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• W2130208389 abstract "Long-term explorations serve to widen the perspectives of decision makers. Biophysical and technical possibilities and constraints are confronted with the valuedriven objectives of stakeholders in Multiple Goal Linear Programming (MGLP) models. Two methodological aspects of long-term explorations are elaborated in this thesis: uncertainty in agro-ecological coefficients and temporal aspects of land use. The effects of these aspects on generated land use scenarios are studied using data from the Northern Atlantic Zone of Costa Rica (NAZ). Uncertainties in agro-ecological coefficients concerning nutrients and biocides were quantified. Only uncertainties caused by lack of knowledge of underlying biophysical processes or lack of data for quantification were considered. Average, pessimistic and optimistic estimations of coefficients were generated, based on different perceptions of the influence of environmental factors. The estimations of the coefficients for various production activities are strongly correlated owing to the assumption of best technical means (i.e. inputs are used with the highest technical efficiency according to available knowledge and techniques). These coefficients were used in the single-period MGLP-model that was constructed for the NAZ. With the help of sensitivity analyses the effect of uncertainties on land use scenarios was determined for five tentative policy views, representing different perceptions of sustainability. It is concluded that, in long-term explorations, uncertainties in agroecological coefficients strongly affect the objective function values. However, they hardly affect the optimal land use allocation, because the ranking of production activities for the agro-ecological coefficients hardly changes when including uncertainties. In long-term explorations the following temporal aspects are relevant: 1. Growth and ageing of crops and livestock, 2. Fluctuations in coefficients caused by variation in weather conditions, 3. Interactions in time. After an inventory of possibilities and limitations to describe these temporal aspects in LP-models, a multi-period version of the single-period model was constructed. In theory, all temporal aspects can be described in multi-period MGLP-models, although location-bound temporal interactions pose serious problems owing to the limitations of the LP-technique. In most cases, the relevant types of temporal aspects can also be included in singleperiod models with the help of predefined cropping sequences and additional coefficients and variables. It is discussed, that in long-term explorations the use of a multi-period model may have added value only if large differences in coefficients between periods and growth stages occur and if strong bounds are put on fluctuations over periods. Based on the land use scenarios generated with the single-period and multi-period model it is concluded that there is considerable scope for policy in the NAZ. The differences between land use scenarios for the five policy views are large, regardless of the effects of the uncertainties in agro-ecological coefficients and the explicit inclusion of temporal aspects. By revealing the consequences and possibilities under particular land use objectives and constraints, this long-term exploration may help to structure and organize the discussion on desires for the future in the NAZ." @default.
• W2130208389 created "2016-06-24" @default.
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• W2130208389 date "1997-01-01" @default.
• W2130208389 modified "2023-09-27" @default.
• W2130208389 title "Uncertainty and temporal aspects in long-term explorations of sustainable land use : with reference to the Northern Atlantic Zone of Costa Rica" @default.
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