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首页> 外文期刊>Landscape and ecological engineering >Coastal dune topography as a determinant of abiotic conditions and biological community restoration in northern KwaZulu-Natal, South Africa
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Coastal dune topography as a determinant of abiotic conditions and biological community restoration in northern KwaZulu-Natal, South Africa

机译:沿海沙丘地形是南非夸祖鲁-纳塔尔省北部非生物条件和生物群落恢复的决定因素

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摘要

Topography is rarely considered as an independent goal of restoration. However, topography determines microenvironmental conditions and hence living conditions for species. Restoring topography may therefore be an important first step in ecological restoration. We aimed at establishing the relative importance of topography where coastal dunes destroyed by mining are rebuilt as part of a rehabilitation program. We assessed the response of (1) microclimatic and soil conditions, and (2) woody plant and millipede species richness and density, to location-specific topographic profiles. We enumerated the topographic profile using variables of dune morphology (aspect, elevation, and gradient) as well as relative position on a dune (crest, slope, and valley). Temperature, relative humidity, and light intensity varied with aspect, elevation, gradient, and position. However, regeneration age was a better predictor of soil nutrient availability than these topographic variables. Age also interacted with topographic variables to explain tree canopy density and species richness, as well as millipede species richness. The density of keeled millipedes (forest specialists) was best explained by topographic variables alone. The transient nature of these new-growth coastal dune forests likely masks topography-related effects on communities because age-related succession (increasing structural complexity) drives the establishment and persistence of biological communities, not habitat conditions modulated by topography. However, our study has shown that the microhabitats associated with topographic variability influence specialist species more than generalists.
机译:地形很少被视为恢复的独立目标。但是,地形决定了微环境条件,因此决定了物种的生存条件。因此,恢复地形可能是生态恢复的重要第一步。我们旨在确定地形的相对重要性,在该地形中,被采矿破坏的沿海沙丘将作为恢复计划的一部分进行重建。我们评估了(1)小气候和土壤条件,以及(2)木本植物和千足虫物种的丰富度和密度对特定位置地形的响应。我们使用沙丘形态变量(纵横比,高程和坡度)以及沙丘上的相对位置(波峰,坡度和山谷)来枚举地形图。温度,相对湿度和光强度随外观,高度,坡度和位置而变化。但是,再生年龄比这些地形变量更好地预测了土壤养分的利用率。年龄还与地形变量相互作用,以解释树冠密度和物种丰富度以及千足虫物种丰富度。龙骨千足虫(森林专家)的密度最好仅靠地形变量来解释。这些新近生长的沿海沙丘森林的短暂性质可能掩盖了地形对社区的影响,因为与年龄相关的演替(结构复杂性不断提高)驱动着生物群落的建立和持久性,而不是地形所调节的栖息地条件。但是,我们的研究表明,与地形变异相关的微生境对专家物种的影响要大于通才。

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