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| Registros recuperados: 38 | |
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| Koeshendrajana, Sonny; Cacho, Oscar J.. |
| The inland fishery in South Sumatra, Indonesia, is an important source of income, employment and protein to small-scale fishers. Some overall indicators, such as virtual disappearance of certain important species and continuous reduction in the size of harvested fish, indicate that the fishery is not being exploited on a sustainable basis. In this study, an evaluation of the status of the existing fish stock is undertaken, and an analytical model for identifying efficient levels of exploitation of the fishery is developed. Primary data are used to describe the current costs of fishing effort. Secondary data, combined with results of analysis of primary data, are then used to derive a supply function for the fishery. Different types of fishing gear are... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Smallholder fisheries; Bioeconomic analysis; Inland fisheries; Indonesia; Sumatra; Resource /Energy Economics and Policy. |
| Ano: 2001 |
URL: http://purl.umn.edu/12932 |
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| Cacho, Oscar J.; Hester, Susan M.. |
| Invasive species can cause significant damage to natural environments, agricultural systems, human populations and the economy as a whole. Biological invasions are complex dynamic systems which are inherently uncertain and their control involves allocation of surveillance and treatment resources in space and time. A complicating factor is that there are at least two types of surveillance: active and passive. Active surveillance, undertaken by pest control agencies, has high sensitivity but generally low coverage because of its high cost. Passive surveillance, undertaken by the public, has low sensitivity and may have high coverage depending on human population density. Its effectiveness depends on the extent to which information campaigns succeed in... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Search theory; Invasive species; Dispersal; Passive surveillance.; Environmental Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/100535 |
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| Cacho, Oscar J.; Lipper, Leslie. |
| Agroforestry projects have the potential to help mitigate global warming by acting as sinks for greenhouse gasses. However, participation in carbon-sink projects may be constrained by high costs. This problem may be particularly severe for projects involving smallholders in developing countries. Of particular concern are the transaction costs incurred in developing projects, measuring, certifying and selling the carbon-sequestration services generated by such projects. This paper addresses these issues by analysing the implications of transaction and abatement costs in carbon-sequestration projects. A model of project participation is developed, which accounts for the conditions under which both buyers and sellers would be willing to engage in a carbon... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Agroforestry; Climate Policy; Carbon Sequestration Costs; Environmental Economics and Policy; Q23; Q57; O1; O13. |
| Ano: 2007 |
URL: http://purl.umn.edu/9324 |
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| Cacho, Oscar J.; Greiner, Romy; Fulloon, Lachlan. |
| Large areas of agricultural land under conventional crops and pastures are at risk of dryland salinisation in Australia. The salinisation problem can be controlled by strategic and large‐scale planting of trees; however, farm forestry enterprises evaluated with conventional discounting techniques do not generally rank as an attractive alternative to annual crops on productive land. In this article, an optimal control model that explicitly accounts for decline or improvement in land quality over a period of 40 years is presented. The optimal area planted to trees and the optimal groundwater‐table trajectory through time are determined under a variety of scenarios. Implications of the results for policy design are discussed. |
| Tipo: Journal Article |
Palavras-chave: Resource /Energy Economics and Policy. |
| Ano: 2001 |
URL: http://purl.umn.edu/117391 |
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| Odem, Doreen; Sinden, Jack A.; Cacho, Oscar J.; Griffith, Garry R.. |
| Scotch broom (Cytisus scoparius, L.), is an exotic leguminous shrub, native to Europe, which invades pastoral and woodland ecosystems and adjoining river systems in cool, high rainfall regions of southeastern Australia. Broom has invaded 10,000 hectares of eucalypt woodland at Barrington Tops National Park in New South Wales, and is having a major impact on the natural ecology of the sub-alpine environment. It is extremely competitive with the native flora, retarding their growth and in many areas blanketing the ground and preventing growth of many understorey species in open forest areas. An active program to manage this invasion is being implemented by the National Parks and Wildlife Service. The management issues include whether eradication or... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Scotch broom; Economic issues; Management issues; Natural environments; Bioeconomic model; Environmental Economics and Policy. |
| Ano: 2003 |
URL: http://purl.umn.edu/58193 |
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| Moss, Jonathan; Cacho, Oscar J.; Mounter, Stuart W.. |
| With the impending introduction of an Australian Carbon Pollution Reduction Scheme, farmers and landholders in rural Australia have increased opportunities to participate in the market. This includes the adoption of land-use change to sequester additional carbon in exchange for carbon credits and the production of a renewable energy source (biofuels). However, these land-use changes compete with existing farm enterprises and may contain significant transaction costs. Therefore it is necessary for the institutional arrangements to provide adequate incentives for landholders to adopt these land-use changes. This paper examines the potential supply of these land-use changes for climate mitigation from landholders in a northern NSW catchment. These results... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Border Rivers-Gwydir; Carbon sequestration; Land-use change; Resource /Energy Economics and Policy. |
