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Titolo:
RESPONSE OF BIOMASS AND NITROGEN YIELD OF WHITE CLOVER TO RADIATION AND ATMOSPHERIC CO2 CONCENTRATION
Autore:
MANDERSCHEID R; BENDER J; SCHENK U; WEIGEL HJ;
Indirizzi:
FED AGR RES CTR,INST ECOTOXICOL,BUNDESALLEE 50 D-38116 BRAUNSCHWEIG GERMANY
Titolo Testata:
Environmental and experimental botany
fascicolo: 2, volume: 38, anno: 1997,
pagine: 131 - 143
SICI:
0098-8472(1997)38:2<131:ROBANY>2.0.ZU;2-Z
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATED SEASONAL-CHANGES; TRIFOLIUM-REPENS L; OPEN-TOP CHAMBERS; CARBON-DIOXIDE; ELEVATED CO2; PERENNIAL RYEGRASS; PLANT-RESPONSES; PASTURE TURVES; LOLIUM-PERENNE; USE EFFICIENCY;
Keywords:
TRIFOLIUM REPENS; CO2 ENRICHMENT; NITROGEN FIXATION; RADIATION USE EFFICIENCY; TEMPERATURE EFFECT;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
34
Recensione:
Indirizzi per estratti:
Citazione:
R. Manderscheid et al., "RESPONSE OF BIOMASS AND NITROGEN YIELD OF WHITE CLOVER TO RADIATION AND ATMOSPHERIC CO2 CONCENTRATION", Environmental and experimental botany, 38(2), 1997, pp. 131-143

Abstract

The objectives of the present study were to test (i) whether the effect of season-long CO2 enrichment on plant dry matter production of white clover (Trifolium repens cv. Karina) depends on the temperature or can solely be explained by changes in radiation use efficiency, and (ii) whether the atmospheric CO2 concentration affects the relationship between tissue %N and plant biomass. Plants were grown in pots with adequate nutrient and water supply and were exposed to ambient and aboveambient CO2 concentrations (approximately + 80 ppm, + 160 ppm, + 280 ppm) in open-top chambers for two seasons. Nitrogen fertilizer was given only before the experiment started to promote N-2 fixation. Plants were clipped to a height of 5 cm, when the canopy had reached a heightof about 20 cm and when the CO2 effect had not been diminished due toself-shading of the leaves. Photon exposure (400-700 nm) measured above the canopy was linearly related to the above ground biomass, the leaf area index and the nitrogen yield (r(2)>0.94). The slopes of the curves depended on the CO2 concentration. Since most of the radiation (>90%) was absorbed by the foliage, the slopes were used to calculate the CO2 effect on the radiation use efficiency of biomass production, which is shown to increase curvilinearly between 380 and 660 ppm CO2 from 2.7 g MJ(-1) to 3.9 g MJ(-1). CO2 enrichment increased above ground biomass by increasing the leaf number, the individual leaf weight and the leaf area; specific leaf weight was not affected. The relative CO2response varied between harvests; there was a slight but not significant positive relationship with mean daytime temperature. At the beginning of the season, plant nitrogen concentration in the above ground biomass was decreased by CO2 enrichment. However, at later growth stages, when the plants depended solely on N-2 fixation, nitrogen concentration was found to be increased when the nitrogen concentration value was adjusted for the decrease due to the higher biomass of the plants exposed to elevated CO2. (C) 1997 Elsevier Science B.V.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/10/20 alle ore 03:44:25