Centro de Investigación Forestal-Lourizán, Consellería do Medio Rural e do Mar, Xunta de Galicia, P.O. Box 127, 36080 Pontevedra, Spain.
J Environ Manage. 2013 Mar 15;117:235-41. doi: 10.1016/j.jenvman.2013.01.004. Epub 2013 Jan 31.
Fuel reduction treatments are commonly used to reduce the risk of severe wildfire. However, more information about the effects on plant resprouting is needed to help land managers select the most appropriate treatment. To address this question, we evaluated the resprouting ability of five shrub species after the application of different types of fuel reduction methods (prescribed burning, clearing and mastication) in two contrasting shrubland areas in northern Spain. The shrub species were Erica australis, Pterospartum tridentatum and Halimium lasianthum spp. alyssoides, Ulex gallii and Erica cinerea. For most of the species under study (E. australis, P. tridentatum, H. lasianthum spp. alyssoides and U. gallii), neither plant mortality nor the number nor length of sprouted shoots per plant differed between treatments, although in E. cinerea the number of shoots was more negatively affected by prescribed burning than by clearing or mastication. The pre-treatment plant size did not affect plant mortality or plant resprouting response, suggesting that this parameter alone is not a good indicator of plant resprouting after fuel reduction treatments. Stem minimum diameter after treatments, a proxy of treatment severity, was not related to plant mortality, number or length of resprouted shoots. The duration of temperatures higher than 300 °C during burning in plant crown had a negative effect on the length of resprouted shoots, only in E. cinerea. The results show that fuel reduction treatments did not prevent shrub response in any case. Some reflections on the applicability of treatments are discussed.
减少燃料处理通常用于降低严重野火的风险。然而，需要更多关于植物再生影响的信息，以帮助土地管理者选择最合适的处理方法。为了解决这个问题，我们评估了五种灌木物种在西班牙北部两个对比灌木地区应用不同类型的减少燃料方法（规定燃烧、清理和粉碎）后的再生能力。研究的灌木物种为 Erica australis、Pterospartum tridentatum 和 Halimium lasianthum spp. alyssoides、Ulex gallii 和 Erica cinerea。对于大多数研究物种（E. australis、P. tridentatum、H. lasianthum spp. alyssoides 和 U. gallii），植物死亡率、每株植物发芽枝条的数量和长度在处理之间没有差异，尽管在 E. cinerea 中，规定燃烧比清理或粉碎更能影响枝条数量。处理前植物大小不影响植物死亡率或植物再生反应，这表明该参数本身并不是减少燃料处理后植物再生的良好指标。处理后茎的最小直径，代表处理的严重程度，与植物死亡率、发芽枝条的数量或长度无关。燃烧过程中植物冠层中高于 300°C 的温度持续时间对 E. cinerea 中再生枝条的长度有负面影响。结果表明，在任何情况下，减少燃料处理都没有阻止灌木的反应。讨论了一些关于处理适用性的思考。
