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标题：New Insights into Factors Controlling Drainage Density in Subarctic Landscapes
其他标题：New Insights into Factors Controlling Drainage Density in Subarctic Landscapes
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作者：Miska Luoto
期刊名称：Arctic, Antarctic, and Alpine Research
印刷版ISSN：1523-0430
电子版ISSN：1938-4246
出版年度：2007
卷号：39
期号：1
页码：117-126
DOI：10.1657/1523-0430(2007)39[117:NIIFCD]2.0.CO%3B2
摘要：Fluvial processes play a crucial role in landscape development in periglacial regions. Geomorphological studies have yielded contrasting inferences about the importance of various environmental factors to drainage density. In this paper, 12 explanatory variables, based on relief, vegetation, soil, and rock type, were used to explain the controlling factors of drainage density in an area of 2880 km 2 in subarctic Finland. Analyses were performed at multiple spatial scales (1, 4, 16, and 64 km 2 ) based on two novel statistical methods, namely generalized linear modeling (GLM) and hierarchical partitioning (HP). The results of the GLM and HP analyses were broadly concordant. Most of the variation in drainage density can be explained by soil and vegetation variables. Drainage density increased with proportion of rock and gravel soils and alpine vegetation, and decreased with peat cover. Variables based on topography and rock type explained only a small amount of the variation in drainage density. The results also confirm the profound influence of the spatial scale on the geomorphologic systems: factors influencing drainage density yield different results depending on the spatial scale at which drainage density is analyzed. The large data sets and the use of rigorous statistical techniques at four different scales add the confidence and generality for the present results.