| Autor: |
Mills, T. M., Morgan, K. T., Parsons, L. R. |
| Zdroj: |
Journal of Crop Production; Jan2000, Vol. 2 Issue 2, p163-179, 17p |
| Abstrakt: |
We investigated the responses of citrus stomata to leaf age, leaf position, canopy size and local microclimate. Large differences existed in the stomatal response due to leaf age within a 15-year-old canopy. Much smaller differences due to leaf age were evident in 7-year-old and 2-year-old trees. Likewise, position in the canopy played a significant role in determining stomatal response within a 15-year-old tree, but had little influence in the smaller trees. Stomatal conductance data were in good agreement with values calculated using a previously published stomatal-response function based on incident photosynthetically active radiation and the vapor pressure deficit of air. The model of stomatal conductance was used to calculate total daily plant water use of 2-year-old trees based on the Penman-Monteith model. Calculated values of plant water use were close to actual values for these 2-year-old trees as measured using weighing lysimeters. These results confirm the robustness of the Penman-Monteith model for the evaluation of citrus water use. We then scaled our calculations up to the 15-year-old field grown trees. Our study highlights the differences in stomatal response between various populations of leaves within a citrus canopy and indicate the important role stomatal conductance has in determining water use of citrus trees. [ABSTRACT FROM PUBLISHER] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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