Temat: Tectona grandis - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Comparative analysis of mineral elements of green and withered brown leaves of Tectona grandis Linn in Nigeria
Autorzy:: Adetola, O. O.
Powiązania:: https://bibliotekanauki.pl/articles/1059536.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Antinutritional Factors
Mineral nutrients
Tectona grandis
Opis:: Plant mineral elements play a special role in the maintenance of good health. Nigeria is rich in natural wealth and there is an ample scope to explore mineral constituents from the plant kingdom. Teak is an exotic tree in Nigeria but easily grows on almost all soil types in the country. This research aimed at comparatively investigating the macro nutrient status of both withered brown leaf and green leaf of teak from Onigambari plantation. The result of the analysis shows that Green T. grandis leaves contains Sodium 0.488/48.8%,Calcium 0.162/16.2%, Magnesium 0.034/3.4%, Potassium 0.065/6.5% and phosphorus 0.0006/0.06% respectively while the withered brown leaves contains Sodium 0.488/48.8%, Calcium 0.174/17.4%, Magnesium 0.034/3.4%, Potassium 0.046/4.6% and phosphorus 0.005/0.5% respectively. Also the trace elements contents of Green T. grandis leaves contains Iron 0.41/41%, Copper 0.067/6.7%, Manganese 0.010/1%, Zinc 0.005/0.5%, Lead 0.004/0.4%, Chromium 0.002/0.2%, Cadmium 0.00002/0.002% respectively. While the Withered brown T. grandis contains Iron 0.53/53%, Copper 0.064/6.4%, Manganese 0.014/1.4%, Zinc 0.006/0.6%, Lead 0.003/0.3%, Chromium 0.003/0.3%, Cadmium 0.0001/0.01% respectively. The result of this analysis shows that withered T. grandis leaves is a good source of iron, however both Green and withered T. grandis leaves are good sources of Na, Ca, Fe and Cu. The result also shows that both samples are non toxic due to the low amount of lead.
Źródło:: World Scientific News; 2019, 128, 2; 426-432
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Statistical relationship between leaf litter and tree growth characteristics of Tectona grandis species
Autorzy:: Eguakun, F. S.
Job, M.
Powiązania:: https://bibliotekanauki.pl/articles/1112678.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Correlate
Forest
Litter
Nutrient
Productivity
Tectona grandis
Opis:: Forest productivity relies on the quantity and quality of litter as this influences nutrient cycling in the ecosystem. Many studies have been carried out on litter fall, but few attempts has been made to relate litter fall nutrient content with tree growth variables The aim of this work was to investigate basic relationships between the leaf litter nutrient content of Tectona grandis and tree growth characteristics. The study was done at the arboretum of the Department of Forestry and Wildlife Management, University of Port Harcourt, Rivers State, Nigeria. Data were collected from four (4) randomly selected 20m × 20m (0.04ha) plots. Within each plots, four (4) litter traps at 8m apart was set at random to collect litter on a weekly basis, while tree growth variables were measured on trees around the trap. The collected litter was put into zip-lock bags and taken to the laboratory for nutrient content analysis. Nitrogen (N), phosphorus (P), potassium (K), calcium (Ca), sodium (Na), magnesium (Mg) content and pH were included in this. The result shows that the average weekly leaf litter collected from the trap was 11.8g. In terms of average nutrient content, Nitrogen had the highest average at 1.8, while Sodium (Na) had the lowest value at 0.14. Among the tree growth variables, only height had a positive correlation with litter collected. The results also show that Nitrogen micronutrient content was related to the amount of litter collected (0.536). In addition, all the exchangeable base analysed in the study were also related to the amount of litter collected. Conclusively, the amount of litter produced is a major indicator of primary productivity because as litter quantity increases, available nutrient content for plant growth also increases, hence, having influence on tree height.
Źródło:: World News of Natural Sciences; 2018, 18, 2; 252-261
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 3.

