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Trade‐offs between fire hazard reduction and conservation in a Natura 2000 shrub‐grassland mosaic
Applied Vegetation Science ( IF 2.8 ) Pub Date : 2019-11-27 , DOI: 10.1111/avsc.12463
Vasco Silva 1 , Filipe X. Catry 1 , Paulo M. Fernandes 1, 2 , Francisco C. Rego 1 , Miguel N. Bugalho 1
Affiliation  

QUESTIONS: What are the effects of time since prescribed burning on plant species composition and diversity in a Natura 2000 shrub–grassland mosaic? Is it possible to use prescribed burning to reduce fire hazard and simultaneously maintain conservation status in such habitat types? LOCATION: Sintra‐Cascais Natural Park, Portugal. METHODS: We assessed differences in plant species composition, plant diversity, vegetation structure and above‐ground plant biomass between plots treated with prescribed burning (two, four and six years after fire) and untreated plots in a mosaic of Natura 2000 dry shrub–grasslands, and assessed potential fire behaviour differences between treatments. RESULTS: Plant species richness and diversity were higher two and four years after prescribed burning, in comparison with untreated plots. Cover of herbaceous species and non‐resprouters was higher, and cover of shrubs was lower, but only two years after fire. Habitat structure and phytovolume of the indicator species Ulex jussiaei was affected negatively up to six years after prescribed burning, indicating changes in conservation status from Favourable to Unfavourable. Prescribed burning reduced above‐ground biomass and fire simulations showed that potential fire hazard was also reduced, particularly in two‐year‐old plots. CONCLUSIONS: Prescribed burning increased plant diversity in the short term, reduced fuel loads and fire hazard, but negatively affected habitat conservation status. We show that there are potential trade‐offs between fire hazard mitigation and conservation in a Natura 2000 shrub–grassland habitat type and that these must be considered during fuel management decisions.

中文翻译:

在 Natura 2000 灌木草地马赛克中减少火灾危害和保护之间的权衡

问题:自规定燃烧后的时间对 Natura 2000 灌木-草地花叶植物物种组成和多样性有何影响?在这样的栖息地类型中,是否可以使用规定的燃烧来减少火灾危险并同时保持保护状态?地点:葡萄牙辛特拉-卡斯卡伊斯自然公园。方法:我们评估了 Natura 2000 干燥灌木-草地马赛克中经过规定燃烧(火灾后两年、四年和六年)处理的地块与未处理地块在植物物种组成、植物多样性、植被结构和地上植物生物量方面的差异。 ,并评估了处理之间的潜在火灾行为差异。结果:与未处理的地块相比,在规定的燃烧后两年和四年内,植物物种的丰富度和多样性更高。草本植物和非重生植物的覆盖率较高,灌木的覆盖率较低,但仅在火灾发生两年后。指示物种 Ulex jussiaei 的栖息地结构和植物体积在规定的燃烧后长达 6 年受到负面影响,表明保护状态从有利变为不利。规定的燃烧减少了地上生物量和火灾模拟表明,潜在的火灾危险也减少了,特别是在两年前的地块中。结论:规定的燃烧在短期内增加了植物多样性,减少了燃料负荷和火灾危险,但对栖息地保护状况产生了负面影响。
更新日期:2019-11-27
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