Environmental controls of plant species richness in riparian wetlands: Implications for restoration

Abstract

Wetland restoration projects often focus on mitigating losses of nutrients (nitrogen and phosphorus) toward downstream aquatic recipients and, so far, there is no clear guidance on how to restore environmental conditions to improve biodiversity values in the restored areas. However, to provide such guidance, it is necessary to obtain a better understanding of the factors driving biodiversity in natural wetlands. For this purpose, we investigated plant community characteristics in 35 plots located at 10 Danish riparian wetlands to identify critical factors required to sustain species diversity. We hypothesized that species richness is influenced by groundwater characteristics and nutrient availability and that threshold values for these environmental variables can be defined to characterize conditions needed to sustain high diversity plant communities, We found that high groundwater level (less than 37 cm depth) and low soil phosphorus content (<347 mu g cm(-3)) were two important drivers of plant species richness. Furthermore, at high groundwater and low soil phosphorus content, low nitrogen concentration in the groundwater also favors greater species richness. Our results imply that establishment of a groundwater table close to the soil surface and low nutrient availability are important factors for improving species richness in restored areas.

Keywords

Wetland restoration; Biodiversity; Vegetation; Rich fen; Nitrate; Hydrology; Phosphorus

Published in

Basic and Applied Ecology
2015, volume: 16, number: 6, pages: 480-489
Publisher: ELSEVIER GMBH, URBAN & FISCHER VERLAG

SLU Authors

• Audet, Joachim

  • Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences
    
  • Aarhus University

Global goals (SDG)

SDG14 Life below water
SDG15 Life on land

UKÄ Subject classification

Ecology

Publication identifier

• DOI: https://doi.org/10.1016/j.baae.2015.04.013

Permanent link to this page (URI)

https://res.slu.se/id/publ/75537