Tytuł:: Forecasting carbon sequestered in leaf litter of Tectona grandis species using tree growth variables
Autorzy:: Eguakun, F. S.
Abraham, G. B.
Powiązania:: https://bibliotekanauki.pl/articles/1177778.pdf
Data publikacji:: 2018
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Carbon
Correlate
Equations
Forest
Litter
Sequestration
Significant
Tectona grandis
Opis:: Forests have several pools that acts as carbon sink to atmospheric carbon which is released by anthropogenic causes. Leaf litter is one of those very important pools whose role in nutrient cycling and carbon sequestration cannot be overemphasized. This study was conducted to develop equations for carbon stored in leaf litter of Tectona grandis using tree growth characteristics as explanatory variables. Data was collected from four 20 m × 20 m sample plots which were randomly selected. Within each plots, four litter traps were set to collect leaf litter on a weekly basis. The collected litter was further taken to the laboratory for carbon analysis. The tree growth variables measured in the plots were processed into suitable form for statistical analyses using descriptive statistics in form of tables, charts and graphs and inferential statistics using correlation and regression analysis. Different equation were developed and tried with different tree growth characteristics with a view to select the best equation among the simulated ones. The equation with a highest coefficient of determination (R2) and lowest standard error of estimate (SEE) was selected as the best fit. The average leaf litters produced per day ranged from 2.26g/m2 to 7.67g/m2, the maximum and minimum values of carbon stored in the studied species was 63%, 59% respectively. All the tried equations were significant and fit the data set well. The result showed that the logarithm equation has the highest R2 and lowest SEE values and was therefore selected as the best model. Result from the validated models showed that all tried equations except the exponential equation were good for prediction. Conclusively, the ability of the forest to sequester carbon is a function of the biomass production which is linked to the litter fall produced by the system. Since litter fall represent a major flux for the transfer of carbon and other nutrients between the vegetation and soil, it should therefore not be altered in order not to have an effect on below ground processes. Even though the scope of this study only covers a very small area and sample of the Nigeria forest, it is still very important for prediction of leaf litter carbon and hence, served as a tool for sustainable forest management.
Źródło:: World Scientific News; 2018, 100; 197-212
2392-2192
Pojawia się w:: World Scientific News
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 4.

Tytuł:: Charcoal production: A promoter of deforestation in Nigeria
Autorzy:: Isese, M. O. O.
Powiązania:: https://bibliotekanauki.pl/articles/1076595.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Bombax buonopozense
Charcoal production
Deforestation
Ficus sur
Forest degradation
Khaya ivorensis
Tectona grandis
Tree plant
Vitellaria paradoxa
greenhouse gases
Opis:: Charcoal production in Nigeria is a growing source of concern for government and forestry institutions because of its perceived impact on the environment. The agreed impact is deforestation, i.e., the clearance of indiscriminate cutting of forest trees. Forest degradation associated with charcoal production is difficult to monitor and overlooked and under-represented in forest cover change and carbon emission estimates. Emissions of greenhouse gases a consequence of deforestation from charcoal production in tropical ecosystems in 2009 are estimated at 71.2 million t for carbon dioxide and 1.3 million t for methane. Trees used for charcoal production are Vitellaria paradoxa, Ficus sur, Tectona grandis, Khaya ivorensis, Bombax buonopozense just to mention a few. This review aims to further discredit the act of indiscriminate forest tree falling for charcoal production which have proofed by various works as a promoter of deforestation.
Źródło:: World News of Natural Sciences; 2019, 27; 1-10
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 5.

