Scattered Faidherbia albida trees provide multiple ecological and production benefits across the Sahel. The intensive management and use of this important tree may impede its regeneration. Regeneration bottlenecks were explored and population dynamics modelled. On experimental plots in which seed of F. albida was sown, exposure to the first 2 months of dry season resulted in a quarter of seedling mortality. Exposure to season‐long free grazing and browsing caused significantly greater seedling mortality. Results from monitoring 100 permanent plots scattered over the landscape showed that adult population density was 4.2 ± 0.3 (mean ± SE) trees ha−1 and dominated by old age classes. Sixty percent of the total population were older than 30 years. The mean density for juveniles was 1.4 ± 0.2 (mean ± SE) individuals ha−1. The annual rates of decline were 1.2%, 51.3%, and 63.2% for adults, seedlings, and saplings, respectively. Our model predicted that the F. albida population will start to decline within 1–2 decades to eventually fall below 1 tree ha−1 within 60 years under current management. The model highlighted that the limited seed source, caused by excessive pruning, was the main constraint for recruitment. Appropriate land management policy to ensure adequate seed production would avert current trends in decline of F. albida population.

中文翻译：

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过度修剪和有限的再生导致埃塞俄比亚裂谷的 Faidherbia albida 种群下降

分散的 Faidherbia albida 树在整个萨赫勒地区提供了多种生态和生产效益。这种重要树的集约化管理和使用可能会阻碍其再生。探索了再生瓶颈并模拟了种群动态。在播种 F. albida 种子的试验田中，暴露于旱季的前 2 个月会导致四分之一的幼苗死亡率。暴露于长期的自由放牧和浏览导致幼苗死亡率显着增加。监测分散在景观中的 100 个永久地块的结果表明，成年人口密度为 4.2 ± 0.3（平均值 ± SE）树 ha−1，并且以老年群体为主。30 岁以上的人口占总人口的 60%。幼鱼的平均密度为 1.4 ± 0.2（平均值 ± SE）个体 ha-1。成虫、幼苗和幼苗的年递减率分别为1.2%、51.3%和63.2%。我们的模型预测 F. albida 种群将在 1-2 个十年内开始下降，最终在当前管理下的 60 年内降至 1 棵树 ha-1 以下。该模型强调，由于过度修剪造成的种子来源有限，是招募的主要制约因素。适当的土地管理政策以确保充足的种子生产将避免目前白色念珠菌种群下降的趋势。是招聘的主要制约因素。适当的土地管理政策以确保充足的种子生产将避免目前白色念珠菌种群下降的趋势。是招聘的主要制约因素。适当的土地管理政策以确保充足的种子生产将避免目前白色念珠菌种群下降的趋势。