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首页> 外文期刊>Ecological management & restoration >Poor recovery of woody vegetation on sand and gravel mines in the Darwin region of the Northern Territory
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Poor recovery of woody vegetation on sand and gravel mines in the Darwin region of the Northern Territory

机译：北领地达尔文地区沙子和砾石矿山上的木质植被恢复不佳

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摘要

Sand sheets near Darwin support a distinct heathland vegetation type which includes the habitat of several threatened species. Sand and gravel are extracted from shallow mines in this region. Woody vegetation recovery in 31 small, shallow former sand or gravel mine sites near Darwin that were up to 27 years old was assessed and compared to paired unmined control sites. Recovery in vegetation structure within each mine was calculated as the percentage of that in the control site. Mined sites recovered about 50% of their stem count and canopy cover, but only about 10% of basal area and mature tree count. Gravel mines showed poorer recovery than sand mines. Time since mining had no significant effect on the extent of recovery, but deeper mines had significantly poorer recovery. Only 35% of woody species in sand controls were present in mine sites, and 41% of gravel control species were present in former mine sites. It is unlikely that recovery will significantly improve in coming decades. Sand mining affects about 40 ha of land per year in this region, but is likely to increase in the future. If Darwin expands to a population of 1 million people, and mine sites are not fully rehabilitated, all of the sand-sheet vegetation in the region could be removed in the next 100 years. Improved rehabilitation and protection is crucial for the conservation of heathland vegetation in this region.
机译：达尔文附近的沙层支持独特的荒地植被类型，其中包括几种濒危物种的栖息地。砂和砾石是从该地区的浅矿中提取的。评估了达尔文附近长达31年的31个小型浅层前沙性或砾石矿区的木质植被恢复情况，并将其与成对的未开采对照点进行了比较。计算每个矿井中植被结构的恢复率，以其在控制地点的恢复率来计算。采掘地恢复了其茎数和冠层覆盖率的约50％，但仅恢复了其基础面积和成熟树数的10％。砾石矿山的恢复能力比砂矿差。自开采以来的时间对恢复程度没有重大影响，但较深的地雷则具有较差的恢复能力。防沙区中只有35％的木本物种存在于矿区，而砾石防除物种中则有41％存在于以前的矿区。在未来几十年内，复苏不太可能显着改善。采砂每年影响该地区约40公顷土地，但将来可能会增加。如果达尔文人口增加到100万人，并且矿场未得到充分修复，那么该地区所有的沙土植被将在未来100年内被清除。改善的恢复和保护对于保护该地区的荒地植被至关重要。

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