SURFACE AREA RELATIONS OF WOODY PLANTS AND FOREST COMMUNITIES

1967 ◽  
Vol 54 (8) ◽  
pp. 931-939 ◽  
Author(s):  
R. H. Whittaker ◽  
G. M. Woodwell
Keyword(s):  
Surface Area ◽  
Woody Plants ◽  
Forest Communities

Wyniki oznaczeń taksonomicznych szczątków drewna

2020 ◽  
pp. 105-106
Author(s):  
Grzegorz Skrzyński
Keyword(s):  
Pinus Sylvestris ◽  
Human Activity ◽  
Scots Pine ◽  
Woody Plants ◽  
The Other ◽  
Taxonomic Identification ◽  
Forest Communities ◽  
Widespread Occurrence ◽  
Przeworsk Culture ◽  
High Share

A number of samples collected during exploration of archaeological features from the Przeworsk culture cremation cemetery were submitted for xylological examination. The samples contained poorly preserved charred remains of wood, which were subjected to taxonomic identification. Anthracological analyses allowed four taxa of woody plants to be identified, with the predominant share of remains belonging to Scots pine Pinus sylvestris. The high share of pine wood fragments may indicate selective acquisition of this species as a material for building funeral pyres. On the other hand, it may reflect the widespread occurrence of this species in the nearby forest communities, which were shaped by human activity.

scholarly journals ZONAL FOREST COMMUNITIES AND FOREST ZONING OF WESTERN SIBERIA (RUSSIA)

2018 ◽  
Vol 49 (6) ◽  
Author(s):  
Al A. Myasnikov
Keyword(s):  
Species Composition ◽  
Economic Efficiency ◽  
Woody Plants ◽  
Forest Cover ◽  
Western Siberia ◽  
Economic Assessment ◽  
Forest Resources ◽  
Forest Communities ◽  
Forest Distribution ◽  
The Given

Forests of Siberia are heterogeneous in species composition, productivity, types and nature of renewability. They are also heterogeneous in patterns of forest distribution on different categories of land, marshes, bare mountains, meadows and percentage of forest cover. This research investigates the main types of woody plants and geographical distribution of forest communities in Western Siberia. The forest zoning of Western Siberia was analyzed to reveal the features of zonal formation of forest biogeocenoses. Forest zoning and ecological and economic assessment of the productivity of forest communities within zones and regions make the basis for outlining the strategic priorities in the given territory, and help to develop a system of forestry and timber processing activities aimed to improve ecological and economic efficiency of forest resources.

Leaf area differences associated with old-growth forest communities in the western Oregon Cascades

1976 ◽  
Vol 6 (1) ◽  
pp. 49-57 ◽  
Author(s):  
Henry L. Gholz ◽  
Franklin K. Fitz ◽  
R. H. Waring
Keyword(s):  
Leaf Area ◽  
Surface Area ◽  
Growing Season ◽  
Forest Communities ◽  
Old Growth ◽  
Total Leaf Area ◽  
Old Growth Forest ◽  
Total Leaf ◽  
Oregon Cascades ◽  
Moisture Conditions

Total leaf area varied from 20 to 42 m2/m2 in 250- to 450-year-old forest communities developed under different temperature and moisture conditions. The largest values were in communities at midelevations where winter snowpack accumulated and growing-season temperatures were cool. Shrub and herb leaf area varied from 3% to 14% of the total. Equations for converting from foliage biomass to surface area are included for most species encountered.

