Department of Biological and Environmental Science, PO Box 35, University of Jyväskylä, 40014 Jyväskylä, Finland.
J Environ Manage. 2011 Oct;92(10):2539-46. doi: 10.1016/j.jenvman.2011.05.019. Epub 2011 Jun 12.
Habitat loss is one of the greatest threats for biodiversity. In Finland, two thirds of natural mires have been drained for silviculture, which transforms open wetlands into dense forests. However, vegetation management of power line rights-of-way (ROW) maintain the drained mires as open areas. The aim of this study was to determine the effect of the power line ROW vegetation management on butterfly abundance, species richness and community structure by comparing the managed power line ROWs to unmanaged drained control sites and to natural mires. The species richness or abundance of mire butterflies did not differ between the power line ROWs and natural mires. In contrast, both species richness and abundance of butterflies was low on the unmanaged control sites. Tree canopy cover had a negative effect on mire butterflies and this is most likely related to changes in microclimate. The results indicate that the active vegetation removal in the power line ROWs maintain alternative habitats for mire butterflies; yet, the power line ROWs cannot substitute the natural mires.
生境丧失是生物多样性面临的最大威胁之一。在芬兰，三分之二的天然泥煤地已被排干用于造林，这将开阔的湿地变成了茂密的森林。然而，输电线通道（ROW）的植被管理将排干的泥煤地保持为开阔区域。本研究的目的是通过将管理的输电线 ROW 与未管理的排干对照点和天然泥煤地进行比较，确定输电线 ROW 植被管理对蝴蝶丰度、物种丰富度和群落结构的影响。泥煤地蝴蝶的物种丰富度或丰度在输电线 ROW 和天然泥煤地之间没有差异。相比之下，未管理对照点的蝴蝶物种丰富度和丰度都较低。树冠覆盖对泥煤地蝴蝶有负面影响，这很可能与微气候的变化有关。结果表明，输电线 ROW 中的积极植被清除为泥煤地蝴蝶维持了替代生境；然而，输电线 ROW 不能替代天然泥煤地。
