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Ecosystems : Volume 8, Issue 3, April 2005

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Plant Species Numbers Predicted by a Topography-based Groundwater Flow Index

Content Provider	Springer Nature Link
Author	Zinko, Ursula Seibert, Jan Dynesius, Mats Nilsson, Christer
Copyright Year	2005
Abstract	The lack of a clear understanding of the factors governing the often-great variation of species numbers over entire landscapes confounds attempts to manage biodiversity. We hypothesized that in a topographically variable boreal forest landscape the availability of shallow groundwater is a major determinant of plant species numbers. We then developed a topographically derived hydrologic index based on multidirectional flow algorithms to account for the variation in availability of such groundwater in the landscape. We found a positive correlation between species numbers of vascular plants in plots ranging from 0.01 to 200 m2 and the hydrologic index. Generally, the landscape was relatively dry and species-poor, but interspersed patches with shallow groundwater had high species numbers and high proportions of regionally uncommon plant species. The index explained 30% of the variation in vascular plant number and correlated quite well (rs = 0.50) with groundwater level, but not as well with a community H+ concentration value (instead of community pH, rs = −0.31), based on species composition. In addition, we found a very strong correlation between species number and the community H+ concentration value (rs −0.84). The hydrologic index is a useful tool for the identification of spatial of species number patterns across entire landscapes. This is an important step in identifying the areas most in need of protection or restoration, designing survey techniques, and understanding the fundamental processes that control the spatial distribution of species.
Starting Page	430
Ending Page	441
Page Count	12
File Format	PDF
ISSN	14329840
Journal	Ecosystems
Volume Number	8
Issue Number	4
e-ISSN	14350629
Language	English
Publisher	Springer-Verlag
Publisher Date	2005-06-28
Publisher Place	New York
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	species richness wetness index boreal forest vascular plants slope nestedness scale dependence Ecology Plant Sciences Zoology Environmental Management Geoecology/Natural Processes Nature Conservation
Content Type	Text
Resource Type	Article
Subject	Ecology Environmental Chemistry Ecology, Evolution, Behavior and Systematics

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