Feddes trapezium: Difference between revisions
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Plants can experience oxygen stress when the groundwater level is too high. The plant roots become saturated so that the plant can no longer transpire. | Plants can experience oxygen stress when the groundwater level is too high. The plant roots become saturated so that the plant can no longer transpire. | ||
To simulate | To simulate water stress (including both drought and oxygen stress), the [[Root depth m (Water Overlay)|root depth]] can also be configured with four values instead of one, which will be interpreted using the Feddes transpiration model. | ||
In the model, when the groundwater level rises, the transpiration increases. However, at a certain point, the groundwater is too high and the transpiration decreases. Water on the surface can then still evaporate, but the plant cannot transpire anymore. | In the model, when the groundwater level rises, the transpiration increases. However, at a certain point, the groundwater is too high and the transpiration decreases. Water on the surface can then still evaporate, but the plant cannot transpire anymore. | ||
The sequence for the four values should be defined in order of largest to smallest depth values and | The sequence for the four values should be defined in order of largest to smallest depth values and is interpreted as a 0-1-1-0 transpiration factor trapezium. | ||
[[File:Feddes_trapezium.jpg|x300px]] | [[File:Feddes_trapezium.jpg|x300px]] | ||
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|seealso=*[[Root depth m (Water Overlay)]] | |seealso=*[[Root depth m (Water Overlay)]] | ||
*[[Root depth m (Terrain Attribute)]] | *[[Root depth m (Terrain Attribute)]] | ||
|api=*[[Api session event editor terraintype set attribute]] | |||
}} | }} | ||
Latest revision as of 14:18, 15 July 2026
Plants can experience oxygen stress when the groundwater level is too high. The plant roots become saturated so that the plant can no longer transpire. To simulate water stress (including both drought and oxygen stress), the root depth can also be configured with four values instead of one, which will be interpreted using the Feddes transpiration model. In the model, when the groundwater level rises, the transpiration increases. However, at a certain point, the groundwater is too high and the transpiration decreases. Water on the surface can then still evaporate, but the plant cannot transpire anymore.
The sequence for the four values should be defined in order of largest to smallest depth values and is interpreted as a 0-1-1-0 transpiration factor trapezium.
