benthic algae and nutrient cycling in lentic freshwater ecosystems

... concentrations; N and Ca in the buds, Ca and Zn in the branches, K in the fruits, and above all Fe and Cu in the other plant remains are noteworthy A general sequence in the concentration of nutrients ... Regina I., Nutrient cycling in deciduous forest ecosystems of the Sierra de Gata mountains: nutrient suplies to the soil through both litter and Ann Sci For 55 (1998) 771-784 throughfall, province ... Na recorded in all the organs during the third year of sampling and the irregularity observed for K are striking (Na is of mainly maritime origin, and hence its contribution via rainfall may be...

Ngày tải lên: 08/08/2014, 14:21

... small increase in concentration (about19 %, [33]) and to a large extent the enrichment in nutrients is due to the washing of dry depositions (mainly Ca, P, Fe, Cu and Zn, and Mg on some plots) and ... Precipitation input of inorganic chemicals in the open field and in forest stands Results of investigations in the State of Hesse, in: Georgii H.W (Ed.), Atmospheric Pollutants in Forest Areas, ... decomposition and quantitative inputs to the soil affect pedogenesis and the productivity of ecosystems Knowledge of these different aspects is a determining factor for understanding the functions of nutrient...

Ngày tải lên: 08/08/2014, 14:21

... cycling, nutrient soil turnover and stand nutrition of these stands in connection with this vigour There are few studies concerning biomass and nutrient cycling of Corsican pine stands growing ... hectares and is mainly composed of first generation pine stands established on former heathlands and sand dunes The forest is located at the edge of the High Campine plateau and ranges in elevation ... atmospheric inputs and leaching losses This ratio was especially high in the case of K, Mg and Ca in decreasing order of importance = = The requirements for N and P exceeded their uptake rates, indicating...

Ngày tải lên: 09/08/2014, 04:20

... Pakistan [15] Mean and standard deviation (SD) of energy, protein, selected minerals (Ca, Fe, Page of Zn) and vitamins (A and C) were determined from dietary intake data The vitamins and minerals selected ... cereals, legumes and other plant foods bind zinc and inhibit its absorption [41] Factors found mainly in plant foods including phosphorus, flavonoids, oxalates and soy protein can also inhibit iron ... protein intake Similarly, in the normal weight and underweight BMI categories, adequate energy and protein intake were reported for 64 and 22, and 47 and 17%, respectively Similarly, for minerals...

Ngày tải lên: 14/02/2014, 06:20

... C and nutrients in mature oak forests in NW Spain Assessment of the C and nutrient distribution in the plant-soil system is required for evaluation of future strategies aimed at preserving and ... d and total height: h) and stand measurements (basal area: BA, dominant height: H and mean height:H) as independent variables Two methods of achieving minimum variance in parameter estimates and ... nutrient concentration and that adjusted for gravel content Three soil pits were dug at random points in the sampling plots in each stand when tree biomass sampling was carried out To determine...

Ngày tải lên: 07/08/2014, 16:20

... Preprandial Postprandial Preprandial Postprandial 2.57 2.65 2.50 2.51 Preprandial Postprandial Preprandial Postprandial 267.0 285.8 197.9 206.5 Preprandial Postprandial Preprandial Postprandial ... Press, Washington DC, 1997 Kitchalong L, Fernandez JM, Bunting LD, Southern LL, Binder TD Influence of chromium tripicolinate on glucose metabolism and nutrient partitioning in growing lambs J ... offset, at least in part, the anabolic effect of insulin and contained further increase in their body weight The higher intake of Cr and other trace elements from the basal diet in the Cr supplemented...

Ngày tải lên: 07/08/2014, 18:21

... dynamics in decaying logging residues was monitored for one year in a thinned stand and in an adjacent clear-cut area In the latter, the effect of intensive site preparation involving logging residue ... logging residues were incorporated into the Figure Remaining slash needles (a) and twigs (b) after decomposition in the thinned stand and in the prepared and unprepared plots after clear-felling ... Litterfall in the thinned stand was collected monthly in each of six litter traps (0.25 m2) located at random in the plot, and analysed Six rain gauges were set at random in the plot and in the nearby...

