scholarly journals Gas exchange and organic substance production of Scots pine (Pinus silvestris L.) seedlings grown in soil cultures with ammonium or nitrate form of nitrogen

2015 ◽  
Vol 43 (1) ◽  
pp. 103-116 ◽  
Author(s):  
J. Zajączkowska
Keyword(s):  
Organic Matter ◽  
Gas Exchange ◽  
Chlorophyll A ◽  
Organic Substance ◽  
Pinus Silvestris ◽  
Organic Substances ◽  
Respiration Rates ◽  
Organic Matter Accumulation ◽  
Pine Seedlings ◽  
Chlorophyll A And B

Scotts pine seedlings were grown in soil cultures with a known content of N and C as well as organic substances. Walter solutions of the following salts: NaNO<sub>3</sub>, (NH<sub>4</sub>)<sub>2</sub>SO<sub>4</sub>, NH<sub>4</sub>Cl, NH<sub>4</sub>NO<sub>3</sub>, NH<sub>4</sub>HCO<sub>3</sub> were used as a source of nitrogen in particular nutritional variants. Organic matter accumulation in particular organs as well as the chlorophyll a and b content were determined, photosynthetic and respiration rates were also measured. It was found that differences in gas exchange and organic matter accumulation of seedlings grown on ammonium or nitrate form of nitrogen are similar in plants from water cultures as well as in those from soil cultures.

scholarly journals Gas exchange and organic matter production of Scots pine (Pinus sihestris L.) seedlings grown in water culture with ammonium or nitrate form of nitrogen

2015 ◽  
Vol 42 (4) ◽  
pp. 607-615 ◽  
Author(s):  
J. Zajączkowska
Keyword(s):  
Organic Matter ◽  
Gas Exchange ◽  
Scots Pine ◽  
Organic Substance ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Organic Matter Production ◽  
Matter Production ◽  
Photosynthesis And Respiration

he reaction of Scots pine (<i>Pinus silvestris</i> L.) seedlings to ammonium and nitrate form of nitrogen was investigated. Rates of photosynthesis and respiration, content of chlorophylls, and accumulation of organic substance were determined in 12 and 18 weeks old plants. The results have shown, that the forms of nitrogen does affect the amount of accumulated organic substance as well as its distribution in particular organs.

Nonrandom variation of gas exchange within arctic lichens

1980 ◽  
Vol 58 (10) ◽  
pp. 1181-1186 ◽  
Author(s):  
Thomas H. Nash III ◽  
Thomas J. Moser ◽  
Steven O. Link
Keyword(s):  
Gas Exchange ◽  
Chlorophyll A ◽  
Vertical Profile ◽  
Laboratory Studies ◽  
Gross Photosynthesis ◽  
Chlorophyll A And B ◽  
Photosynthesis And Respiration ◽  
Cladonia Rangiferina

Nonrandom variation in gas exchange of the three arctic lichens Cladonia rangiferina (L.) Wigg., Cladonia stellaris (Opiz) Brodo, and Parmelia separata Th. Fr. is documented through a combination of field and laboratory studies. The highest rates of both photosynthesis and respiration occur in the youngest, actively growing sections of the thalli and both parameters decrease progressively into the older sections. For the two Cladonia species gross photosynthesis is shown to vary directly as a function of chlorophyll a and b concentration as found in a vertical profile through the lichen mat.

scholarly journals Effect of root aeration and form of nitrogen on photosynthetic productivity of Scots pine (Pinus silvestris L.)

2015 ◽  
Vol 46 (2) ◽  
pp. 303-316 ◽  
Author(s):  
Andrzej Łotocki
Keyword(s):  
Organic Matter ◽  
Dry Weight ◽  
Growing Season ◽  
Pinus Silvestris ◽  
Water Culture ◽  
Photosynthetic Productivity ◽  
Pine Seedlings ◽  
Rate Of Photosynthesis ◽  
Photosynthesis And Respiration ◽  
Root Aeration

The response of 1-year old pine seedlings, grown in sand and water culture, to nutrition with nitrate or ammonium form of nitrogen, as well as to various aeration of the cultures was studied. Measurements of photosynthesis and respiration were carried out. Production of organic matter and its distribution to particular organs were determined. Seedlings supplied with NH<sub>4</sub>Cl were characterized by smaller contribution of root dry weight to the total weight of the plant. Poor aeration (heavy watering) of seedlings supplied with ammonium chloride caused a decrease in the rate of photosynthesis. Plants supplied with NH<sub>4</sub>C1 did not show the typical decrease of photosynthetic rate at the end of the growing season.

