نتایج جستجو برای: high capital cost in forest harvesting
تعداد نتایج: 17335536 فیلتر نتایج به سال:
nowadays because of various factors, including inappropriate land use, and indiscriminate exploitation of water resources, soil and vegetation, wide areas of the country were exposed to destruction of lands and desertification. therefore dealing with this situation requires a comprehensive land use program (water and land) and appropriate environment potency. the study area is patom district of...
the current study examined iranian undergraduate efl students’ willingness to communicate with regard to their vocabulary knowledge. in general, participants were somewhat willing to communicate in english. the total mean score of 730 university students’ perception of willing to communicate was 83.53 out of 135. results, regarding four parts of willingness to communicate, revealed that part...
The proposed paper describes the architecture of a GIS-based Environmental Decision Support System (EDSS) that integrates software tools and sensors, such as: remote sensing for environmental monitoring and support to mathematical models, optimization models (for planning plant size, kind, and biomass harvesting), dynamic forest growth models, and models for carbon dioxide balance calculation. ...
Managing complex tropical forest requires up to date technology in ensuring sustainable resources utilisation. Much of the current forest management practices can be improved through the use of current technologies including remote sensing, GIS (Geographic Information System) and GPS (Global Positioning System) which may enhance any decision making process. This paper highlighted the use of cur...
The problem investigated in this paper is focused on integrated tactical planning in the lumber supply chain which is featured as a divergent value chain. In this industry, raw materials (logs) are shipped from forest contractors to sawmills. Then the logs are sawn to finished lumbers and are distributed to the lumber market through different channels. A mixed integer programming (MIP) model is...
Although the northeastern US includes extensive areas of aggrading forest, uncertainty regarding the intensity and pattern of forest harvesting hampers an understanding of important ecological processes and characteristics such as carbon and nitrogen storage, habitat quality, and forest dynamics, and impedes regional conservation and management planning. Due to the complex ownership pattern dom...
Wild edible plants, ecological foodstuffs obtained from forest ecosystems, grow in natural fields, and their productivity depends on their response to harvesting by humans. Addressing exactly how wild edible plants respond to harvesting is critical because this knowledge will provide insights into how to obtain effective and sustainable ecosystem services from these plants. We focused on bamboo...
Abstract The article provides an overview of the experience using shelterwood systems in Estonia and methodological aspects their economic assessment. methodology is tested with calculations made on management alternatives pine ( Pinus sylvestri s L.) stand Rhodococcum site type. Based Estonian forest rules results previous silvicultural studies, models were elaborated for different types harve...
The complicated process of public forest land allocation involves competing economies of scale. While harvesting cost economies of scale may benefit harvesters, where average costs decline as contiguous harvested acreage increases, larger harvested areas can generate diseconomies in terms of environmental and ecosystem damage. This paper extends existing timber rotation models to more completel...
The Forest Service, the largest agency in the U.S. Department of Agriculture, has traditionally used the expression "community stability" to describe its rural development policy. That has meant growing and harvesting trees following principles of "sustained yield" so that local industries (and the employment they generate) can be supported over long periods of time. In recent years, however, e...
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