Ngày tải lên: 08/08/2014, 14:21

... R.B., Nutrient concentrations in fine roots, Ecology 81 (2000) 275–280 [11] Grier C.C., Cole D.W., Dyrness C.T., Frederiksen R.I., Nutrient cycling in 37 and 450-year-old Douglas-fir ecosystems, in: ... was performed in 1992 [19] In 1999, stand increment between 1992 and 1999 was estimated from circumference at breast height (C130) inventory, and from application of biomass and nutrient tables ... underground into the soil by plants at thinning and/ or clearcutting [7]; – quantifying the current turnover of C and nutrients due to root decomposition [1, 8, 16]; – characterising tree anchorage...

Ngày tải lên: 08/08/2014, 14:21

... deposition and by rain, and their recycling within the biogeochemical cycle There is now much available data on biomass and nutrient contents in various forest stands; however, they mainly focus ... aboveground stand biomass, their yearly increments and nutrient contents were studied in coppices of Spain, Italy and France Litterfall and nutrient removal from trees to the soil were also assessed and ... given in table IV The total nutrient accumulation in biois given in table V For the five nutrients analyzed, the total aboveground bio-1 masses were 576.3 kg in San Martin and 711.0 and 601.9 kg in...

Ngày tải lên: 08/08/2014, 18:21

... fall and nutrient cycles in Kermes oak shrublands in Spain and 2) to provide new data from stands with different ecological conditions and fire histories MATERIALS AND METHODS 2.1 Study area and ... those used by Rapp and Lossaint [18] and Merino and Martin [ 14] Fifteen 0.25-m collecting baskets in each plot were randomly positioned 25 cm above the soil in the Kermes oak shrublands They had ... Productivity and management of Kermes oak brushlands for goats, in: Le Houerou H.N (Ed.), Int Symp Browse in Africa, ILCA, Addis Abeba, [21] Rodin L.E., Bazilevich N.J., Production and Mineral Cycling in...

Ngày tải lên: 08/08/2014, 23:22

... when interpreting the kinetics of 3-O MG (to represent glucose) absorption in the ICU setting ICU patients indeed show pharmacokinetic differences compared with normal individuals, including increased ... absorption of nutrients due to the persistence of migrating motor complexes during feeding [2,8] Conducting studies assessing intestinal absorption in ICU patients is a difficult task In particular, ... purposes) enabling reliable assessment of nutrient absorption in the ICU setting would be eminently desirable Competing interests The author declares that he has no competing interests References...

Ngày tải lên: 13/08/2014, 19:20

... chemical and physical alterations such as increased contaminant and nutrient runoff, an increase in suspended solids due to erosion, and changes in discharge and channel morphology (Skinner et ... presence, intensity and type of farming activity in the surrounding watershed We evaluated this hy- pothesis by examining the colonisation of ceramic sub- strates incubated in 29 streams and rivers in ... quality Introduction Intense farming has led to severe disturbance of watersheds throughout the world, resulting in fundamental changes in the structure and functioning of stream ecosystems Modern intensive...

Ngày tải lên: 28/07/2014, 17:21

... K and Hirata, A (2006) Simultaneous nitrogen and phosphorus removal using denitrifying phosphate-accumulating organisms in a sequencing batch reactor, Biochem Eng J., 27(3), 191-196 Yasui, H and ... source to inhibit oxic phosphorus uptake In the present study, to achieve efficient nutrient removal, the previous system was improved by introducing a microbubble ozonation system and by changing ... using DNPAOs In the present study, phosphorus was - 140 - Journal of Water and Environment Technology, Vol 7, No 2, 2009 removed both in the oxic and anoxic tanks, suggesting that both PAOs and...

