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| Content Provider | Springer Nature Link |
|---|---|
| Author | Saito, Hideyuki Kakubari, Yoshitaka |
| Copyright Year | 1999 |
| Abstract | The light response curve and the intercellular CO2 concentration response curve of CO2 assimilation rate were investigated together with the light conditions at the four different heights within the beech crown from 1995 to 1997 on Mt. Fuji in Japan. On the seasonal fluctuation, the CO2 assimilation rate at light saturated condition increased rapidly in May, and attained to the maximum between the end of June and July, thereafter, slightly decreased until the middle of August and rapidly decreased in September and October. The daily sum of photosynthetic photon flux density attenuated with deeping within the crown, and particularly, the relative value on 2nd position dropped to only 30%. TheA max decreased from 10 to 5μmol m−2 s−1, approximately, with deeping within the crown. The light saturation point, quantum yield, light compensation point and dark respiration rate also varied with deeping. These results suggest that the photosynthetic properties vary gradually from sun to shade leaves along the light attenuation within a beech crown. At light saturated condition, the stomatal conductance and mesophyll conductance were strongly correlated withA max among the four different heights (r > 0.96, respectively). TheC i/C a ratio was around 0.8, and there were no remarkable differences among the four different heights. These results suggest that the vertical gradient ofA max depends on the variation of mesophyll conductance. The stomatal conductance may be also one of the major factor in the vertical gradient ofA max. However the intercellular CO2 concentration doesn’t influence the vertical gradient ofA max within the crown. |
| Starting Page | 27 |
| Ending Page | 34 |
| Page Count | 8 |
| File Format | |
| ISSN | 13416979 |
| Journal | Journal of Forest Research |
| Volume Number | 4 |
| Issue Number | 1 |
| e-ISSN | 16107403 |
| Language | English |
| Publisher | Springer-Verlag |
| Publisher Date | 1999-01-01 |
| Publisher Place | Tokyo |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | CO2 assimilation light conditions mesophyll conductance Siebold’s beech (Fagus crenata Bl.) crown stomatal conductance Forestry Forestry Management Tree Biology Plant Sciences Plant Ecology |
| Content Type | Text |
| Resource Type | Article |
| Subject | Forestry |
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