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Retzer, Vroni:
Impacts of grazing and rainfall variability on the dynamics of a Sahelian rangeland revisited (Hein, 2006) : new insights from old data.
In: Journal of Arid Environments.
Bd. 67
(2006)
Heft 1
.
- S. 157-164.
ISSN 0140-1963
DOI: https://doi.org/10.1016/j.jaridenv.2006.01.002
Abstract
Understanding the dynamics of semi-arid rangelands is a prerequisite for their proper management and long-term enclosure experiments are an important tool to investigate grazing impact. Hein [2006. The impacts of grazing and rainfall variability on the dynamics of a Sahelian rangeland. Journal of Arid Environments 64, 488–504] presents findings from a 10 year enclosure experiment in the semi-arid Ferlo, Senegal. His main conclusion is that current high-grazing pressure (0.15–0.20 TLU/h) negatively affects rain use efficiency and productivity especially in dry years because differences between treatments are significant for the whole period as well as for dry years only.A re-analysis under the framework of non-equilibrium theory of rangeland science leads to an alternative interpretation of the data. The vegetation on the more intensively grazed site possesses a remarkable resilience after the drought of 1983 and 1984. Standing crop recovers fast and for 2 years is even higher on the “high grazing” treatment than on the less intensively grazed treatment. Statistical analysis confirms this: a general linear model for standing crop against effective precipitation and grazing treatment finds a significant contribution of precipitation only (p<0.0001). Thus, vegetation dynamics in the semi-arid Ferlo largely follows a non-equilibrium dynamic as it is rather driven by precipitation dynamics than by grazing. This also leads to different policy implications: droughts reduce livestock density and thus are important to allow the vegetation to rest for 1 or 2 years.
Weitere Angaben
| Publikationsform: | Artikel in einer Zeitschrift |
|---|---|
| Begutachteter Beitrag: | Ja |
| Zusätzliche Informationen: | BAYCEER35929 |
| Institutionen der Universität: | Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften > Lehrstuhl Biogeographie Forschungseinrichtungen > Forschungszentren > Bayreuther Zentrum für Ökologie und Umweltforschung - BayCEER Fakultäten Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften Fakultäten > Fakultät für Biologie, Chemie und Geowissenschaften > Fachgruppe Geowissenschaften Forschungseinrichtungen Forschungseinrichtungen > Forschungszentren |
| Titel an der UBT entstanden: | Ja |
| Themengebiete aus DDC: | 500 Naturwissenschaften und Mathematik |
| Eingestellt am: | 18 Jun 2015 06:35 |
| Letzte Änderung: | 18 Jun 2015 06:35 |
| URI: | https://eref.uni-bayreuth.de/id/eprint/15252 |