Ngày tải lên: 05/09/2013, 09:38

... phosphatidylinositol 3-kinaseinteracting protein [11], plays a role in promoting autophagy [12] Beclin contains a Bcl-2-binding domain which may serve as a point of cross-talk between the autophagic and apoptotic ... to determine the effect of Beclin and its mutant lacking the Bcl-2-binding domain (Beclin 1DBcl2BD) [14] on autophagic activity under high- and low -nutrient conditions Both Flag–Beclin and its ... overexpressing Bcl-2 and Bcl-XL exhibited increased levels of Atg5–Atg12 conjugates and more GFP–LC3 punctae in response to etoposide [10], and Beclin lacking or mutated in the Bcl-2-binding domain caused...

Ngày tải lên: 07/03/2014, 09:20

... alfalfa in terms of lysine and arginine, two amino acids important in animal feeds Duckweeds are rich in leucine, threonine, valine, isoleucine and phenylalanine and are low in methionine and tyrosine.1 ... salinity and temperature Macronutrients (nitrate, phosphate and silicate) and micronutrients (various trace metals and the vitamins thiamine (B1), cyanocobalamin (B12) and biotin) are required for algal ... Pullin (1991) modified from Cagauan and Pullin (1991) Alalade and Iyayi (2006) modified from Cagauan and Pullin (1991) modified from Cagauan and Pullin (1991) modified from Cagauan and Pullin...

Ngày tải lên: 14/03/2014, 11:21

Ngày tải lên: 24/03/2014, 11:20

... grazing intensity in grassland carbon cycling (e.g., Risch and Frank 2006) However, we did find interactive effects of grazing intensity × pastures and years on ecosystem carbon fluxes Chimner and ... snow and summer rain influence ecosystem carbon cycling in a mixed-grass prairie, Wyoming, USA Ecohydrology Derner, JD, and RD Hart 2007 Grazing induced modifications to peak standing crop in northern ... rates in the U.S Great Plains Ecology 83:320–327 Fay, PA, JD Carlisle, AK Knapp, JM Blair, and SL Collins 2000 Altering rainfall timing and quantity in a mesic grassland ecosystem: Design and performance...

Ngày tải lên: 20/06/2014, 23:20

... Damage derplantings increases with a decreasing content of these nutrients in needles An opposite correlation was determined for aluminium: with an increasing proportion of this element in nutrition ... developed and humus organomineral horizon This environment can be simulated during outplanting by mixing humification and organomineral horizons at a 3:1 volume ratio in a planting pit 40 × 40 cm in ... between nutrient contents in soil and degree of damage to underplantings were tested at the sites concerned (Tables and 8) Damage to the studied underplantings increases with a decreasing proportion...

Ngày tải lên: 07/08/2014, 10:21

... at the beginning of incubation, and every days over the 20th day, mL of gas were sampled in the flask headspace with a syringe and injected immediately into the CO2 analyser (BINOS 1004 Infrared ... mineralization behaviour and fate of nutriments during incubation time Figures and illustrated the results obtained respectively before and after soil incubation In Figure 3, the horizontal F1 and vertical ... explained 60% and 19% of total variance The F1 axis was determined on one hand, by the nitrate and waterextractable Ca, Mg, and Mn contents, and on the other hand, by the water-extractable Fe and...

Ngày tải lên: 07/08/2014, 16:20

... thinning intensities for radiata pine and maritime pine Pinus radiata Intensity of thinning First thinning Pinus pinaster Second thinning First thinning Second thinning % of trees removed SG-ratio ... 12 and the strongest thinning) and in thinnings (close to 25% higher matching the best site quality and the strongest thinning) The ratio between removals and returns decreased as thinning intensity ... Figure Nutrient removals and nutrient returns to soil as logging residues due to thinnings and clear-cutting as a function of thinning intensity and site quality for radiata pine stands, in the...

Ngày tải lên: 07/08/2014, 16:21