农学 >>> 农学总论 作物学 园艺学 土壤学 植物保护学 农药学 林学 畜牧学 兽医学 水产学
搜索结果: 1-15 共查到农学 roads相关记录15条 . 查询时间(0.09 秒)
Peatlands in the western boreal plains of Canada are important ecosystems as they store over two percent of global terrestrial carbon. However, in recent decades, many of these peatlands have been fra...
The current review summarizes the knowledge generated by the recently published studies of the last twenty years, in the field of forest road networks, concerning the impact of forest road constructio...
Predicting the Location of Deforestation in North Thailand: The Role of Roads and Protected Areas
We estimate an equilibrium model of land clearing to study the impacts of roads and population on deforestation in Thailand between 1976 and 1989. Population pressures were more important in the N...
The present investigation was carried out to assess the influence of vegetation type and horizontal curve radius on the rate of tree pruning to provide the line of sight on horizontal curves in Casp...
A road network in forest lands provides easy access to forest resources for extraction, regeneration, protection and recreation activities. Erosion from forest roads and skid trails is a major concern...
This study was conducted to assess the effect of forest road as a corridor on local biodiversity. For this purpose, 10 segments in a 10 year-old road were selected in Neka-Zalemrood forest in Hyrcania...
The Lednice-Valtice Cultural Landscape is an exemplary area that has been influenced by purposeful human activity for a long time. Under these conditions the nonesuch, highly cultural and ecologically...
There are an estimated 400 000-550 000 km of unpaved resource roads in British Columbia. These roads are used for forest, mineral, and energy development, commercial and public recreation, and in some...
In this questionnaire study, which was conducted to determine public opinions and expectations about the use of highways as scenic road in order to contribute the aim, an alternative road, Erzurum - &...
The aim of the study was to investigate the effects of forest roads on foliage discoloration levels of oriental spruce Picea orientalis (L.) Link by Ips typographus (L.), considering location, ground ...
Traffic load and transported quantity due to forest management were analysed on the forest roads in the forest district Dragatuš, SE Slovenia. On the basis of timber gravitating to particular s...
The categorisation of forest roads can be based on several different criteria. In this paper, the outlines of the primary forest traffic infrastructure were divided according to the traffic load typ...
An unlimited number of alternative paths can be generated to connect 2 end points. Modern optimization techniques, which perform a systematic search for an optimum solution, can be used to solve such ...
WASHINGTON, Dec. 28, 2006 - Agriculture Secretary Mike Johanns today announced that more than $385 million in Forest Service revenue will be distributed to 41 states and Puerto Rico for improvements t...

中国研究生教育排行榜-

正在加载...

中国学术期刊排行榜-

正在加载...

世界大学科研机构排行榜-

正在加载...

中国大学排行榜-

正在加载...

人 物-

正在加载...

课 件-

正在加载...

视听资料-

正在加载...

研招资料 -

正在加载...

知识要闻-

正在加载...

国际动态-

正在加载...

会议中心-

正在加载...

学术指南-

正在加载...

学术站点-

正在加载...