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Simulation of carbon di oxide uptake and water relations of 4 arctic bryophytes at point barrow alaska


Photosynthetica (Prague) 12(1): 7-20
Simulation of carbon di oxide uptake and water relations of 4 arctic bryophytes at point barrow alaska
A simulation model for CO2 uptake and water relations of 4 arctic mosses generalizes from experimental measurements on physiological processes to field conditions and closely predicts the daily courses of CO2 uptake and seasonal courses of tissue water content. Maximum simulated rates of CO2 uptake in the field are: 1.5-1.8 mg CO2 g-1 (dry wt) h-1 for Calliergon sarmentosum, 0.9-1.2 mg CO2 g-1 (dry wt) h-1 for Polytrichum alpinum, 0.8-1.0 mg CO2 g-1 (dry wt) h-1 for Dicranum angustum and 0.4-1.6 mg CO2 g-1 (dry wt) h-1 for D. elongatum. Total seasonal production of pure stands is 70.6, 39.9, 38.5 and 23.5 g CO2 m-2, respectively. At high soil water potentials Calliergon has the highest CO2 uptake rate of the 4 spp., but at low soil water potentials Calliergon has the lowest CO2 uptake rate and Polytrichum and D. angustum the highest. Simulations showed differential seasonal patterns of diurnal photosynthesis. Calliergon and D. angustum demonstrated their highest rates of photosynthesis early in the season. At this time Polytrichum and D. elongatum showed their lowest rates.


Accession: 006418434



Related references

Simulation of CO2 uptake and water relations of four arctic bryophytes at Point Barrow, Alaska. Photosynthetica 2 (1) 7-20, 1978

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