Effects of fire seasonality and intensity on resprouting woody plants in prairie‐forest communities

2021 ◽  
Author(s):  
Jed Meunier ◽  
Nathan S. Holoubek ◽  
Yari Johnson ◽  
Tim Kuhman ◽  
Brad Strobel
Keyword(s):  
Woody Plants ◽  
Forest Communities ◽  
Fire Seasonality

Riparian forest communities and their role in nutrient conservation in an agricultural watershed

1987 ◽  
Vol 2 (3) ◽  
pp. 114-121 ◽  
Author(s):  
Joseph L. Fail ◽  
Bruce L. Haines ◽  
Robert L. Todd
Keyword(s):  
Woody Plants ◽  
Riparian Forest ◽  
Test Site ◽  
Riparian Forests ◽  
Nutrient Concentrations ◽  
Agricultural Practice ◽  
Forest Communities ◽  
Production Rates ◽  
Accretion Rates ◽  
Agricultural Areas

AbstractRiparian forests situated adjacent to agricultural uplands were studied to test the hypothesis that riparian forests intercept and utilize nutrients lost from these uplands. Production rates, tissue nutrient concentrations, and nutrient accretion rates of woody plants were compared between sites that were contiguous to agricultural areas (test sites) and sites that were separated from agricultural areas by grass buffer zones (reference sites). Net primary production was 10,344 kg ha–1yr–1, but trees within a riparian forest that received runoff directly from a pigpen (test site) had production rates that were 2.5 times higher than the average for all other sites. Above ground forest nutrient accretion rates were also highest at the pigpen test site. Woody plants in test site forests had, on the average, higher branch wood and leaf nutrient concentrations than plants in reference site forests. The data provide evidence that riparian forest communities within agricultural environments absorb and retain nutrients lost from agricultural uplands. As such they are important components of agricultural ecosystems helping to maintain acceptable stream water quality. It is suggested that ecologically sound agricultural practice should include longterm maintenance of natural riparian vegetation zones within agricultural areas.

Preparation and characterisation of vanadium pentoxide supported rhodium catalyst

1988 ◽  
Vol 46 ◽  
pp. 946-947
Author(s):  
A. Legrouri
Keyword(s):  
Aqueous Solution ◽  
Thermal Decomposition ◽  
Physicochemical Properties ◽  
Surface Area ◽  
Vanadium Pentoxide ◽  
High Purity ◽  
Gas Adsorption ◽  
Rhodium Catalyst ◽  
Optical Methods ◽  
Reducible Oxides

The industrial importance of metal catalysts supported on reducible oxides has stimulated considerable interest during the last few years. This presentation reports on the study of the physicochemical properties of metallic rhodium supported on vanadium pentoxide (Rh/V2O5). Electron optical methods, in conjunction with other techniques, were used to characterise the catalyst before its use in the hydrogenolysis of butane; a reaction for which Rh metal is known to be among the most active catalysts.V2O5 powder was prepared by thermal decomposition of high purity ammonium metavanadate in air at 400 °C for 2 hours. Previous studies of the microstructure of this compound, by HREM, SEM and gas adsorption, showed it to be non— porous with a very low surface area of 6m2/g3. The metal loading of the catalyst used was lwt%Rh on V2Q5. It was prepared by wet impregnating the support with an aqueous solution of RhCI3.3H2O.

Cell morphology, volume, and surface area determinations from multilevel contouring within HVEM micrographs of serial sections and whole-cell mounts

1987 ◽  
Vol 45 ◽  
pp. 588-589
Author(s):  
M. Marko ◽  
A. Leith ◽  
D. Parsons
Keyword(s):  
Surface Area ◽  
Electron Micrographs ◽  
Cell Morphology ◽  
Individual Variation ◽  
Serial Section ◽  
Stereo Pair ◽  
Complex Structures ◽  
Serial Sections ◽  
Surface Areas ◽  
Computer Based

The use of serial sections and computer-based 3-D reconstruction techniques affords an opportunity not only to visualize the shape and distribution of the structures being studied, but also to determine their volumes and surface areas. Up until now, this has been done using serial ultrathin sections.The serial-section approach differs from the stereo logical methods of Weibel in that it is based on the Information from a set of single, complete cells (or organelles) rather than on a random 2-dimensional sampling of a population of cells. Because of this, it can more easily provide absolute values of volume and surface area, especially for highly-complex structures. It also allows study of individual variation among the cells, and study of structures which occur only infrequently.We have developed a system for 3-D reconstruction of objects from stereo-pair electron micrographs of thick specimens.

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