Navigation Links
Fires regenerate African grassland
Date:9/19/2008

This release is available in German.

Windhoek/Leipzig. Natural grass fires are evidently more important for the ecology of savannahs than has previously been assumed. This is the finding of a study carried out in Etosha National Park in the north of Namibia. It is the first study to have investigated the complex interplay of the factors fire, competition, moisture and seed availability in relation to a grass species. Periodic fires in semi-arid regions can lead to older tufts of grass disappearing, thereby making room for younger grasses. Writing in the Journal of Ecology, the researchers from the Helmholtz Centre for Environmental Research (UFZ), the University of Frankfurt am Main and the University of Cologne say that fire therefore plays an important role in regeneration. The findings are particularly significant for the management of semi-arid nature reserves, in which, in the absence of natural plant eaters, fires are the only practical means of renewing the grass canopy.

For the study, the researchers selected an area measuring 500 by 500 metres in Etosha National Park because it has one dominant grass species and because it was possible to rule out interference such as grazing and other human influences. Etosha National Park in the north of Namibia is the second largest nature reserve in Africa, measuring 20,000 square kilometres. The temperatures in the semi-arid savannah fluctuate between 6 degrees centigrade in the winter and 35 degrees in the summer. The area under investigation is one of the driest areas in which plants can still grow, with annual rainfall of just 380 mm. That is less than the rainfall in the rain shadow of the Harz mountains.

Stipagrostis uniplumis is the dominant grass species and lives for several years. The researchers observed the growth of these grasses at weekly intervals for one season and measured the most important climate parameters. They also experimented on small areas by sowing additional seeds, carrying out controlled reconstructions of fires, planting competing grass species and using artificial irrigation. They found that the dead grass layer significantly hindered the recruitment of young plants. Fire can break up the old grass layer, thereby creating opportunities for regrowth. By contrast, artificial irrigation and the addition of seeds did not result in higher recruitment of seedlings.

The largest ever conference of ecologists from all over Europe was taking place in Leipzig from 15 to 19 September 2008. Over 1000 participants from more than 30 countries have registered for EURECO-GFOE 2008. The conference is a joint meeting of the European Ecological Federation (EEF) and the Gesellschaft fr kologie (Gf) and is being organised at the Congress Center Leipzig by the Helmholtz Centre for Environmental Research (UFZ) and the Universities of Halle-Wittenberg and Leipzig. The EEF is the umbrella organisation of the national ecological associations in Europe. Over 8000 ecologists belong to its member associations. The Gf is the ecological society of Germany, Austria and Switzerland.


'/>"/>

Contact: Tilo Arnhold
presse@ufz.de
49-341-235-1635
Helmholtz Association of German Research Centres
Source:Eurekalert  

Related biology news :

1. US fires release large amounts of carbon dioxide
2. Massive California fires consistent with climate change
3. Jefferson urologists studying regenerated neo-bladder to help spinal cord injury patients
4. New gene variant identified for nondiabetic end stage renal disease in African-Americans
5. African-Americans have unique lung cancer risks from chronic obstructive pulmonary disease
6. When threatened, a few African frogs can morph toes into claws
7. Many African-Americans have a gene that prolongs life after heart failure
8. Alcohol and malt liquor availability and promotion higher in African American inner cities
9. Marsupial lion tops African lion in fight to death
10. Study: weight-loss tips differ in African-American, mainstream magazines
11. Study of African traditional medicine will begin world-first clinical trial
Post Your Comments:
*Name:
*Comment:
*Email:
Related Image:
Fires regenerate African grassland
(Date:4/19/2017)... The global military biometrics market ... by the presence of several large global players. The ... major players - 3M Cogent, NEC Corporation, M2SYS Technology, ... 61% of the global military biometric market in 2016. ... military biometrics market boast global presence, which has catapulted ...
(Date:4/13/2017)... 13, 2017 UBM,s Advanced Design and Manufacturing ... feature emerging and evolving technology through its 3D Printing ... run alongside the expo portion of the event and ... demonstrations focused on trending topics within 3D printing and ... manufacturing event will take place June 13-15, 2017 at the ...
(Date:4/11/2017)... Research and Markets has announced the addition ... their offering. ... tracking market to grow at a CAGR of 30.37% during the ... 2017-2021, has been prepared based on an in-depth market analysis with ... its growth prospects over the coming years. The report also includes ...
Breaking Biology News(10 mins):
(Date:10/11/2017)... ... October 11, 2017 , ... At ... Purple announced Dr. Suneel I. Sheikh, the co-founder, CEO and chief research scientist ... has been selected for membership in ARCS Alumni Hall of Fame . ...
(Date:10/11/2017)... CA, USA (PRWEB) , ... October 11, 2017 , ... ... to take place on 7th and 8th June 2018 in San Francisco, CA. The ... influencers as well as several distinguished CEOs, board directors and government officials from around ...
(Date:10/11/2017)... LAGUNA HILLS, Calif. , Oct. 11, 2017 /PRNewswire/ ... London (ICR) and University of ... tool to risk-stratify patients with multiple myeloma (MM), in a ... . The University of Leeds is ... Myeloma UK, and ICR will perform the testing services to ...
(Date:10/11/2017)... Tampa Bay, Florida (PRWEB) , ... October 11, ... ... Food and Drug Administration (FDA) has granted orphan drug designation to SBT-100, its ... antibody (sdAb) for the treatment of osteosarcoma. SBT-100 is able to cross the ...
Breaking Biology Technology: