| Autor: |
Roessler, Paul G., Monson, Russell K. |
| Zdroj: |
Oecologia; October 1985, Vol. 67 Issue: 3 p380-387, 8p |
| Abstrakt: |
Yucca glauca in the Colorado shortgrass prairie undergoes a pronounced midday depression in net photosynthesis and stomatal conductance under summer field conditions. This phenomenon can be duplicated in the laboratory using potted plants by simulating a typical summer daily pattern of leaf temperature and leaf-to-air water vapor concentration difference (?w). The decrease in photosynthetic rate appears to be due primarily to high leaf temperatures, while the decrease in stomatal conductance can be attributed mainly to high ?w values. Stomatal conductance also decreases when leaf temperatures exceed a critical threshold value, even when ?w is artificially maintained at a constant level. The threshold temperature is commonly attained for leaves in situ, but only after substantial stomatal closure has already occurred as a result of high ?w values. |
| Databáze: |
Supplemental Index |
| Externí odkaz: |
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