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在美国1974年颁布的资源计划条例和1976年颁布的国有林管理条例中,都要求对国有林所提供的产品和劳务的效益作出评价。根据国有林产品的不同产量水平或混合产品水平的收入与相应的成本相对比,来确定什么样的产量水平或混合的产量水平是最有效的和最有利的。这样做,相对地容易满足其产品在市场上出售的需要。然而,除了木材外,国有林的许多产品不在任何有组织的市场上交易,或者不是卖给“出价”最高的用户。对买卖的资源与非买卖资源进行比较,不是国有林经济评价所独有的,美国的土地管理局,工程兵团,垦殖局和土壤保护局等政府机构,同样都遇到这个问题。
Both the resource planning regulations promulgated by the United States in 1974 and the state forest management regulations promulgated in 1976 require the evaluation of the benefits of the products and services provided by state-owned forests. It is most effective and beneficial to determine what level of output or mixed production levels are based on the relative or not-to-income ratio of state-owned forest products at different or mixed product levels. In doing so, it is relatively easy to meet the needs of their products for sale on the market. However, with the exception of timber, many products from state-owned forests are not traded in any organized market or sold to users with the highest bid. The comparison of traded and non-traded resources is not unique to the State-owned Forest Economic Assessments. The same is true of government agencies such as the Bureau of Land Management, the Corps of Engineers, the Bureau of Reclamation and the Soil Conservation Bureau in the United States.