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首页> 外文期刊>Restoration ecology >Restoration impacts on fuels and fire potential in a dryland tropical ecosystem dominated by the invasive grass Megathyrsus maximus
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Restoration impacts on fuels and fire potential in a dryland tropical ecosystem dominated by the invasive grass Megathyrsus maximus

机译：恢复对以入侵性草麦加锡罗非鱼为主的旱地热带生态系统中的燃料和火势的影响

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Ecological restoration often attempts to promote native species while managing for disturbances such as fire and non-native invasions. The goal of this research was to investigate whether restoration of a non-native, invasive Megathyrsus maximus (guinea grass) tropical grassland could simultaneously promote native species and reduce fire potential. Megathyrsus maximus was suppressed with herbicide, and three suites of native species—each including the same groundcover and shrub, and one of three tree species—were outplanted in a randomized, complete block design that also included herbicide control (herbicide with no outplantings) and untreated control treatments. Fuels were quantified 27 months after outplanting, and potential fire behavior (rate of spread and flame length) was modeled with BehavePlus. Compared with untreated controls, native outplant treatments reduced M. maximus cover by 76–91% and M. maximus live and dead fuel loads by greater than 92 and 68%, respectively. Despite reductions in M. maximus fuels, neither treatment-level (grass + native) total fuel loads and fuel moistures, nor modeled fire behavior differed between outplant treatments and controls. The best performing native woody species (Dodonaea viscosa) had significantly lower average individual plant live fuel moisture (84%) than M. maximus (156%) or other native woody outplant species (201–328%), highlighting the need for careful species selection. These results demonstrate that restoring native species to degraded tropical dry forests is possible, but that ecological restoration will not necessarily alter the potential for fire, at least in the short term, making selection of species with beneficial fuel properties and active fire management critical components of ongoing restoration.
机译：生态恢复通常试图促进本地物种的生长，同时应对诸如火灾和非本地入侵的干扰。这项研究的目的是调查恢复非原生入侵麦加锡大麦（几内亚草）热带草原是否可以同时促进本地物种和减少火灾的可能性。用除草剂抑制了最大甲thy（Megathyrsus maximus），并以随机，完整的块状设计（包括无除草剂的除草剂）将三套原生种（均包括相同的地被植物和灌木，以及三种树种之一）进行了种植。未经处理的对照治疗。移栽后27个月对燃料进行了量化，并使用BehavePlus对潜在的着火行为（扩散率和火焰长度）进行了建模。与未经处理的对照相比，原生外植体处理分别使最大分枝杆菌的覆盖率降低了76–91％，最大分枝杆菌的活体和死区燃料负载降低了92％和68％以上。尽管最大分枝杆菌的燃料减少了，但外植层处理和对照之间的处理水平（草+天然）总燃料负荷和燃料水分以及模拟的燃烧行为都没有差异。表现最佳的天然木本物种（Dodonaea viscosa）的单株活燃料平均水分含量（84％）明显低于最大分枝杆菌（156％）或其他天然木本外来物种（201–328％），这突出表明需要谨慎种植选择。这些结果表明，有可能将原生物种恢复到退化的热带干燥森林中，但是生态恢复并不一定会改变着火的可能性，至少在短期内如此，这使得选择具有有益燃料特性和积极火力管理关键物种的物种成为可能。正在进行的恢复。

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