搜索结果: 136-150 共查到“农学 Forest”相关记录692条 . 查询时间(0.112 秒)
Effect of the skid trail cross section and horizontal alignment on forest soil physical properties
soil bulk density ground-based skidding cross slope Civil3D software Bahramnia forest
2017/6/26
Horizontal alignment and cross section characteristics of a skid trail in a ground-based skidding system including curves, wheel ruts and cross slope can impact on the forest soil. In this study the m...
Impact of logging intensity on stem density, basal area and biodiversity indices five years after logging in a Caspian hardwood forest
harvesting intensity forest biodiversity northern Iran
2017/6/26
The aim of the present study was to analyse the impacts of different logging intensities after five years from logging including non-logged, low (3.4 felled stems per hectare), medium (5.2 felled stem...
Ecological functions of vegetation as potentials of ecosystem services (floodplain alder forest in the Tríbeč microregion)
biomass black alder forest herbaceous understorey provisioning and production services
2017/4/6
Ecological functions of a black alder riparian forest (Aegopodio-Alnetum glutinosae) as capacities for the provision of ecosystem services were analysed and indicated by an inductive (bottom-up) appro...
Dust contributes valuable nutrients to Sierra Nevada forest ecosystems
Dust contributes valuable nutrients Sierra Nevada forest ecosystems
2017/3/30
But dust from as close as California's Central Valley and as far away as Asia's Gobi Desert provides nutrients, especially phosphorus, to vegetation in the Sierra Nevada Mountains, a team of scientist...
Evaluation of forest fire risk using the Apriori algorithm and fuzzy c-means clustering
wildfire association rules fuzzification Ilam Province Iran
2018/3/6
In this study we evaluated forest fire risk in the west of Iran using the Apriori algorithm and fuzzy c-means (FCM)
clustering. We used twelve different input parameters to model fire risk in Ilam Pr...
Research on forest terrain roughness as a source of dynamic action on the vehicle
forest soils micro-profile correlation analysis power spectral density
2018/3/6
The issue of terrain conditions is very complex and its description is approached from different perspectives and with
different objectives. Because it consists of the gathering of basic information ...
Forest density and orchard classification in Hyrcanian forests of Iran using Landsat 8 data
canopy cover Caspian forests satellite data supervised classification support vector machines two-stage sampling
2018/3/6
Satellite-based remote sensing is of crucial importance to provide timely and continuous thematic maps for practical
forestry tasks. There is currently no existing remote sensing-based, large-scale i...
Estimation of diameter at breast height from mobile laser scanning data collected under a heavy forest canopy
mobile mapping system clustering point cloud circle fit
2018/3/6
Mobile laser scanning (MLS) is time-efficient technology of geospatial data collection that proved its ability to provide
accurate measurements in many fields. Mobile innovation of the terrestrial la...
Innovative approaches in forest management – the application of a business model to designing a small-scale forestry strategy
resources innovation rural economy competitive advantage business opportunities extended business model CANVAS
2018/3/6
The strong market competition forces forest owners to find innovative approaches to forest management, and business
models are becoming integral parts of successful innovations and business strategie...
Evaluation of transformation from even-aged to selection forest by means of Gini index
stand transformation selection system structural indices forest management
2018/3/6
We used the Gini index for evaluation of the 40-year transformation to selection forests in the Training Forest Enterprise
Masaryk Forest Křtiny (Czech Republic). The Gini index values for parti...
Efficiency of sector sampling for estimating juniper forest attributes vs. fixed area plot
accuracy crown cover density precision plot shape
2018/3/6
Juniper forests grow in mountain areas and many difficulties are encountered in their sampling. Sector sampling as
an unbiased and cost-effective method was tested for the sampling of a 12.5-ha junip...
Monitoring geometric properties of an existing forest road using airborne Lidar data
vertical profile cross section horizontal profiles total station roadbed
2018/3/6
Accurate information about geometric properties of a forest road is essential for the sustainable forestry and transportation
safety. In this study the ability of airborne Lidar in detecting vertical...
Evaluating the effect of biological stabilization on landslide control at the edge of forest road
sliding area stabilized area alder trees soil mechanics benchmarking
2018/3/6
Landslide is one of the negative sides of building non-standard roads in forest areas. The aim of the present study
was to assess the effect of biological stabilization on landslide at the edge of fo...
Comparison of different erosion control techniques in the Hyrcanian forest in northern Iran
best management practices runoff skid trail soil loss water bar
2018/3/6
The aim of this study was to evaluate the effects of closure best management practices (BMPs) on runoff volume and
soil loss on skid trails that received two densities of soil cover mats and were loc...
Analysis of biomass in young Scots pine stands as a basis for sustainable forest management in Czech lowlands
nutrients nutrient-poor sites Pinus sylvestris L. crown stem roots
2018/3/6
Scots pine covers large areas on sandy soils in lowlands of the Czech Republic. These sites can be threatened by nonsustainable
biomass removal after clear-cutting. Totally 14 young pine stands at 14...