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首页> 外文期刊>Forest Ecology and Management >Post-burn vegetation development of rehabilitated bauxite mines in western Australia
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Post-burn vegetation development of rehabilitated bauxite mines in western Australia

机译：西澳大利亚州修复铝土矿的烧后植被发育

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Alcoa World Alumina Australia has been rehabilitating bauxite mines in the jarrah (Eucalyptus marginata) forest of Western Australia for more than 35 years. Mines rehabilitated in the early 1980s contain some eastern Australian eucalypts and have built up substantial fuel loads (23-35 t/ha) that may be reduced through prescribed burning. The aim of this study was to document vegetation changes in areas rehabilitated in the early 1980s for 6 years following prescribed burning and ascertain the most appropriate fire regime to apply in these areas to achieve identified rehabilitation completion criteria. Following both autumn and spring burning, rehabilitated areas rapidly re-accumulated fuel in the first year after burning, but fuel loads have remained relatively constant since then at a level of 8-9 t/ha. Burning was successful in removing dead aerated fuel that dominated the midstorey of the vegetation and stimulating plant growth in the understorey, making the burnt rehabilitated areas more like the unmined forest. Plant density, live plant cover, Acacia density and Acacia cover were generally higher following autumn than spring burning, although differences were reduced over time. Weed density did not differ significantly between autumn and spring burning, peaking 2 years after burning and then declining back to pre-burn levels. Similarly, species richness peaked in the first few years following burning and then declined, consistent with the predictions of the initial floristic composition model of succession. Tree growth was lower in burnt than unburnt areas for the first 2 years, but 4 and 6 years after burning tree growth was not significantly different between autumn, spring and no bum areas. Alcoa is required to integrate rehabilitated areas into the fire management regime of the surrounding jarrah forest to meet completion criteria. The results suggest that this can be achieved by burning rehabilitated areas containing non-native eucalypt species in spring under low to moderate intensity. This fire regime will lead to reduced fuel accumulation, a less prominent midstorey layer resulting from reduced recruitment of Acacia spp., lower densities of eastern Australian eucalypt species, and greater similarity in the composition and abundance of the understorey to the unmined forest.
机译：美铝世界氧化铝澳大利亚公司已经修复了西澳大利亚jarrah（Eucalyptus marginata）森林中的铝土矿，已有35多年的历史了。在1980年代初期恢复原貌的矿山中包含澳大利亚东部的一些桉树，并已积累了大量的燃料负荷（23-35吨/公顷），可通过规定的燃烧减少燃料负荷。这项研究的目的是记录在1980年代初期经过规定的燃烧后6年中恢复的地区的植被变化，并确定最合适的火情应用于这些地区，以达到确定的恢复完成标准。在秋季和春季燃烧之后，修复后的区域在燃烧后的第一年迅速重新积累了燃料，但此后燃料负荷一直保持相对稳定，为8-9吨/公顷。燃烧成功地消除了占主导地位的植被中层的枯死加气燃料，并刺激了下层的植物生长，使被烧毁的恢复地区更像未开采的森林。秋季之后，植物密度，活植物覆盖度，相思密度和相思覆盖度通常比春季燃烧更高，尽管随着时间的推移差异有所减小。在秋季和春季燃烧之间，杂草密度没有显着差异，在燃烧后2年达到峰值，然后又下降到燃烧前的水平。同样，物种丰富度在燃烧后的最初几年达到峰值，然后下降，这与演替的初始植物区系模型的预测一致。在最初的2年中，被烧毁的树木的生长低于未烧毁的区域，但是在被烧毁的树木生长后的4年和6年之间，秋季，春季和没有烧伤的区域之间的差异没有显着差异。美铝需要将修复后的地区纳入周围的jarrah森林的火灾管理制度中，以达到完工标准。结果表明，这可以通过在春季以低至中等强度燃烧包含非本地桉树物种的修复区来实现。这种火灾将导致燃料积聚减少，由于减少了金合欢属植物的吸收，较低的澳大利亚东部桉树树种的密度以及下层与未开采森林的相似度和丰度的增加，导致中层的突出程度降低。

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