Introduction Ecological---Economic Economic Economic relationships and the sustainable management of rangelands. A case of Bio-A case of Bio ---economic economic economic modelingmodelingmodelingin iinn in Namibia livelihoods. ...

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  • *Institute for Agricultural Policy & Market Research // JL University of Giessen // Germany //

    Stephanie.Domptail@agrar.uni-giessen.de

    EcologicalEcologicalEcologicalEcological----Economic Economic Economic Economic relationships relationships relationships relationships and the and the and the and the sustainable management of sustainable management of sustainable management of sustainable management of rangelands. rangelands. rangelands. rangelands.

    A case of BioA case of BioA case of BioA case of Bio----economic economic economic economic modelingmodelingmodelingmodeling in in in in NamibiaNamibiaNamibiaNamibia

    Stephanie Domptail*

    Rangelands are present on arid and semi arid climates and are a most important source of livelihood in Saharan and sub-Saharan

    Africa. Degradation of rangelands world wide and in Namibia has

    been thematized as it is clearly linked to farmers and rural livelihoods.

    Rangelands management is the result of both ecological and

    economic pressures, and their interaction. Our work is part of the

    biodiversity project BIOTA Africa. It aims at providing more understanding of the dynamics and feedbacks existing between

    the ecological and the economic subsystems considering the ranching activity.

    Introduction

    Qualitative analysis

    Vulnerability approach: Identify points of pressure which constraint farmers in their land use

    Method: Text analysis

    Data: Text data of expert interviews and farmers interviews

    How do ecological and

    economic dynamics integrate in

    the making of strategies for

    rangeland management ?

    Bio-economic model enables the assessment of ecological, economic and some institutional parameters on land use decision making using scenario analysis. Main results are that expectations of farmers over the ecological and economic pattern of

    pressure, as well as farmers objectives are key element in stocking strategies.

    However, a further qualitative analysis can reveal complementary information on the constraints imposed by the environment on

    farmers strategies.

    Quantitative analysis

    Environmental / ecological economic approach: Model system and identify key parameters and relationships in system for decision making upon land use

    Method: Bio-economic modeling: depicts STRATEGIES which INTEGRATE the ecological consequences of farm management in the calculation of the optimal land use strategy under STOCHASTIC conditions

    Data: Model parameterized using interview data. Produced data describe land use strategies under different conditions (sensitivity analysis) and scenarios

    Outlook

    How do external ecological,

    economic and institutional

    constraints affect this dynamic ?

    Picture 2006

    Variable costs

    Stocking density

    Fixed costs

    Biomass

    (grass/bush)

    Lamb sales

    Income

    RainfallRangeland

    condition/state

    Decision making

    Ecological feedback

    Economic feedback

    Farm scale

    Landscape scale

    EcologicalEconomic

    Institutional

    Environment

    Case study: Typical

    commercial ranch

    Arid southern Namibia (rainfall 150 mm a year)

    Farming system: Interviews with

    about 25 commercial farmers

    Rangeland condition:represented with State-and-

    Transition model: 6 different rangeland ecological states

    http://encarta.msn.com/map_

    701514947/namibia.html

    State 1: high cover grass dominated

    State 2: high cover bush range

    State 3: bare land State 4: sparse vegetation State 5: bush dominated State 6: dominated by annuals grasses

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