During the day water loss by transpiration exceeds water absorption by the roots and leaf water potential decline.
白天蒸腾作用散失的水分超过根系吸收的水分，因而叶子的水势就下降。
The relationship between transpiration and potential evaporation was linear for well-watered seedlings.
很好供水的苗木的蒸腾量与潜在蒸发量成线型相关。
Leaf water potential and transpiration velocity of plant is two important physiologic index that reflect water regime of plant.
植物叶水势和蒸腾速率是反映植物水分状况的两个重要生理指标。
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