Chemistry 2011.org
Chemistry2011.org
All About Chemistry... 2011 and beyond

Related Stories

Where are the hotspots of plant diversity along boreal streams?

The patterns of plant species diversity along Swedish boreal streams are closely linked to flow of surface and sub-surface water. The linkages between vegetation and hydrology are tight, and according to Lenka Kuglerová they are threatened by poorly designed forest management. She defends her thesis at Umeå University, Sweden, on March 26.

Riparian zones -- the areas around rivers and streams which are temporarily flooded -- are important components of the boreal landscape. They are species rich and important for stream water quality and quantity, and aquatic food webs.

"I found strong relationships between plant species richness and position in the catchment. The position in the catchment is important because it determines how much water flows into the particular location," says ecologist Lenka Kuglerová.

Lenka Kuglerová studied riparian vascular plants, mosses and liverworts along a gradient of stream sizes in northern Sweden: from small headwaters in the Krycklan catchment area to the large Vindel River. The results show that species richness of riparian vegetation increases with increasing stream size.

"This is a result of increasing flood disturbance and inundation with increasing stream size, which enhances the heterogeneity of riparian habitat conditions, improves soil fertility, and increases water-dispersal success. This makes riparian zones along larger rivers favorable to more plant species," says Lenka Kuglerová.

Vegetation was also largely affected by groundwater in riparian zones. In areas where groundwater -- traveling from surrounding uplands -- discharges, more vascular plant species were found. Those riparian sites were also wider and had species rich communities of vascular plants, mosses, and liverworts further away from the stream channels in comparison to adjacent areas without groundwater discharge.

Groundwater discharge in riparian zones is beneficial not only for plant species richness but also for water chemistry and in turn for fish and aquatic insects. Groundwater discharge provides the environment with stable temperature and chemistry with higher pH and nitrogen availability.

Lenka Kuglerová suggests that Swedish forestry should stop using uniform widths of so called riparian buffers (vegetated strips along streams and rivers spared from logging) during forest harvest.

"Instead, hydrologically determined buffer widths should be applied with wider riparian buffers in groundwater discharge areas and narrower in riparian zones without groundwater. By this, we can protect biochemical and ecological hotspots, and avoid forestry machines getting stuck damaging the wet riparian soils."

Lenka Kuglerová has also studied the effects of stream restoration on riparian plants. Many streams in Sweden have been channelized in the past, to facilitate timber floating. Currently, streams are being restored to resemble natural, pre-channelization conditions. The results of Lenka Kuglerová's research indicate that restoring streams has the potential to increase species richness and biomass of riparian plants due to improvement of riparian habitat.

"The time for this recovery is however long and thus, the results are not as fast as we would wish for. Riparian environment became more favorable for plant growth after restoration but vegetation needs more time to recover and reach stable conditions," says Lenka Kuglerová.

Story Source:

The above story is based on materials provided by Umeå universitet. Note: Materials may be edited for content and length.

Share this story with your friends!

Social Networking

Please recommend us on Facebook, Twitter and more:

Other social media tools

Global Partners
Feedback

Tell us what you think of Chemistry 2011 -- we welcome both positive and negative comments. Have any problems using the site? Questions?

About us

Chemistry2011 is an informational resource for students, educators and the self-taught in the field of chemistry. We offer resources such as course materials, chemistry department listings, activities, events, projects and more along with current news releases.

Events & Activities

Are you interested in listing an event or sharing an activity or idea? Perhaps you are coordinating an event and are in need of additional resources? Within our site you will find a variety of activities and projects your peers have previously submitted or which have been freely shared through creative commons licenses. Here are some highlights: Featured Idea 1, Featured Idea 2.

About you

Ready to get involved? The first step is to sign up by following the link: Join Here. Also don’t forget to fill out your profile including any professional designations.

Global Partners