Abstract
The dark respiration of five tropical rain forest and five coastal desert plant species experienced in very high CO 2 concentrations(1500μmol/mol)in Biosphere 2 for more than 4.5 years,was studied using a portable LI 6400 Photosynthesis system.The result showed that the average dark respiration of the rain forest species was (0 56±0 19)μmol CO 2/m 2·s under near ambient CO 2 concentration (350～400μmol/mol),and that of the desert species was(0 98±0 72)μmol CO 2/m 2·s.The dark respiration of both the rain forest and the desert C 3 species showed increases of 61% and 134% respectively,when CO 2 concentration was doubled.But the C 4 desert species appeared little change or somehow decrease.This could be ascribed to the fact that more carbohydrate compounds that dark respiration required were produced because of the enhencement of photosynthesis,and more energy and material were needed as a result of the fast growth of the C 3 species under a high CO 2 environment.So the respiration such as the maintenance respiration may be increased in order to provide the energy and material needed.
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Claims 5
Claim · model-written summary
Rain forest species had average dark respiration of (0 56±0 19)μmol CO 2/m 2·s at near ambient carbon dioxide.
Verbatim
e0“average dark respiration of the rain forest species was (0 56±0 19)μmol CO 2/m 2·s under near ambient CO 2 concentration (350～400μmol/mol)”
Claim · model-written summary
Desert species had average dark respiration of (0 98±0 72)μmol CO 2/m 2·s at near ambient carbon dioxide.
Verbatim
e0“average dark respiration of the rain forest species was (0 56±0 19)μmol CO 2/m 2·s under near ambient CO 2 concentration (350～400μmol/mol),and that of the desert species was(0 98±0 72)μmol CO 2/m 2·s”
Claim · model-written summary
Doubling carbon dioxide increased dark respiration of rain forest C3 species by 61%.
- Taxon
- rain foreste0
- Treatment
- CO 2 concentration was doublede0
- Outcome
- dark respiratione0
- Direction
- increasese0
- Value
- 61%e0
Not reportedComparator
Verbatim
e0“dark respiration of both the rain forest and the desert C 3 species showed increases of 61% and 134% respectively,when CO 2 concentration was doubled”
Claim · model-written summary
Doubling carbon dioxide increased dark respiration of desert C3 species by 134%.
- Taxon
- desert C 3 speciese0
- Treatment
- CO 2 concentration was doublede0
- Outcome
- dark respiratione0
- Direction
- increasese0
- Value
- 134%e0
Not reportedComparator
Verbatim
e0“dark respiration of both the rain forest and the desert C 3 species showed increases of 61% and 134% respectively,when CO 2 concentration was doubled”
Claim · model-written summary
Desert C4 species showed little change or a decrease in dark respiration.
Not reportedTreatmentComparator
Verbatim
e0“But the C 4 desert species appeared little change or somehow decrease”
t0“dark respiration of some tropical rain forest and coastal desert plant species”