The importance of topographic factors on the distribution of bog and heath in a Newfoundland blanket bog complex
The importance of topographic factors on the distribution of bog and heath in a Newfoundland blanket bog complex
复制标题
DOI：
10.1016/s0341-8162(99)00008-9
复制
发表时间：
1999-07-01
期刊：
影响因子：
6.2
通讯作者：
Price, JS
中科院分区：
文献类型：
--
作者：
Graniero, PA;Price, JS
人们普遍认为，覆盖沼泽的发展更多地受气候因素而非地形的影响，但尚未进行定量研究。这项研究的主要目的是定量评估地表和底层基质对沼泽复合体内沼泽和石南群落分布的地形影响的程度和性质。研究人员对纽芬兰阿瓦隆半岛东南叶的三个毯状沼泽地进行了研究。坡度、平面和剖面曲率以及上坡集水区等地形形状特征是从地表和矿物基质的数字高程模型 (DEM) 中得出的，并使用 Partition d'un Ensemble Geographique pour l'Analyse Spatiale Ecologique (PEGASE) 进行分析，这是一种基于信息论概念的程序。分析表明，地形约占所研究的覆盖沼泽复合体内沼泽和石南群落分布基础结构的 22%。此外，只有基质形态（代表泥炭堆积开始时的地形条件）强烈影响该地点目前的沼泽和石南格局。尽管低海拔地区更有利于沼泽的发展，但在地形有助于滞留水的高海拔地区，沼泽群落仍然存在。 (C) 1999 Elsevier Science B.V. 保留所有权利。
It is commonly assumed that the development of blanket bogs is governed more by climatic factors than by topography, but no quantitative studies have been undertaken. The primary aim of this research was to quantitatively assess the extent and nature of the topographic influence of both the surface and the underlying substrate on the distribution of bog and heath communities within a blanket bog complex. Three blanket bog sites on the southeastern lobe of the Avalon Peninsula, Newfoundland, were studied. Terrain shape characteristics such as slope, plan and profile curvature, and upslope catchment area were derived from digital elevation models (DEMs) of surface and mineral substrate, and analysed using Partition d'un Ensemble Geographique pour l'Analyse Spatiale Ecologique (PEGASE), a procedure based on concepts from information theory. The analysis showed that topography accounted for approximately 22% of the structure underlying the distribution of bog and heath communities within the blanket bog complexes studied. Furthermore, only substrate morphology, which represents the topographic conditions at the initiation of peat accumulation, strongly affected the present pattern of bog and heath at the sites. Although lower elevations were more favourable for bog development, bog communities persisted in upper elevations in areas where the topography assisted in detaining water. (C) 1999 Elsevier Science B.V. All rights reserved.