 |
| Titel |
Parameterization of a coupled CO2 and H2O gas exchange model at the leaf scale of Populus euphratica |
| VerfasserIn |
G. F. Zhu, X. Li, Y. H. Su, C. L. Huang |
| Medientyp |
Artikel
|
| Sprache |
Englisch
|
| ISSN |
1027-5606
|
| Digitales Dokument |
URL |
| Erschienen |
In: Hydrology and Earth System Sciences ; 14, no. 3 ; Nr. 14, no. 3 (2010-03-05), S.419-431 |
| Datensatznummer |
250012218
|
| Publikation (Nr.) |
 copernicus.org/hess-14-419-2010.pdf |
|
|
|
|
|
| Zusammenfassung |
| The following two models were combined to simultaneously predict CO2
and H2O gas exchange at the leaf scale of Populus euphratica: a Farquhar et al. type
biochemical sub-model of photosynthesis (Farquhar et al., 1980) and a
Ball et al. type stomatal conductance sub-model (Ball et al., 1987). The
photosynthesis parameters [including maximum carboxylation rate allowed by
ribulose-1,5-bisphosphate carboxylase/oxygenase (Rubisco)
carboxylation rate (Vcmax), potential light-saturated electron transport
rate (Jmax), triose phosphate utilization (TPU) and day respiration
(Rd)] were determined by using the genetic algorithm (GA) method based
on A/Ci data. Values of Vcmax and Jmax standardized at 25 °C
were 75.09±1.36 (mean ± standard error), 117.27±2.47,
respectively. The stomatal conductance sub-model was calibrated
independently. Prediction of net photosynthesis by the coupled model agreed
well with the validation data, but the model tended to underestimate
transpiration rates. Overall, the combined model generally captured the
diurnal patterns of CO2 and H2O exchange resulting from variation
in temperature and irradiation. |
| |
|
| Teil von |
|
|
|
|
|
|
|
|