Forestry Land Use Research Articles

Fluvial sediment inputs to upland gravel bed rivers draining forested catchments: potential ecological impacts

Abstract. As identified by the detailed long-term monitoring networks at Plynlimon, increased sediment supply to upland fluvial systems is often associated with forestry land-use and practice. Literature is reviewed, in the light of recent results from Plynlimon sediment studies, to enable identification of the potential ecological impacts of fluvial particulate inputs to upland gravel bed rivers draining forested catchments similar to the headwaters of the River Severn. Both sediment transport and deposition can have significant impacts upon aquatic vertebrates, invertebrates and plants.

Renewable and Nonrenewable Resource Theory Applied to Coastal Agriculture, Forest, Wetland, and Fishery Linkages

This paper addresses tradeoffs in wetland development using a framework that integrates economic theory of renewable and nonrenewable resources. The theory treats wetland development as use of a nonrenewable resource, while wetland preservation protects critical fishery habitat. The framework recognizes that wetland quality may vary for either development or fisheries. An illustrative application assesses tradeoffs in converting pocosin wetlands to agriculture rather than maintaining wetlands to protect salinity in estuarine nursery areas. Results reveal the marginal value of salinity protection may be substantial, while location may affect a wetland's value to an estuarine shrimp fishery. Comparisons between agricultural and forestry landuses show that ecological links may cause wetland values to depend upon the land-use chosen for the developed state. Future assessments of other development may reveal additional impacts through impacts on salinity.

森林植生の類型化に基づくその保全に関する研究

The purpose of this paper is to consider the conservation of forest vegetation of the prefectures by the classification of the futures of forest.As many of the cities are located in the plain areas, the expansion of urbanl and use directly erodes agricultural land uses. The agricultaral land use is compensated by the forestry use land from the national points of view. On the basis of the comparisons between the proportion ratios of urban land use, agricultural land use and forestry land use in each prefectures, the expansion of urban land use has seemingly a clear relationship with the decrease of forestry land use rather than that of agricultural land use.According to the location quotients of natural forest, secondary forest and artificial forest, the forest vegetations of the prefectures are classfied into some types. These types of forest vegetation show that the futures of forest vegetation vary in different localities and that the distribution pattern of natural forest has a deep relationship with the spread of urban lana use.The expansion of urban land use has a deep relationship with the expansion of “Densely Inhabited District (DID)” which is considered as the one of the indicators for urbanization in our country. DID is defined as an area within a local body that is composed of a group of contiguous enumeration districts, each of which has a population density of about 4, 000 inhabitants or more per square kilometer, and whose total population exceeds 5, 000 as of the date of survey. The prefectures are divided into classes according to the proportion of DID.The comparisons between the types of forest vegetation and DID of the prefectures show that all prefectures are classfied into 7 “District Types (DT)”......... Natural Forest DT, Semi-Natural Forest DT, Secondary.Artificial Forest DT, Secondary Forest DT, Artificial Forest DT, Urbanization DT and Over-Population DT. These District Types are very useful for making a gudeline of forest coservation and for examing a vegetation management plan.

Forest Economics Research Needs in West-Central Canada

A group of approximately 90 respondents, through sequential mail questionnaires and area group meetings, identified integrated forest land use, forest protection, allowable cut determination/timber supply analysis modelling, non-timber forest land uses, agricultural and forestry land use interface and forest renewal as among the more important needs requiring considerable economic research. Constraints in meeting these research needs include lack of research expertise, funding, data and problem definition, conflicting objectives and non-quantifiable.benefits and costs. Key Words: Forest economics, Research needs, Canada, Prairie Provinces/Northwest Territories, Delphi technique, Canadian Forestry Service, Research inventory, Nominal group technique, Research constraints.