scholarly journals Impact of technogenic pollution on the pigment composition of birch leaves (Betula pendula Roth) in the urban conditions of Barnaul

2020 ◽  
Vol 19 (1) ◽  
pp. 223-228
Author(s):  
G. G. Sokolova
Keyword(s):  
Chlorophyll A ◽  
Betula Pendula ◽  
Growing Season ◽  
Protective Mechanism ◽  
Chlorophyll B ◽  
Organic Substances ◽  
Pigment Composition ◽  
Chlorophyll A And B ◽  
High Level ◽  
Urban Conditions

The article considers the results of analysis of photosynthetic pigments сcontent (chlorophyll a, chlorophyll b, carotenoids) in birch leaves growing along the roads of Barnaul. High level of pollution causes decrease inamount of chlorophyll a and b and a change in chlorophyll a/b ratio. Carotenoids act as a protective mechanism againstthe destruction of chlorophyll a molecules and organic substances. Their number increases during the growing season.

scholarly journals Chlorophyll content in pine (Pinus silvestris L.) needles exposed to flue dust from lead and zinc works

2015 ◽  
Vol 45 (4) ◽  
pp. 411-419
Author(s):  
M. Świeboda
Keyword(s):  
Chlorophyll Content ◽  
Chlorophyll A ◽  
Pinus Silvestris ◽  
Scotch Pine ◽  
Flue Dust ◽  
Lead And Zinc ◽  
Chlorophyll A And B

Chlorophyll a and b, sulphur, zinc and lead contents were determined in annual and biennial needles of Scotch pine (<i>Pinus silevstris</i> L.) exposed to flue dust-polluted air. Intoxication indexes were calculated on the basis of the obtained results.

scholarly journals Changes in the chlorophyll a and b content in different-aged leaves of Spergula vernalis Willd.

2015 ◽  
Vol 43 (2) ◽  
pp. 235-241
Author(s):  
Ewa Symonides
Keyword(s):  
Organic Matter ◽  
Chlorophyll A ◽  
Seasonal Variations ◽  
Habitat Conditions ◽  
Chlorophyll A And B ◽  
Green Pigments

The result are reported of investigations on the seasonal variations in the chlorophyll a and b content in the successive leaf tiers of <i>Spergula vernalis</i> Willd. growing in two different dune habitats. It was endeavoured to determine the influence of habitat conditions on the concentration of green pigments. The eventual relationship between their amount and the production of organic matter by the plants is discussed.

Characteristics of fouling due to clay-organic substances in potable water treatment by ultrafiltration

1996 ◽  
Vol 34 (9) ◽  
pp. 157-164 ◽  
Author(s):  
Kim C.-H. ◽  
M. Hosomi ◽  
A. Murakami ◽  
M. Okada
Keyword(s):  
Molecular Weight ◽  
Organic Matter ◽  
Humic Acid ◽  
Fulvic Acid ◽  
Size Distribution ◽  
Ultrafiltration Membrane ◽  
Organic Substances ◽  
Decomposition Products ◽  
Microbial Decomposition ◽  
Fouling Materials

Effects of clay on fouling due to organic substances and clay were evaluated by model fouling materials and kaolin. Model fouling materials selected were protein, polysaccharide, fulvic acid, humic acid and algogenic matter (EOM:ectracellular organic matter, microbial decomposition products) and kaolin was selected as the clay material. Polysulfone membrane (MWCO(Molecular Weight Cut-Off) 10,000, 50,000 and 200,000) was used as an ultrafiltration membrane. In particular, the flux measurement of solutions containing algogenic matter used an ultrafiltration membrane of MWCO 50,000. The flux of protein and polysaccharide with coexistence of kaolin increased in the case of the ratio of MW/MWCO being greater than one, but did not increase in the case of the MW/MWCO ratio being below one. In contrast, the flux of fulvic acid and humic acid with coextence of kaolin decreased regardless of the ratio of MW/MWCO. The addition of dispersion agent and coagulant in the organic substances and kaolin mixture solution changed the size distribution of kaolin, and resulted in a change of the flux. EOM and microbial decomposition products decreased with the increase of the fraction of organic matter having molecular weight more than MWCO of membrane. The flux of the algogenic organic matter with coexistence of kaolin decreased with the increase of the amount of kaolin. It was suggested that the decline of the flux with coexistence of kaolin was due to the change of the resistance of the kaolin cake layer corresponding to the change in kaolin size distribution with charge.

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