Coastal dune topography as a determinant of abiotic conditions and biological community restoration in northern KwaZulu-Natal, South Africa
Coastal dune topography as a determinant of abiotic conditions and biological community restoration in northern KwaZulu-Natal, South Africa
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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
DOI：
10.1007/s11355-013-0211-1
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发表时间：
2013
影响因子：
2
通讯作者：
R. Aarde
中科院分区：
文献类型：
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作者：
Theresia Ott;R. Aarde
地形很少被认为是一个独立的目标恢复。然而，地形决定了微环境条件，从而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。我们的目的是建立地形的相对重要性，在那里被采矿破坏的沿海沙丘重建作为恢复计划的一部分。我们评估了（1）小气候和土壤条件，（2）木本植物和千足虫物种丰富度和密度，特定位置的地形剖面的响应。我们列举了地形剖面沙丘形态（方面，海拔和梯度），以及相对位置的沙丘（波峰，坡度和山谷）的变量。温度、相对湿度和光照强度随坡向、海拔、坡度和位置而变化。然而，更新年龄是一个更好的预测土壤养分有效性比这些地形变量。年龄也与地形变量相互作用，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）的密度是最好的解释地形变量单独。这些新生长的沿海沙丘森林的短暂性可能掩盖了地形对社区的影响，因为与年龄有关的演替（增加结构复杂性）推动了生物群落的建立和持久性，而不是受地形调节的生境条件。然而，我们的研究表明，与地形变化相关的微生境影响专业物种比通才。
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.
Ayabe,T.,Takenaka,H.et al.：“人腺苷酸激酶 N 端区域和 C 端区域的定点随机替换。”
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