搜索结果: 106-120 共查到“知识库 森林保护学”相关记录559条 . 查询时间(2.277 秒)
Impact of risk factor management on the sanitary condition of Norway spruce (Picea abies [L.] Karst.) pure stands in Latvia
compartment location compartment shape
2015/5/5
In management of young forest stands, it is often the case in forestry that several risk factors, biotic,
abiotic and anthropogenic ones, have to be dealt with. An anthropogenic factor is of great i...
Results of 20 years old Douglas-fir provenance experiment established on the northern slopes of Rila Mountain in Bulgaria
Pseudotsuga menziesii introduction
2015/5/5
The purpose of this study is to facilitate the detection of provenances relevant to the reforestation practice
in Bulgaria. Studies were carried out in a Douglas-fir provenance trial plantation esta...
Infl uence of forest fragmentation on the distribution of small terrestrial mammals in fi r-beech commercial forest
Apodemus flavicollis Clethrionomys glareolus
2015/5/5
Differences in abundance and spatial distribution of small terrestrial mammals were compared between
the forest interior and clearing. In total, seven micromammalian species were detected. Of them, ...
Litterfall and leaf decomposition in Nothofagus pumilio forests along an altitudinal gradient in Tierra del Fuego, Argentina
litter microclimate nitrogen phosphorus
2015/5/5
To achieve a fuller understanding of forest ecosystem functioning, it is necessary to know decomposition
dynamics. The objective of this study was to quantify litter production, decomposition and mi...
Forest management and snag characteristics in Northern Iran lowland forests
biodiversity broadleaved forests
2015/5/5
Some snag characteristics were studied in three different Hyrcanian lowland forests. The highest snag
density (38.4 stem·ha–1) was found in fully protected forests, and it was significantly higher t...
Forest fires and their causes in the Czech Republic (1992–2004)
fire risk preventive measures occurrence burnt area season frequency
2015/4/24
Forest fires under conditions of the Czech Republic are evaluated from the aspect of their frequency of occurrence in 1992–2004 at a level of particular years, seasons, days and daytime, and causes of...
Assessment of coarse woody debris following selective logging in Caspian forests: implications for conservation and management
line intersect method fixed-area plot beech forest
2015/4/24
Information on the amount, distribution, and characteristics of coarse woody debris (CWD) in forest ecosystems is highly demanded by wildlife biologists, fire specialists and ecologists. Owing to its ...
Earthworm biomass and abundance, soil chemical and physical properties under different poplar plantations in the north of Iran
soil properties populus clones populus caspica organic carbon poplar
2015/4/24
We evaluated earthworm abundance and biomass in plantations of different poplar species and clones as well as the effect of some soil chemical and physical properties on them. Even-aged poplar species...
Spatial-temporal distribution of forest fires and fire weather index calculation from 2000 to 2009 in China
Sanming spatial-temporal distribution CFFDRS
2015/4/24
This paper describes the forest fire dynamics in the city of Sanming in Fujian province, China, from 2000 to 2009 with a view to understand the number of fires and burned areas in different counties. ...
The influence of deforestation on runoff generation and soil erosion (Case study: Kasilian Watershed)
forest landuse runoff-rainfall model sediment Iran
2015/4/24
Destroying of forest lands and landuse changes have caused undesirable effects in the watershed hydrologic conditions. Landuse and vegetation are important factors in soil erosion and runoff generatio...
Prosperity of Douglas fir (Pseudotsuga menziesii [Mirb.] Franco) plantations in relation to the shelter
forest regeneration clear-cut area size
2015/4/24
The study evaluates the mortality, growth and qualitative characteristics of Douglas fir transplants planted out on clear-cut areas with different shelter. We assessed 11 clearings situated in the For...
Attractiveness of Picea pungens to the bark beetle species Ips amitinus (Eichh.) and Pityogenes chalcographus (L.)
Kruš né hory Mts Picea alba
2015/4/24
Only two cambioxylophagous species (Ips amitinus and Pityogenes chalcographus) were found on sections of Picea pungens and Picea abies that belong to economically important pests of Norway spruce. Rep...
东北农林交错区土地利用景观及生态服务价值变化
农林交错区 景观变化 生态服务价值 驱动力
2016/12/21
分析东北农林交错区土地利用景观及其生态环境效应的变化特征,为区域内资源利用和生态环境保护提供科学依据. [方法] 采用景观生态学理论和3S技术等理论方法,以1991—2013年4个时间点的遥感影像为数据源,通过景观指数计算和模型分析,得到22 a间土地利用景观格局和生态服务价值的演变特征,并对其驱动力进行探讨. [结果] 在1991—2013年,景观指数普遍经历"V"或"Λ"型的变化过程,景观形状...
Factors affecting the development of Phytophthora alni ssp. alni infections in Alnus glutinosa L.
Alnus glutinosa black alder Phytophthora alni subsp alni infection experiment natural infection seasonal variation
2015/4/14
Phytophthora alni is responsible for a devastating disease in alder and changes in the environment of riparian and alder carr ecosystems. One of the main approaches to solve this problem is to find na...
Operational monitoring of the nun moth Lymantria monacha L. (Lepidoptera: Lymantriidae) using pheromone-baited traps – a rationalization proposal
Lepidoptera Lymantria monacha Pinus sylvestris monitoring method forest pest forest protection
2015/4/14
The annual risk assessment of Scots pine (Pinus sylvestris L.) stands in the federal state of Brandenburg and subsequent decisions on the application of insecticides are based on operational surveilla...