搜索结果: 1-15 共查到“林业基础学科 density”相关记录16条 . 查询时间(0.073 秒)
Effects of Stand Structure and Topography on Forest Vegetation Carbon Density in Jiangxi Province
stand characteristics terrain factor driving force regression analysis
2023/12/11
Stand structure and topography are important factors affecting forest vegetation carbon density (FVCD). Revealing the interaction mechanisms between stand structure and topography on FVCD is of great ...
Adaptive k-tree sample plot for the estimation of stem density: An empirical approach
plotless sampling distance sampling bias efficiency forest sampling
2018/3/6
Available budgets for the inventory of non-commercial woodlands are small. Therefore, there has been increased
interest in using distance methods, such as k-tree sampling, which are faster than fixed...
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...
FOREST CANOPY DENSITY MONITORING, USING SATELLITE IMAGES
Remote Sensing Forestry Change Detection Landsat Multispectral Thermal
2015/7/29
The increasing use of satellite Remote Sensing for civilian use has proved to be the most cost effective means of mapping and
monitoring environmental changes in terms of vegetation and non-renewabl...
An assessment of the applicability of dung count to estimate the wild boar population density in a forest environment
accumulation defecation distribution faeces
2015/5/5
Wild boar is a native species in the fauna of the Czech Republic. It is becoming a problematic game
species both in the Czech Republic and in other European countries due to its harmful impacts. So ...
Long-term response of understorey cover, basal area and diversity to stand density in a mixed oak forest on the Síkfőkút plot in Hungary
Quercus cerris shrub layer Acer campestre Shannon-Wiener index Evenness index shrub foliage cover
2015/4/24
The serious oak decline was reported for the 1979–80 period and 63.0% of adult oaks died in a mixed oak forest in the Síkfőkút site, Hungary. The data were used to obtain (1) quantitative informa...
Variation of wood density in Turkish hazel (Corylus colurna L.) grown in the Czech Republic
Corylus colurna L wood density variability
2015/4/14
The aim of this study was to investigate the wood density of Turkish hazel (Corylus colurna L.), an introduced species in the Czech Republic. Sample trees coming from a Czech site were tested for basi...
Red deer density in the air-polluted area of forest ecosystems in the Krušné hory Mts. – Klášterec nad Ohří Forest District
deer count pellet group red deer
2015/3/27
The density of red deer in the area of forest ecosystems disturbed by air pollution in the Krušné hory Mts. – Klášterec nad Ohří Forest District was determined in two model hunting dist...
Transformation of solar radiation in Norway spruce stands into produced biomass – the effect of stand density
biomass production LAI Norway spruce PAR absorption solar energy conversion
2015/3/27
The present paper is focused on an assessment of the effects of stand density and leaf area development on radiation use efficiency in the mountain cultivated Norway spruce stand. The young even-aged ...
Comparison of deposition fluxes on the open area and in mountain spruce stands of different density
throughfall Norway spruce Moravian-Silesian Beskids Mts
2015/3/16
To better understand the chemical transformation of rainfall after the passage through the canopies it is necessary to study throughfall deposition fluxes within forest stands. The comparison of bulk ...
The influence of stand density on Mn and Fe concentrations in beech leaves
Fagus sylvatica L. leaf concentration iron manganese shelterwood cutting
2015/2/6
A shelterwood system is widely used in forest management practice. Favourable ecological conditions for the growth of desired natural seedlings are provided by a successive canopy reduction. The impac...
Influence of stand density on Zn and Cu concentrations in beech leaves
Fagus sylvatica L. leaf concentration zinc copper shelterwood cutting
2015/2/6
The paper deals with the response of leaves in a beech stand to opening after shelterwood cutting of various intensity (stocking of 0.3, 0.5, 0.7, 0.9) performed in 1989. The research was running in 1...
Native Woody Plants Diversity and Density under Eucalyptus camaldulensis Plantation, in Gibie Valley, South Western Ethiopia
The aim of the study was to assess the impact of E. camaldulensis plantation established in a semi-arid area on native woody plants diversity and density. Nested quadrant plot design, having an area of 15 m × 15 m used to collect data. Totally, 37 species at the plantation and 30 species at the native woodland, belonging to 24 families, identified. Species diversity (H′) was 1.57 at the plantation and 2.09 at the woodland forest. As for density of understory woody plants (height ≥ 1 m) the plantation forest harbored 6, 604 stems/ha while the native woodland had 7, 347 stems/ha. Seedling density (height < 1 m) at the native woodland and at the plantation there were 11,436 stems/ha and 8,865 stems/ha, respectively. The similarity of woody species composition between the woodland forest and the plantation was low. However, in terms of autochthonous tree seed bank availability, authentic hypothesis seems to prove that if clear-cut patches replanted by introduced species that do not exceed 5 ha, they still significantly favour original forest regeneration and composition in a semi-arid area and surprisingly favors the regeneration of Dodonaea angustifolia and other native species important for soil conservation, timber, bee forage and medicinal use.
2013/3/4
The aim of the study was to assess the impact of E. camaldulensis plantation established in a semi-arid area on native woody plants diversity and density. Nested quadrant plot design, having an area o...
Effect of Spatial Scale on Modeling and Predicting Mean Cavity Tree Density: A Comparison of Modeling Methods
CART, Logistic Regression Neural Network Oak Forest Prediction Accuracy
2013/3/4
Cavity trees are integral components of healthy forest ecosystems and provide habitat and shelter for a wide variety of wildlife species. Thus, monitoring and predicting cavity tree abundance is an im...
An Investigation on the Allocation of Selection Weight on Growth and Wood Basic Density to Maximize Carbon Storage in the Stem of Sugi (Cryptomeria japonica D.Don) Plus-tree Clones
carbon storage clone global warming prevention index selection sugi
2009/8/27
An optimum allocation of selection weight on the traits that were related to carbon storage in the stem of sugi was investigated to establish criteria for choosing plus tree clones suitable for carbon...