scholarly journals Low moisture availability inhibits the enhancing effect of increased soil temperature on net photosynthesis of white birch (Betula papyrifera) seedlings grown under ambient and elevated carbon dioxide concentrations

2009 ◽  
Vol 29 (11) ◽  
pp. 1341-1348 ◽  
Author(s):  
T. F. Ambebe ◽  
Q.-L. Dang
Keyword(s):  
Carbon Dioxide ◽  
Soil Temperature ◽  
Net Photosynthesis ◽  
Elevated Carbon Dioxide ◽  
Betula Papyrifera ◽  
White Birch ◽  
Enhancing Effect ◽  
Moisture Availability ◽  
Carbon Dioxide Concentrations

scholarly journals Net Carbon Dioxide Exchange Rates of Raspberries at Varying Irradiances, Carbon Dioxide Concentrations, and Air and Soil Temperatures

HortScience ◽  
1995 ◽  
Vol 30 (4) ◽  
pp. 881E-881
Author(s):  
David C. Percival ◽  
John T.A. Proctor ◽  
M.J. Tsujita
Keyword(s):  
Carbon Dioxide ◽  
Soil Temperature ◽  
Dark Respiration ◽  
Net Photosynthesis ◽  
Rubus Idaeus ◽  
Carbon Dioxide Exchange ◽  
Whole Plant ◽  
Carbon Dioxide Concentrations ◽  
Soil Temperatures ◽  
Variation Explained

The influence of irradiance, CO2, and temperature on whole-plant net C exchange rate (NCER) of micropropagated raspberries (Rubus idaeus L. cv. `Heritage') was examined in 1994. Irradiances >1000 μmol–m–2–s–1 PAR were required for light saturation, and net photosynthesis (Pn) greatly increased under CO2 enrichment (up to 2000 μl–liter–1) and was optimum at 17C. Temperature effects were separated in another experiment using varying air and soil temperatures (15, 20, 25, 30, and 35C) under saturated light and ambient CO2 levels (350 μl–liter–1). Both air and soil temperature influenced net Pn, with maximum rates occurring at an air/soil temperature of 17/25C and each contributing 71.2% and 26.7%, respectively, to the total variation explained by a polynomial model (R2 = 0.96). Dark respiration and root respiration rates also increased significantly with elevated air and soil temperatures. Therefore, results from this study indicate that maximum net Pn occurred at an air/soil temperature of 17/25C and that irradiance, CO2 levels, and shoot and root temperatures are all important factors in examining NCER in raspberries.

Effects of Elevated Carbon Dioxide Concentrations on Broiler Chicken Performance from 28 to 49 Days

2011 ◽  
Vol 10 (8) ◽  
pp. 597-602
Author(s):  
J.L. Purswell ◽  
J.D. Davis ◽  
B.D. Luck ◽  
E.J. Kim ◽  
H.A. Olanrewaju ◽  
...  
Keyword(s):  
Carbon Dioxide ◽  
Broiler Chicken ◽  
Elevated Carbon Dioxide ◽  
Carbon Dioxide Concentrations

Low soil temperature reduces the positive effects of high nutrient supply on the growth and biomass of white birch seedlings in ambient and elevated carbon dioxide concentrations

Botany ◽  
2009 ◽  
Vol 87 (10) ◽  
pp. 905-912 ◽  
Author(s):  
Titus Fondo Ambebe ◽  
Qing-Lai Dang ◽  
Jacob Marfo
Keyword(s):  
Carbon Dioxide ◽  
Soil Temperature ◽  
Nutrient Supply ◽  
Interactive Effects ◽  
Mass Ratio ◽  
White Birch ◽  
Stem Biomass ◽  
Leaf Mass Ratio ◽  
High Nutrient ◽  
High Nutrient Supply

To investigate the interactive effects of soil temperature (Tsoil) and nutrient supply on the responses of growth and biomass of white birch ( Betula papyrifera Marsh.) to atmospheric carbon dioxide concentration ([CO2]), seedlings were grown under two [CO2] (360 and 720 µmol·mol–1), three Tsoil (5, 15, and 25 °C initially, increased to 7, 17, and 27 °C one month later), and three nutrient regimes (Low: N–P–K = 4:1.8:3.3 mg·L–1; Intermediate: N–P–K = 80:35:66 mg·L–1; and High: N–P–K = 160:70:132 mg·L–1) for 4 months. Low Tsoil reduced leaf and total biomass at high nutrient supply and root biomass at intermediate and high nutrient supply. There were significant three-factor interactive effects on root collar diameter (RCD), stem biomass, and leaf mass ratio. Low Tsoil reduced RCD at high nutrient supply and stem biomass at intermediate and high nutrient supply in elevated [CO2] while intermediate and high Tsoil enhanced them. Values of leaf mass ratio were lowest at low Tsoil and low nutrient supply in elevated [CO2]. The effect of Tsoil was generally insignificant at low nutrient supply, but the responses of growth and biomass remained significantly higher under high than low nutrient supply at all Tsoil.

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