| Ano: 2010 |
URL: http://purl.umn.edu/59104 |
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| Jones, Randall E.; Cacho, Oscar J.. |
| It is argued in this paper that static approaches to weed management, where the benefits and costs are only considered within a single season, are inappropriate for assessing the economic benefits of weed control technologies. There are carryover effects from weed management as weeds that escape control in one season may reproduce and replenish weed populations in following seasons. Consequently, it is appropriate to view weed control in the context of a resource management problem where the goal is to determine the optimal inter-temporal level of weed control that maximises economic benefits over some pre-determined period of time. A dynamic optimisation model for weed control is presented. Using the tools of comparative static analysis and Pontryagin's... |
| Tipo: Presentation |
Palavras-chave: Crop Production/Industries. |
| Ano: 2000 |
URL: http://purl.umn.edu/123685 |
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| Wise, Russell M.; Cacho, Oscar J.. |
| The Clean Development Mechanism of the Kyoto Protocol provides the opportunity for smallholders to receive financial rewards for adopting tree-based systems that are sustainable. In this paper a meta-model is developed to simulate interactions between trees, crops and soils under a range of management regimes for a smallholding in Sumatra. The model is used within a dynamic-programming algorithm to determine optimal tree/crop areas, tree-rotation lengths, firewood-harvest and fertilizer application rates for a landholder faced with deteriorating land quality and opportunities to receive carbon credits and fertiliser subsidies. It is found th at profit maximising management strategies depend on initial soil quality. For example, incentives to participate in... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Land Economics/Use. |
| Ano: 2006 |
URL: http://purl.umn.edu/25356 |
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| Hean, Robyn L.; Cacho, Oscar J.; Signor, Anthony; Mullen, John D.. |
| The focus of this paper is the role of farm forestry in farming systems in the NSW wheatsheep zone. The wheat-sheep zone suffers from significant land degradation problems, and the environmental and economical sustainability of many farming systems is in question. Farm forestry provides the opportunity to diversify farmer incomes, increase agricultural productivity and provide environmental solutions. It is therefore proposed that the potential role of farm forestry in the wheat-sheep zone is to provide an environmentally and economically sustainable future for farming systems, through tree planting for multiple benefits. A general model is developed for the purpose of economic analysis of agroforestry systems in the wheat-sheep zone using a bioeconomic... |
| Tipo: Presentation |
Palavras-chave: Farm forestry; Farming systems; Bioeconomics; Resource /Energy Economics and Policy. |
| Ano: 2000 |
URL: http://purl.umn.edu/123659 |
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| Hean, Robyn L.; Cacho, Oscar J.. |
| Giant-clam farming is undertaken by coastal villagers in Solomon Islands as part of a research and development project of the International Center for Living Aquatic Resources Management (ICLARM). The production technology is simple and does not require a large capital investment. The main inputs are clam seed, labour and time. Labour is used for activities such as seeding, cleaning, thinning and harvesting. In this paper, a bioeconomic model is used to explore optimal farm management. The theoretical basis for this analysis is found in the economic theory of optimal forestry exploitation. The management variables considered are husbandry applied to cleaning and the frequency with which thinning is undertaken. The optimal cycle-length is determined... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Bioeconomics; Giant clams; Subsistence mariculture; Farm Management. |
| Ano: 1999 |
URL: http://purl.umn.edu/12935 |
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| Cacho, Oscar J.; Wise, Russell M.; Hester, Susan M.; Sinden, Jack A.. |
| When a weed invasion is discovered a decision has to be made as to whether to attempt to eradicate it, contain it or do nothing. Ideally, these decisions should be based on a complete benefit-cost analysis, but this is often not possible. A partial analysis, combining knowledge of the rate of spread, seedbank longevity and economic-analysis techniques, can assist in making the best decision. This paper presents a model to decide when immediate eradication of a weed should be attempted, or whether weed control should be attempted at all. The technique is based on identifying two 'switching points': the invasion size at which it is no longer optimal to attempt eradication, and the invasion size at which it becomes optimal not to apply any form of control. It... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Invasive species; Eradication; Containment; Economics; Weed control; Switching point; Farm Management. |
| Ano: 2004 |
URL: http://purl.umn.edu/12908 |
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| Cacho, Oscar J.; Fulloon, Lachlan; Greiner, Romy. |
| Dryland salinity emergence is an important land degradation problem in Australia. Large areas of agricultural land where conventional crops and pastures are produced are at risk. The salinisation problem can be controlled by planting trees in conjunction with crops, but a disadvantage of growing trees as a farm enterprise is the long lag between planting and harvest. When farm forestry enterprises are evaluated with conventional discounting techniques they do not generally rank as an attractive alternative to annual crops on productive land. In this paper, a dynamic model that explicitly accounts for decline or improvement in land quality over a period of 40 years is presented. The model is solved for a hypothetical farm on the Liverpool Plains of NSW. The... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Soil salinity; Farm forestry; Dynamic modelling; Farm Management; Land Economics/Use. |
| Ano: 1999 |
URL: http://purl.umn.edu/12895 |
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| Registros recuperados: 38 | |
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