Feddes trapezium - Revision history

Frank@tygron.nl at 14:18, 15 July 2026

2026-07-15T14:18:43Z

← Older revision		Revision as of 14:18, 15 July 2026
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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 ~~the~~ 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 Feddes transpiration model.		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 ~~are~~ interpreted as a 0-1-1-0 transpiration factor trapezium.		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]]

Frank@tygron.nl at 14:17, 15 July 2026

2026-07-15T14:17:57Z

← Older revision		Revision as of 14:17, 15 July 2026
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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 ~~terrain~~ set attribute]]		\|api=*[[Api session event editor terraintype set attribute]]
	}}		}}

Frank@tygron.nl at 14:17, 15 July 2026

2026-07-15T14:17:50Z

← Older revision		Revision as of 14:17, 15 July 2026
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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 terrain set attribute]]
	}}		}}

Frank@tygron.nl at 14:17, 15 July 2026

2026-07-15T14:17:22Z

← Older revision		Revision as of 14:17, 15 July 2026
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	[[File:Feddes_trapezium.jpg\|x300px]]		[[File:Feddes_trapezium.jpg\|x300px]]

			{{article end
			\|seealso=*[[Root depth m (Water Overlay)]]
			*[[Root depth m (Terrain Attribute)]]
			}}

Frank@tygron.nl at 15:39, 27 February 2024

2024-02-27T15:39:18Z

← Older revision		Revision as of 15:39, 27 February 2024
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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 the oxygen stress, the ~~ROOT_DEPTH_M~~ can also be configured with four values instead of one, which will be interpreted using Feddes transpiration model.		To simulate the 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 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.

Frank@tygron.nl: Created page with "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 the oxygen stress, the ROOT_DEPTH_M can also be configured with four values instead of one, which will be interpreted using 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 de..."

2024-02-27T15:21:38Z

Created page with "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 the oxygen stress, the ROOT_DEPTH_M can also be configured with four values instead of one, which will be interpreted using 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 de..."

New page

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 the oxygen stress, the ROOT_DEPTH_M can also be configured with four values instead of one, which will be interpreted using 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 are interpreted as a 0-1-1-0 transpiration factor trapezium.

[[File:Feddes_trapezium.jpg|x300px]]