Temat: chemical diversity - Katalog OPAC zbiorów

Skocz do pozycji: 1.

Tytuł:: Element content of Scots pine (Pinus sylvestris L.) stands of different densities
Autorzy:: Skonieczna, J.
Malek, S.
Polowy, K.
Wegiel, A.
Powiązania:: https://bibliotekanauki.pl/articles/52511.pdf
Data publikacji:: 2014
Wydawca:: Sieć Badawcza Łukasiewicz - Instytut Technologii Drewna
Tematy:: element content
Scotch pine
Pinus sylvestris
stand
different density
chemical diversity
nutrient
heavy metal
woody biomass
bark
branch
needle
Opis:: Modern forestry management should be based on the principle of sustainability.In order to preserve habitat productivity, the amount of nutrients removed from the environment along with forestry products must be taken into consideration. This study shows the exact concentrations of chemical elements in different tree parts of Scots pine, growing on poor soils in north-western Poland. The observedvalues were compared to the values found in literature. In addition, the relationship between the concentrations of elements and stem diameter or stand density was researched. The highest concentration of chemical elements was observed in the needles (C, N, P, K, Mg, S, Mn, Na, Fe) and the lowest (C, N, P, S, Cu, Na, Ni, Pb, Zn, Fe) in the stem wood. Most of the macronutrients (P, K, Ca, Mg and S) reached optimal values, with the exception of N showing a deficiency, especially in the needles. The relationship between the content of elements and DBH or stand density was rather weak, and in both cases, negative.
Źródło:: Drewno. Prace Naukowe. Doniesienia. Komunikaty; 2014, 57, 192
1644-3985
Pojawia się w:: Drewno. Prace Naukowe. Doniesienia. Komunikaty
Dostawca treści:: Biblioteka Nauki

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Skocz do pozycji: 2.

Tytuł:: Phytoplankton Diversity and Abundance in Relation to Physico-chemical Parameters of Ifewara Reservoir, Southwestern Nigeria
Autorzy:: Hameed, I. O.
Adeniyi, I. F.
Adesakin, T. A.
Aduwo, A. I.
Powiązania:: https://bibliotekanauki.pl/articles/1076734.pdf
Data publikacji:: 2019
Wydawca:: Przedsiębiorstwo Wydawnictw Naukowych Darwin / Scientific Publishing House DARWIN
Tematy:: Phytoplankton abundance
distribution
diversity
physico-chemical parameter
Opis:: The phytoplankton abundance and physico-chemical parameters of Ifewara Reservoir, Southwestern Nigeria was studied for four months (February to December, 2015). Four sampling stations (designated Stations 1-4) were established along the horizontal axis of the reservoir - from inflow region to the dam site end. At each station, net plankton samples were collected by sieving 30 litres of water through a plankton net of 50 µm mesh size into 30 ml concentrate volume. These were then preserved in 5% formalin solution and later treated with Lugol’s solution and reduced to 3 ml for microscope observation. The results of the physico-chemical parameters showed that some were above recommended limits of the National Environmental Standards and Regulations Enforcement Agencies (NESREA) for drinking water and aquatic life. Sixty-nine (69) species of phytoplankton were recorded from the four investigated sampling stations. The abundance of phytoplankton was in the following order; Bacillariophyceae (90.84%) > Chlorophyceae (44.67%) > Cyanophyceae (10.69%) > Charophyceae (0.31%) > Euglenophyceae (0.12%) > Dinophyceae (0.06%) > Chrysophyceae (0.03%). The most abundant phytoplankton species was Fragilaria aceania, accounting for 74.28% of the total, followed by Cosmarium quadrum (13.04%), Rhizoclonium hieroglyphicum (11.97%) and Oscillatoria tenuis (8.03%). With regard to the horizontal pattern of variation along the reservoir, the highest phytoplankton abundance was recorded at the inflow basin and the lowest abundance at the dam site. Almost all the phytoplankton groups also had their highest mean abundance during the rainy season rather then during the dry season.
Źródło:: World News of Natural Sciences; 2019, 24; 250-267
2543-5426
Pojawia się w:: World News of Natural Sciences
Dostawca treści:: Biblioteka Nauki