍伐，砍伐和砍伐，砍伐和浏览以及砍伐等处理方法大大增加了物种死亡率。在侵蚀的木本植物中，由于处理效果引起的响应也有显着差异（P <0.05）。因此，A。reficiens的死亡率高于其他两个物种，表明A. reficiens非常容易受到所应用的处理。重大发现是，对选择性砍伐/稀化和后期管理技术而言，木本物种的死亡率更高。如果在一定间隔内实施，稀疏后管理措施将维持热带稀树草原的生态。