Nitrogen incorporation by epiphytic algae via Vallisneria natans using 15N tracing in sediment with increasing nutrient availability

2017 ◽  
Vol 80 (1) ◽  
pp. 93-99
Author(s):  
Y Song ◽  
J Wang ◽  
Y Gao ◽  
B Qin
Keyword(s):  
Nutrient Availability ◽  
Epiphytic Algae ◽  
15N Tracing ◽  
Nitrogen Incorporation ◽  
Vallisneria Natans

scholarly journals The Biomass and Physiological Responses of Vallisneria natans (Lour.) Hara to Epiphytic Algae and Different Nitrate-N Concentrations in the Water Column

Water ◽  
2017 ◽  
Vol 9 (11) ◽  
pp. 863 ◽  
Author(s):  
Fenli Min ◽  
Jincheng Zuo ◽  
Yi Zhang ◽  
Qingwei Lin ◽  
Biyun Liu ◽  
...  
Keyword(s):  
Water Column ◽  
Physiological Responses ◽  
Epiphytic Algae ◽  
Nitrate N ◽  
Vallisneria Natans

Seasonal dynamics of epiphytic algal growth in a marsh pond: composition, metabolism, and nutrient availability

1978 ◽  
Vol 56 (19) ◽  
pp. 2441-2448 ◽  
Author(s):  
Nina M. Hooper-Reid ◽  
G. G. C. Robinson
Keyword(s):  
Alkaline Phosphatase ◽  
Phosphatase Activity ◽  
Nutrient Availability ◽  
Alkaline Phosphatase Activity ◽  
Standing Crop ◽  
Artificial Substrates ◽  
Epiphytic Algae ◽  
Available N ◽  
Deficiency Symptoms ◽  
Nutrient Levels

Seasonal growth and succession of epiphytic algae on artificial substrates in a marsh pond were related to nutrient levels (N, P, and Si) and to various physiological indicators of nutrient availability, including chlorophyll content, protein to carbohydrate and lipid ratio, Si debt, storage phosphate levels, alkaline phosphatase activity, and nitrogenase activity. Low standing crops in June and early July coincided with indications of deficiency in terms of chlorophyll a content and protein to carbohydrate and lipid ratios at chosen Scirpus and Potamogeton sites. Low available N may have been limiting growth. In July and August, when available N, P, and Si were low, there was evidence of Si limitation of diatom growth at both sites. Growth of heterocystous, N2-fixing. blue-green algae and high alkaline phosphatase activity occurred in July at the Potanwgeton site. Increased standing crop of epiphytic algae in September and October at the Scirpus site coincided with higher nutrient levels and an absence of deficiency symptoms. A delay in the standing crop increase at the Potamogeton site correlated with low nutrient levels and various physiological deficiency symptoms.

Degradation of Oil by Land Disposal

1987 ◽  
Vol 19 (8) ◽  
pp. 99-105 ◽  
Author(s):  
G. Tesan ◽  
D. Barbosa
Keyword(s):  
Nutrient Availability ◽  
Filter Cake ◽  
Test Procedure ◽  
Pilot Scale ◽  
Effluent Treatment ◽  
Biological Degradation ◽  
Chemical Fertilizers ◽  
Land Disposal ◽  
Micro Organisms

The work presented consists of a test procedure applied at a pilot scale using soil as a biological degradation agent. The experiments described were carried out with oily residues considered as wastes difficult to degrade by other means. The tests were applied to filter cake with activated clay containing 40% oil and oily residues from re-refining of lubricants to give white oils and vaseline. The effect of the amount of moisture is evaluated using a mechanical stirrer to improve the interaction between the wastes and microorganisms. The following are also evaluated: nutrient availability; incorporation of micro-organisms into the soil; introduction of chemical fertilizers; and, injections of sludge from effluent treatment plants.

scholarly journals What is the digestibility and caloric value of different botanical parts in corn residue to cattle?1

2019 ◽  
Vol 97 (7) ◽  
pp. 3056-3070 ◽  
Author(s):  
Emily A Petzel ◽  
Evan C Titgemeyer ◽  
Alexander J Smart ◽  
Kristin E Hales ◽  
Andrew P Foote ◽  
...  
Keyword(s):  
Organic Matter ◽  
Nutrient Availability ◽  
Heat Production ◽  
Latin Square ◽  
Metabolizable Energy ◽  
Net Energy ◽  
Digestible Energy ◽  
Randomized Design ◽  
Corn Residue ◽  
Completely Randomized Design

AbstractTwo experiments were conducted to measure rates of ruminal disappearance, and energy and nutrient availability and N balance among cows fed corn husks, leaves, or stalks. Ruminal disappearance was estimated after incubation of polyester bags containing husks, leaves or stalks in 2 separate ruminally cannulated cows in a completely randomized design. Organic matter (OM) that initially disappeared was greatest for stalks and least for husks and leaves (P < 0.01), but amounts of NDF that initially disappeared was greatest for husks, intermediate for stalks, and least for leaves (P < 0.01). Amounts of DM and OM that slowly disappeared were greatest in husks, intermediate in leaves, and least in stalks (P < 0.01). However, amounts of NDF that slowly disappeared were greatest in leaves, intermediate in husks, and least in stalks (P < 0.01). Rate of DM and OM disappearance was greater for leaves, intermediate for husks and least for stalks, but rate of NDF disappearance was greatest for stalks, intermediate for leaves, and least for husks (P < 0.01). Energy and nutrient availability in husks, leaves, or stalks were measured by feeding ruminally cannulated cows husk-, leaf-, or stalk-based diets in a replicated Latin square. Digestible energy lost as methane was less (P = 0.02) when cows were fed leaves in comparison to husks or stalks, and metabolizable energy (Mcal/kg DM) was greater (P = 0.03) when cows were fed husks and leaves compared with stalks. Heat production (Mcal/d) was not different (P = 0.74) between husks, leaves, or stalks; however, amounts of heat produced as a proportion of digestible energy intake were less (P = 0.05) among cows fed leaves in comparison to stalks or husks. Subsequently, there was a tendency (P = 0.06) for net energy available for maintenance from leaves (1.42 Mcal/kg DM) to be greater than stalks (0.91 Mcal/kg DM), and husks (1.30 Mcal/kg DM) were intermediate. Nitrogen balance was greater when cows were fed leaves, intermediate for husks, and least for stalks (P = 0.01). Total tract digestion of NDF was greater (P < 0.01) for husks and leaves compared with stalks. Husks had greater (P = 0.04) OM digestibility in comparison to stalks, and leaves were intermediate. Apparently, greater production of methane from husks in comparison to leaves limited amounts of energy available for maintenance from husks even though total-tract nutrient digestion was greatest when cows were fed husks or leaves.

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