搜索结果: 136-150 共查到“林学 Forest”相关记录643条 . 查询时间(0.136 秒)
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...
Forest canopy density assessment using different approaches – Review
satellite sensors vegetation index classification methods pixel based spectral analyses
2017/4/6
Crown canopy is a significant regulator of forest, affecting microclimate, soil conditions and having an undeniable role in a forest ecosystem. Among the different materials and approaches that have b...
Prevalence of burnout among forest workers in Mazandaran, Iran
Maslach Burnout Inventory emotional exhaustion personal accomplishment psychological stress
2017/4/6
Burnout imposes consequences and costs on the organization and employees, such as frequent job and workplace replacement, frequent absenteeism and permissions, and reduced work quantity and quality. S...
Impact of plot size and model selection on forest biomass estimation using airborne LiDAR: A case study of pine plantations in southern Spain
airborne laser scanning forest inventory regression survey design genetic selection methods
2017/4/6
We explored the usefulness of LiDAR for modelling and mapping the stand biomass of two conifer species in southern Spain. We used three different plot sizes and two statistical approaches (i.e. stepwi...
How Much Drought Can a Forest Take?
Drought Forest
2017/2/16
Why do some trees die in a drought and others don’t? And how can we predict where trees are most likely to die in future droughts?Scientists from the University of California, Davis, and colleagues ex...
Introduction of suitable species for planting in gaps of different size (case study: Loveh forest, Golestan, Iran)
canopy gap length of spring shoots mean annual increment of diameter mean annual increment of height seedling
2017/4/6
This study was carried out in Loveh forest, north of Iran. We measured the quantitative characteristics of seedlings including collar diameter (measured at 1 cm above the soil surface), height, and cu...