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001-es BibID:BIBFORM087671
Első szerző:Szabó Sándor (biológus)
Cím:Decomposition of duckweed (Lemna gibba) under axenic and microbial conditions: flux of nutrients between litter water and sediment, the impact of leaching and microbial degradation / Sándor Szabó, Mihály Braun, Péter Nagy, Sándor Balázsy, Otto Reisinger
Dátum:2000
ISSN:0018-8158 1573-5117
Megjegyzések:The decomposition of axenic Lemna gibba has been studied over a 200 day period under laboratory conditions in the presence and absence of wastewater micro-organisms. The residual mass of plant litter in the decomposition vessels decreased three times more rapidly under biotic than abiotic conditions. The organic matter in the duckweed litter lost about half its weight within 67.9 days in the presence of micro-organisms while more than 200 days were required in axenic vessels. In the former case, AFDW loss followed an exponential pattern of decay. The rate constant was 0.0102 day(-1) and the decay was virtually complete after 200 days. The C and K concentration of the remaining duckweed litter decreased; the N, Ca, Fe and B concentration increased in both treatments. The concentration of total N, P, K, Mg, and Mo increased in the receiving water in both treatments but was much higher under biotic than abiotic conditions. Mass balances of nutrients in the vessels and flux of these nutrients between compartments in the vessels (duckweed litter, water and sediment) have been determined. Under axenic conditions the release of elements was very slow. Only notably potassium leaching had occurred. Leaching of potassium, magnesium and organic carbon took place mainly during the first term of incubation and then slowed down. Under biotic decomposition the elemental content of the litter decreased by more than 50% over 43 days for K, 53 days for Mo, 64 days for C, 81 days for Mg, 101 days for S, 104 days for P, 108 days for Na, 111 days for N, 140 days for B. Calcium and iron immobilised in the litter. Most of the released N, S, P, K, Mg and Mo remained in the water, but B and Mn settled into the sediment. The result of the investigation demonstrated that the nutrient flux from decomposing duckweed litter is mainly a microbially mediated process.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
folyóiratcikk
decomposition
Lemna gibba
wastewater
micro-organisms
leaching
Megjelenés:Hydrobiologia. - 434 : 1/3 (2000), p. 201-210. -
További szerzők:Braun Mihály (1966-) (vegyész, analitikus) Nagy Péter Tamás (1970-) (vegyész) Balázsy Sándor Reisinger, Otto
Pályázati támogatás:F6022
OTKA
Internet cím:Szerző által megadott URL
DOI
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001-es BibID:BIBFORM016488
Első szerző:Szabó Sándor (biológus)
Cím:Strong growth limitation of a floating plant (Lemna gibba) by the submerged macrophyte (Elodea nuttallii) under laboratory conditions / Sándor Szabo, Marten Scheffer, Rudi Roijackers, Beata Waluto, Mihaly Braun, Peter T. Nagy, Gabor Borics, Luis Zambrano
Dátum:2010
ISSN:0046-5070
Megjegyzések:The asymmetric competition for light and nutrients between floating and submerged aquatic plants is thought to be key in explaining why dominance by either of these groups can be stable and difficult to change. Although the shading effect of floating plants on submerged plants has been well documented, the impact of submerged plants on floating plants has been poorly explored hitherto. Here, we used laboratory experiments to examine how submerged plant (Elodea nuttallii) alter nutrient conditions in the water column and how this affects the growth of floating plants (Lemna gibba). We demonstrate that, at higher nutrient concentrations, Lemna is increasingly likely to outcompete Elodea. Under low nutrient concentrations (0.1-2 mg N L-1) Elodea can strongly reduce the growth of Lemna. Growth of floating plants virtually stopped in some of the experiments with Elodea. Extremely reduced tissue N, Mn, chlorophyll and elongated roots indicated that the growth inhibition of Lemna by Elodea was predominantly caused by the latter's impact on the nutrient conditions for floating plants. These results strengthen the hypothesis that submerged plants can prevent colonization of a lake by floating plants.
Tárgyszavak:Természettudományok Kémiai tudományok idegen nyelvű folyóiratközlemény külföldi lapban
competition
duckweed
nutrient limitation
submerged plants
shallow urban lakes
aquatic macrophytes
azolla-filiculoides
phosphorus sources
catastrophic loss
waste-water
duckweed
competition
vegetation
algae
Megjelenés:Freshwater Biology. - 55 : 3 (2010), p. 681-690. -
További szerzők:Scheffer, Marten Roijackers, Rudi Waluto, Beata Braun Mihály (1966-) (vegyész, analitikus) Nagy Péter Tamás (1970-) (vegyész) Borics Gábor (biológus) Zambrano, Luis
Internet cím:DOI
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