Long-term effects of CO2 enrichment and temperature increase on a temperate grass sward

1996 ◽  
Vol 182 (1) ◽  
pp. 83-99 ◽  
Author(s):  
E. Casella ◽  
J. F. Soussana ◽  
P. Loiseau
Keyword(s):  
Temperature Increase ◽  
Co2 Enrichment ◽  
Long Term Effects ◽  
Grass Sward

Long-term effects of CO2 enrichment and temperature increase on a temperate grass sward

1996 ◽  
Vol 182 (1) ◽  
pp. 101-114 ◽  
Author(s):  
J. F. Soussana ◽  
E. Casella ◽  
P. Loiseau
Keyword(s):  
Temperature Increase ◽  
Co2 Enrichment ◽  
Long Term Effects ◽  
Grass Sward

Long-term Effects of Free Air CO2 Enrichment (FACE) on Soil Respiration

2006 ◽  
Vol 77 (1) ◽  
pp. 91-116 ◽  
Author(s):  
E. S. Bernhardt ◽  
J. J. Barber ◽  
J. S. Pippen ◽  
L. Taneva ◽  
J. A. Andrews ◽  
...  
Keyword(s):  
Soil Respiration ◽  
Co2 Enrichment ◽  
Long Term Effects ◽  
Free Air Co2 Enrichment ◽  
Free Air

scholarly journals Growth of Transplants and in Vitro-cultured Clones of Asparagus in Response to CO2 Enrichment and Supplemental Lighting

1990 ◽  
Vol 115 (3) ◽  
pp. 364-368 ◽  
Author(s):  
Yves Desjardins ◽  
André Gosselin ◽  
Michel Lamarre
Keyword(s):  
Co2 Enrichment ◽  
Dry Weight ◽  
Plant Size ◽  
Asparagus Officinalis ◽  
Photon Flux ◽  
Long Term Effects ◽  
Shoot Dry Weight ◽  
Supplemental Lighting

Asparagus (Asparagus officinalis L.) transplants and in vitro-cultured clones were grown and acclimatized under two photosynthetic photon flux (PPF) conditions (ambient and ambient + 80 μmol·s-1·m-2) and three atmospheric CO2 concentrations (330, 900, and 1500 ppm). Short- and long-term effects were measured in the greenhouse and after two seasons of growth in the field, respectively. In the greenhouse, CO2 enrichment (CE) and supplemental lighting (SL) increased root and fern dry weight by 196% and 336%, respectively, for transplants and by 335% and 229%, respectively, for clones. For these characteristics, a significant interaction was observed between SL and CE with tissue-cultured plantlets. In the absence of SL, CE did not significantly increase root or shoot dry weight. No interaction was observed between CE and SL for transplants, although these factors significantly improved growth. It was possible to reduce the nursery period by as much as 3 weeks with CE and SL and still obtain a plant size comparable to that of the control at the end of the experiment. Long-term effects of SL were observed after two seasons of growth in the field. Supplemental lighting improved survival of transplants and was particularly beneficial to in vitro plants. Clones grown under SL were of similar size as transplants after 2 years in the field.

scholarly journals Population dynamics of Cymodocea nodosa under future ocean scenarios.

2018 ◽  
Author(s):  
Amrit K Mishra
Keyword(s):  
Population Dynamics ◽  
Elevated Co2 ◽  
Marine Ecosystem ◽  
Co2 Enrichment ◽  
Cymodocea Nodosa ◽  
Long Term Effects ◽  
Leaf Production ◽  
Co2 Concentrations ◽  
Carbon Dioxide Co2

Rising carbon dioxide (CO2) concentrations in the atmosphere will increase the average pCO2 level in the world oceans, which will have a knock-on effect on the marine ecosystem. Coastal seagrass communities are predicted to benefit from the increase in CO2 levels, but long-term effects of elevated CO2 on seagrass communities are less understood. Population reconstruction techniques were used to investigate the population dynamics of Cymodocea nodosa meadows, exposed to long term elevated CO2 at volcanic seeps off Greece and Italy. Effect of elevated CO2 was noticed on the growth, morphometry, density, biomass and age structure at CO2 seeps than reference sites. Above to below ground biomass ratio of C. nodosa were higher at CO2 seeps. The shoot age and shoot longevity of plants were lower at seeps. The present recruitment (sampled year) of the seagrass were higher than long-term average recruitment of the communities near the seeps. Carbon to nitrogen ratios (%DW) and annual leaf production of C. nodosa were higher in leaves at seeps. This study suggests under long-term CO2 enrichment C. nodosa production increases, but the plant survival rate decreases because of other co-factors such as nutrient availability and trace metal toxicity. Therefore, along with high CO2 other factors must be taken into consideration while predicting effects of future CO2 concentrations.

Physiologic aspects of microwave irradiation of mammals

1961 ◽  
Vol 201 (2) ◽  
pp. 351-356 ◽  
Author(s):  
Sol M. Michaelson ◽  
Roderick A. E. Thomson ◽  
Joe W. Howland
Keyword(s):  
Microwave Irradiation ◽  
Ambient Temperature ◽  
Thermal Effect ◽  
Temperature Increase ◽  
Thermal Response ◽  
Critical Factor ◽  
Long Term Effects ◽  
Microwave Radar ◽  
Physiologic Responses

Dogs, rabbits, and rats exposed under controlled conditions to pulsed 2800 Mcycle/sec microwave (radar) radiation display characteristic physiologic responses, some of which are related to heating of superficial tissues. Specific changes in leukocyte levels occur which are independent of hematocrit or temperature increase. Postexposure lymphocytopenia and eosinopenia appear related to duration of exposure. Anesthetization of the dog results in an increased thermal susceptibility which is not evident in the rabbit or rat. Consumption of water during exposure depresses the thermal response. Exposure at increased ambient temperature results in a synergism of thermal effect reducing the tolerance to microwaves. Vasomotor integrity appears to be a critical factor in regulating the thermal response to microwaves. No specific long-term effects such as cataracts have been observed in animals held for more than 1 yr postexposure.

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