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Past,present and future of industrial plantation forestry and implication on future timber harvesting technology 被引量:4
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作者 andrew mcewan Enrico Marchi +1 位作者 Raffaele Spinelli Michal Brink 《Journal of Forestry Research》 SCIE CAS CSCD 2020年第2期339-351,共13页
Plantation forests are established,and expanding,to satisfy increasing global demand for timber products.Shifting societal values,such as safety,productivity,environmental,quality and social are influencing the planta... Plantation forests are established,and expanding,to satisfy increasing global demand for timber products.Shifting societal values,such as safety,productivity,environmental,quality and social are influencing the plantation forestry sector.This is primarily driven through an ever increasing world population,which in turn influences the way nations view the value systems by which they live.More people require more resources-also forest products.Also,the availability of information is influencing the pace of technological development.These changes could result in a difference in the management of plantations that could affect the forest engineering systems of the future.This review aimed to summarize the current status of plantation forests;summarize future developments and possible scenarios in forest plantation management for the various products;and assess whether these developments in a plantation environment could affect the harvesting systems used.Factors influencing the form of plantations include the type and nature of the plantation owner;the change in demand for different and new forest products;climate change factors,including the use of biomass for energy,carbon sequestration and trading;ecosystem services and other products and services;and sustainability certification of forest management.The impact and influence of these factors were summarised into a series of key drivers that will influence the technology used in harvesting machines,as well as the choice of harvesting machines,systems and methods.These drivers were the effect of variations in tree size,the expansion of plantation areas onto more difficult terrain,diversity in plantation design,increased attention towards site impacts and the increased use of biomass for energy.Specific information is provided regarding how the harvesting systems could be affected. 展开更多
关键词 Plantations Forest products Biomass Harvesting system MECHANIZATION Trends TECHNOLOGY
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评估由残留放射性物质造成的辐射剂量——穆鲁罗瓦和方阿陶法环礁上的潜在剂量
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作者 GORDON LINSLEY andrew mcewan 《国际原子能机构通报》 1998年第4期38-42,共5页
穆鲁罗瓦环礁过去只是偶尔有人居住,方阿陶法环礁上则没有证据表明有人居住过。缺少淡水和易受海水侵袭,使人很难在这些环礁上住下去。但是,就"国际性的穆鲁罗瓦和方阿陶法环礁放射学状况研究"而言。
关键词 辐射剂量 放射性物质 环礁湖 人工放射性核素 放射性落下灰 居民 潜在剂量 残留物 大气层 核试验
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