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Impacts of grazing and rainfall variability on the dynamics of a Sahelian rangeland revisited (Hein, 2006) : new insights from old data

Title data

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. Vol. 67 (2006) Issue 1 . - pp. 157-164.
ISSN 0140-1963
DOI: https://doi.org/10.1016/j.jaridenv.2006.01.002

Abstract in another language

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.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER35929
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences > Chair Biogeography
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Earth Sciences
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 18 Jun 2015 06:35
Last Modified: 18 Jun 2015 06:35
URI: https://eref.uni-bayreuth.de/id/eprint/15252