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| Registros recuperados: 17 | |
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| Zhang, Wei; Swinton, Scott M.. |
| The control of pests by their natural enemies represents an important ecosystem service that maintains the stability of agroecosystems and has the potential to mitigate pest control costs both to private producers and to society. Extending the "economic threshold" concept, this paper proposes an "ecological economic threshold" for pesticide use that takes into account the implicit cost of injury to natural enemies. By explicitly accounting for natural pest suppression, the ecological economic threshold can potentially make pest management more cost-effective while reducing dependence on toxic insecticides. The threshold is illustrated via an intra-seasonal dynamic bioeconomic model of soybean aphid management in Michigan, USA. A dynamic programming... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2006 |
URL: http://purl.umn.edu/21295 |
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| Swinton, Scott M.; Zhang, Wei. |
| The Earth's ecosystems provide myriad goods and services that are essential to human wellbeing. This paper offers a typology of ecosystem services that emphasizes the means by which humans experience the service rendered. The typology distinguishes between services that are directly experienced, and those that are indirect. The paper offers an illustration of how indirect services can be valued when they contributed to production of a marketed product. The intermediate product method described is amenable to indirect services that are one stage removed (Tier 2), two stages removed (Tier 3), or even farther removed from the direct services that humans experience. The intermediate product approach to ecosystem service valuation is illustrated by an... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Environmental Economics and Policy. |
| Ano: 2005 |
URL: http://purl.umn.edu/19536 |
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| Zhang, Wei; Parsons, Robert L.. |
| The Farm Level Income and Policy Simulation Modeling System (FLIPSim) is used to provide policymakers and dairy farmers estimated farm financial impact on the implementation of five field related Best Management Practices (BMP) designed to reduce phosphorus loading in Lake Champlain. Financial performance indicators are derived from deterministic and stochastic FLIPSim analyses for three Vermont dairy farms (60, 150, and 350 cows). Results indicate that residual management and conservation cropping incur the greatest financial impacts. Nutrient management increases income for the large and medium farms. None of the BMP's caused the farms to go out of business. However, the initial declining financial position of the small farm was hastened by the... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Livestock Production/Industries. |
| Ano: 2001 |
URL: http://purl.umn.edu/20766 |
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| Zhang, Wei; Power, William; Kerr, Suzi. |
| Under the New Zealand Emission Trading System (NZETS), post-1989 forestry land (the exotic or indigenous forest land that was not used for plantation on 31 December 1989) in New Zealand is eligible for reward for each tonne of CO2-eqv sequestrated by reverting from pasture to indigenous scrub. We use the Land Use in Rural New Zealand (LURNZ) model to conduct 2 simulations assuming that one tonne of CO2-eqv costs $25; The reference case is that no one has entered the NZETS, the other scenario is that the whole agriculture sector and indigenous forest (but not plantation) have entered the ETS. Each simulation estimates the amount of land use changes in dairy, sheep-beef and scrub from 2008 to 2015. By comparing these simulations, we identify the current use... |
| Tipo: Working or Discussion Paper |
Palavras-chave: Emission trading system; Scrub reversion; Agriculture; Environmental Economics and Policy; Land Economics/Use. |
| Ano: 2009 |
URL: http://purl.umn.edu/50896 |
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| Lin, C.-Y. Cynthia; Zhang, Wei; Umanskaya, Victoria I.. |
| In a typical driving restriction, vehicle use is restricted based on the vehicle’s license plate; one cannot drive vehicles with certain license plate numbers on certain days. Driving restrictions have been used as a method to reduce urban air pollution or traffic congestion because they are easy and inexpensive to implement. We investigate whether driving restrictions introduced in São Paulo, Bogotá, Beijing and Tianjin have improved air quality. Across different versions of the driving restrictions there is no evidence that the overall air quality at different places has been improved. However, several important results show up in this extensive analysis. Temporal shifting of driving is likely to appear when the restrictions are only effective during... |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Driving restriction; Air quality; Environmental Economics and Policy. |
| Ano: 2011 |
URL: http://purl.umn.edu/103381 |
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| Stranlund, John K.; Zhang, Wei. |
| We study the impact of bankruptcy risk on markets for tradable environmental and natural resource permits. We find that firms that risk bankruptcy demand more permits than if they were financially secure. Consequently, bankruptcy risk in a competitive market for tradable property rights causes an inefficient distribution of individual choices among regulated firms. Moreover, the equilibrium distribution of permits is not independent of the initial distribution of permits. In fact, the inefficiency that is associated with bankruptcy risk is mitigated if financially insecure firms are given a larger share of the initial allocation of permits. |
| Tipo: Working or Discussion Paper |
Palavras-chave: Bankruptcy; Tradable permits; Permit markets; Environmental Economics and Policy; L51; Q28; Q58. |
| Ano: 2007 |
URL: http://purl.umn.edu/7384 |
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| Horan, Richard D.; Claassen, Roger; Agapoff, Jean; Zhang, Wei. |
| We analyze how choosing to use a particular type of instrument for agri-environmental payments, when these payments are constrained by the regulatory authority's budget, implies an underlying targeting criterion with respect to costs, benefits, participation, and income, and the tradeoffs among these targeting criteria. The results provide insight into current policy debates. |
| Tipo: Conference Paper or Presentation |
Palavras-chave: Research Methods/ Statistical Methods. |
| Ano: 2004 |
URL: http://purl.umn.edu/20387 |
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| Registros recuperados: 17 | |
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