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What causes transpiration rates to decrease?
Because cooler air holds less water, its relative humidity increases or it is ‘moister air’. Therefore, warmer air will increase the driving force for transpiration and cooler air will decrease the driving force for transpiration.
Why would transpiration be lower in the afternoon?
Direct sunlight has the same effect as temperature as it warms the leaves up quicker. It also cause the stomata to open, thus more transpiration occurs during the day and the rate is higher on a sunny day compared to a cold dull day.
How does daylight affect transpiration?
During daytime in the sunlight, the rate of transpiration is faster. During dark, the stomata are closed, and hence transpiration hardly occurs at night. Wind: Transpiration is more when the wind is blowing faster as water evaporates faster from the leaves.
Why does transpiration rate decrease at night?
It is commonly assumed that transpiration does not occur at night because leaf stomata are closed in the dark. However, under conditions of high nighttime evaporative demand or low soil water availability, stomata were closed and E(n) or g(n) approached zero in eleven tree and seven shrub species.
What are the factors affecting on the transpiration rate?
The rate of transpiration is affected by several factors, including:
- temperature.
- humidity.
- wind speed.
- light intensity.
Why does wind increase the rate of transpiration?
It is easier for water to evaporate into dryer air than into more saturated air. Wind and air movement: Increased movement of the air around a plant will result in a higher transpiration rate. Wind will move the air around, with the result that the more saturated air close to the leaf is replaced by drier air.
Why does the rate of transpiration increase as the sun rises?
Light increases the rate of water absorption and the resulting increased turgidity of the two guard cells, which form the boundary of each stoma, brings about the opening of the stomates, increasing transpiration rate.
Is transpiration more common during the day than at night?
Second, evaporative demand and thus transpiration are expected to increase faster in the nighttime than in the daytime due to multiple impacts of climate change. An increase in temperature that drives higher vapor pressure deficit appears to proceed faster at night with global warming (1).
How sunken stomata reduce transpiration?
The sunken stomata creates a small pocket of moist air. The high humidity in the air pocket reduces the water potential gradient between the leaf air spaces and the exterior, and therefore decreases the rate of transpiration.