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Forest Management Zone Design with a Tabu Search Algorithm AgEcon
Krcmar, Emina; Mitrovic-Minic, Snezana; van Kooten, G. Cornelis; Vertinsky, Ilan.
Increased conflicts between timber production and environmental protection led some analysts to advocate land-use segregation, often referred to as forest management zoning. The objective of zoning is to create ecologically desirable non-fragmented forest reserves and group timber production areas. We formulate an integer programming model of forest zoning that explicitly addresses clustering of spatial units allocated to timber production and reserve zones while also promoting separation of these zones. A tabu search algorithm is developed, implemented and tested using a case study. The case study results indicate that up to 5% of the net financial return is sacrificed with a 'satisfactory' grouping of units within each zone. A 'good' separation between...
Tipo: Working or Discussion Paper Palavras-chave: Forest planning; Integer programming; Reserves; Tabu search; Timber production; Zoning; Environmental Economics and Policy; Land Economics/Use; Resource /Energy Economics and Policy; C60; Q23; R14.
Ano: 2005 URL: http://purl.umn.edu/37022
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Optimal control of spatial-dynamic processes: The case of biological invasions AgEcon
Epanchin-Niell, Rebecca S.; Wilen, James E..
This study examines the spatial nature of optimal bioinvasion control. We develop and parameterize a spatially explicit two-dimensional model of species spread that allows for differential control across space and time, and we solve for optimal control strategies. We find that the qualitative nature of optimal strategies depend in interesting ways on aspects of landscape and invasion geometry. For example, we show that reducing the extent of exposed invasion edge, through spread, removal, or strategically employing landscape features, can be an optimal strategy because it reduces long-term containment costs. We also show that optimal invasion control is spatially and temporally “forward-looking” in the sense that strategies should be targeted to slow the...
Tipo: Conference Paper or Presentation Palavras-chave: Invasive species; Spatial-dynamic processes; Spatial spread; Reaction-diffusion; Management; Cellular automaton; Eradication; Containment; Spatial control; Integer programming; Environmental Economics and Policy; Land Economics/Use; Resource /Energy Economics and Policy; Q; Q1; Q2; Q5.
Ano: 2010 URL: http://purl.umn.edu/61375
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Positive Analysis of Invasive Species Control as a Dynamic Spatial Process AgEcon
Buyuktahtakin, Esra; Feng, Zhuo; Olsson, Aaryn; Frisvold, George B.; Szidarovszky, Ferenc.
This paper models control of invasive buffelgrass (Pennisetum ciliare), a fire-prone African bunchgrass spreading rapidly across the southern Arizona desert as a spatial dynamic process. Buffelgrass spreads over a gridded landscape. Weed carrying capacity, treatment costs, and damages vary over grid cells. Damage from buffelgrass depends on its spatial distribution in relation to valued resources. We conduct positive analysis of recommended heuristic strategies for buffelgrass control, evaluating their ability to prevent weed establishment and to reduce damage indices over time. The high dimensionality of the problem makes full dynamic optimization intractable. However, two heuristic strategies – potential damage weighting and consecutive year treatment –...
Tipo: Conference Paper or Presentation Palavras-chave: Invasive species; Integer programming; Crop Production/Industries; Environmental Economics and Policy; Q57; Q58.
Ano: 2010 URL: http://purl.umn.edu/61753
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