Effects of humidity during diurnal courses on the CO2- and light-saturated rate of net CO2 uptake in the sclerophyllous leaves of Arbutus unedo

Oecologia ◽  
1985 ◽  
Vol 67 (2) ◽  
pp. 301-304 ◽  
Author(s):  
O. L. Lange ◽  
J. D. Tenhunen ◽  
W. Beyschlag
Keyword(s):  
Co2 Uptake ◽  
Arbutus Unedo ◽  
Diurnal Courses ◽  
Net Co2 Uptake

Historical aspects and net CO2 uptake for cultivated Crassulacean acid metabolism plants in Mexico

2002 ◽  
Vol 140 (2) ◽  
pp. 133-142 ◽  
Author(s):  
PARK S NOBEL ◽  
EULOGIO PIMIENTA-BARRIOS ◽  
JULIA ZANUDO HERNANDEZ ◽  
BLANCA C RAMIREZ-HERNANDEZ
Keyword(s):  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Co2 Uptake ◽  
Historical Aspects ◽  
Net Co2 Uptake

Degrees of crassulacean acid metabolism in tropical epiphytic and lithophytic ferns

1999 ◽  
Vol 26 (8) ◽  
pp. 749 ◽  
Author(s):  
Joseph A.M. Holtum ◽  
Klaus Winter
Keyword(s):  
Carbon Isotope ◽  
Crassulacean Acid Metabolism ◽  
Acid Metabolism ◽  
Dark Period ◽  
Titratable Acidity ◽  
Isotope Ratios ◽  
Light Period ◽  
Co2 Uptake ◽  
Carbon Isotope Ratios ◽  
Net Co2 Uptake

Crassulacean acid metabolism (CAM) was observed in three species of tropical ferns, the epiphytes Microsorium punctatum and Polypodium crassifolium and the lithophyte Platycerium veitchii. Polypodium crassifolium and P. veitchii exhibited characteristics of weak CAM. Although no net nocturnal CO2 uptake was observed, the presence of CAM was inferred from nocturnal increases in titratable acidity of 4.7 and 4.1 µequiv (g fr wt)–1 respectively, a reduction in the rates of net CO2 evolution during the first half of the dark period, and the presence of a CAM-like decrease in net CO2 uptake during the early light period. In M. punctatum net CO2 uptake during the first half of the dark period was accompanied by an increase in titratable acidity of 39.2 µequiv (g fr wt)–1 and a pronounced reduction in net CO2 uptake during the early light period. When water was withheld from P. crassifolium and M. punctatum, net CO2 uptake during the light was reduced markedly but there was no change in the extent or patterns of CO2 exhange in the dark. As a consequence, the proportion of carbon gained due to CO2 fixation in the dark increased from 2.8 and 10% to 63.5 and 49.3%, respectively (100% being net CO2 uptake during the light plus the estimated CO2 uptake during the dark). After 9 days without added water, dark CO2 uptake was responsible for the maintenance of a net 24 h carbon gain in P. crassifolium. Platycerium veitchii, P. crassifolium and M. punctatum exhibited carbon isotope ratios of between –25.9 and –22.6‰ indicating that carbon isotope ratios may not, by themselves, be sufficient for the identification of weak CAM. We suggest that CAM may be more prevalent in tropical epiphytic and lithophytic ferns than currently envisaged.

scholarly journals Cloud cover limits net CO2 uptake and growth of a rainforest tree during tropical rainy seasons

2003 ◽  
Vol 100 (2) ◽  
pp. 572-576 ◽  
Author(s):  
E. A. Graham ◽  
S. S. Mulkey ◽  
K. Kitajima ◽  
N. G. Phillips ◽  
S. J. Wright
Keyword(s):  
Cloud Cover ◽  
Co2 Uptake ◽  
Net Co2 Uptake

scholarly journals Spring photosynthetic onset and net CO2 uptake in Alaska triggered by landscape thawing

2018 ◽  
Vol 24 (8) ◽  
pp. 3416-3435 ◽  
Author(s):  
Nicholas C. Parazoo ◽  
Almut Arneth ◽  
Thomas A. M. Pugh ◽  
Ben Smith ◽  
Nicholas Steiner ◽  
...  
Keyword(s):  
Co2 Uptake ◽  
Net Co2 Uptake

Photosynthetic Responses of Three Codominant Species from the North-western Sonoran Desert - a C3 Deciduous Sub-shrub, a C4 Deciduous Bunchgrass, and a CAM Evergreen Leaf Succulent

1997 ◽  
Vol 24 (6) ◽  
pp. 787 ◽  
Author(s):  
Park S. Nobel ◽  
Hehui Zhang
Keyword(s):  
Leaf Area ◽  
Sonoran Desert ◽  
Summer Rainfall ◽  
Productivity Index ◽  
Annual Rainfall ◽  
Photon Flux ◽  
Co2 Uptake ◽  
The North ◽  
Net Co2 Uptake ◽  
North Western

To investigate seasonal and annual influences of environmental conditions on leaf net CO2 uptake (A), three codominant species from the north-western Sonoran Desert differing in photosynthetic pathway and leaf phenology were examined: the C3 deciduous sub-shrub Encelia farinosa, the C4 deciduous bunchgrass Pleuraphis rigida, and the CAM evergreen leaf succulent Agave deserti. To allow interspecific comparisons and to predict field responses from 1974 through 1995, an environmental productivity index (EPI) model previously developed for CAM plants was used, which scaled the responses of A to water, temperature, and photosynthetic photon flux (PPF) over 24-h periods to individual dimensionless values. The net CO2 uptake predicted using the EPI approach agreed well with field measurements. Agave deserti was the most drought-tolerant and E. farinosa was the least; the optimum day/night air temperatures and the PPF requirement for A were highest for P. rigida and lowest for A. deserti. For 1974 through 1995, daily EPI averaged over a year was highest for E. farinosa, indicating that it operates closest to its photosynthetic optimum. However, the predicted A was highest for P. rigida. Variations in A were annually bimodal, with the greatest differences among the three species in wet years. Afor all three species increased linearly as annual rainfall increased. Leaf area per plant for E. farinosa was highest in the winter and early spring and did not respond appreciably to summer rainfall; leaf area for P. rigida was also highest in the winter. For the evergreen A. deserti, which based on ground cover is the dominant species at the field site, new leaves unfolded in response to both winter and summer rainfall but most photosynthetic area was contributed by older leaves, leading to the highest annual plant net CO2 uptake.

Sign in / Sign up

Export Citation Format

Share Document