| Resumo: |
For the growth, development and hydrology of Eucalyptus plantation understanding, it’s necessary to know the factors that control the water flows. Aiming to improve hydrologic models of water balance on basins with planted forests, this work evaluates transpiration behavior and leaf water potential in two eucalyptus clones. Leaf water potential (Ψb) and climatic parameters had been related to foliar transpiration (E). In general, the changes with Ψb minor had shown to minor variation and throughout the day. One noticed behavior differentiated between the two clones in reply to the Ψb, total incident radiation (RIT) and vapour pressure deficit (DPVS). Clone A presented E average 76% greater in -0,5MPa when compared with clone B, indicating highest sensitivity of this clone to the RIT. On the other hand, clone B presented greater sensitivity to the DPVS. When in -1,0MPa, clone A showed a control to transpiration during the day, without much variation, while clone B transpirated more at the beginning of the morning, with oscillations throughout the day.
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