Tytuł:: Tree basal area models and density for selected plantation species in swamp forest zone of Rivers State, Nigeria
Autorzy:: Oyebade, B. A.
Eguakun, F. S.
Duru, B. N.
Powiązania:: https://bibliotekanauki.pl/articles/1031907.pdf
Data publikacji:: 2021
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Entandrophragma angolense
Khaya ivorensis
Nauclea diderrichii
Tectona grandis
Terminalia ivorensis
Treculia africana
basal area
management
modeling
stand density
Opis:: Individual-tree models of basal area growth and density were developed for seven plantation species in swamp forest zone of Rivers State, Nigeria. Tree growth data were collected from pure permanent sample plots of seven plantation species within the study area with measurements of diameter at breast height (cm), diameter at the base (cm), total height of tree (m), and also the number of tree per plot was taken and obtained from plantation records. The Quantitative data collected from these selected plantation species were subjected to descriptive analysis, correlation and regression analyses. Linearized models for description of relationship between BA and other growth attributes were developed. The results of the major growth variables by species in the study area showed that Treculia africana has the highest dbh mean value 30.804 ±2.031 (cm) with density 0.0022 and basal area per hectare 1.79×10–4 (m2). Similarly, the results also showed that Nauclea dedirrichii has the lowest dbh mean value 08.484 ±0.339 (cm) with basal area 3.92×10–5 (m2) and density 0.0063 per hectare. The results of correlation analyses showed general associations between basal area and the growth attributes by species with coefficients of correlation ranging from –0.023 to 0.999. The results similarly revealed distinct variations by species in density, basal area and tree number in the study area. The results of relationship between basal area and other growth variables showed significant model fit (best fit) with diameter attributes with model order: LNBA = b0 + b1lnDb + b2Dbh2 in Enthandrophragma angolense (R2 - 0.964, RSME – 0.837). The results of the study revealed that there were significant variations in the growth attributes by species in the study area; with significant associations between the basal area and major growth variables evaluated in the study, while the selected best adjudged fit model in the study area could be reasonably used for predicting basal area which is critical in cubical volume estimation and sustainable management of the study area.
Źródło:: World News of Natural Sciences; 2020, 30, 2; 271-286
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 6.

Tytuł:: The study of colour changes of chosen species of wood from Southeast Asia caused by transparent coatings and exposure to sunlight
Badanie zmian barwy wybranych gatunków drewna z Azji Południowo-Wschodniej spowodowanych transparentnymi powłokami i oddziaływaniem światła słonecznego
Autorzy:: Jankowska, A.
Szczesna, M.
Powiązania:: https://bibliotekanauki.pl/articles/52372.pdf
Data publikacji:: 2011
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:: colour change
wood species
Asia
exotic wood
Intsia bijuga
Koompassia malaccensis
Tectona grandis
wood colour
wood coating
sunlight
sunlight exposure
Opis:: In recent years the interest in exotic wood species has been increasing, which was caused by these species’ specific properties. The aesthetic effect of the material, especially the colour, is the most important aspect. Unfortunately, wood is susceptible to strong discolouration caused by the coating process or exposure to sunlight. This paper describes the influence of these factors on the colour stability of Asian teak, merbau and kempas wood species that are mainly used for flooring. It was proved, using spherical spectrophotometer, that uncoated wood became darker when exposed to the action of varnishes and sunlight. Lacquering, waxing and shellac lacquering of wood does not protect it against discolouration, but makes the colour more even on the whole surface.
W ostatnich latach widoczna jest rosnąca popularność drewna egzotycznego na rynku europejskim. Podłogi wykonane z drewna egzotycznego zmieniają swoją barwę pod wpływem czynników zewnętrznych. W opisach barwy drewna egzotycznego w literaturze fachowej brak danych, pozyskanych nie organoleptycznie, lecz za pomocą kolorymetrów fizycznych. Celem niniejszej pracy było zbadanie, przy użyciu spektrofotometru sferycznego, zmian barwy wybranych gatunków drewna z Azji Południowo-Wschodniej (tik, merbau, kempas) z naniesionymi transparentnymi powłokami pod wpływem działania światła słonecznego. Analizę zmiany barwy wykonano na podstawie matematycznego modelu przestrzeni barw CIE L*a*b*, opracowanego przez Międzynarodową Komisję Oświetleniową, uwzględniającego zalecenia zawarte w normie PN-ISO 7724-3:2003. Wyniki przeprowadzonych badań pozwalają stwierdzić, że transparentne powłoki (lakiery, wosk, politura) i ekspozycja na działanie światła słonecznego powodują zmiany barwy drewna. Zmiany barwne mają zróżnicowany charakter dla badanych gatunków drewna, a wielkość zmian jest zależna od zastosowanego środka uszlachetniającego. Większą zmienność barwy wykazuje drewno, które zostało pokryte powłokami niż drewno niczym niezabezpieczone. Lakierowanie, woskowanie i politurowanie drewna generalnie nie zabezpiecza go przed zmianami barwy, jednak wyrównuje jego kolorystykę (barwa drewna jest wyrównana na całej powierzchni).
Źródło:: Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2011, 54, 185
1644-3985
Pojawia się w:: Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:: Biblioteka Nauki

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