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| filereference:dbsystem:soils [2015/03/27 21:34] – enviadmin | filereference:dbsystem:soils [2022/04/04 19:21] (current) – [Soils Database Table] enviadmin |
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| ====== Soils Database Table ====== | ====== Soils Database Table ====== |
| [{{ :apps:dbmanager:dbmanager_soils.png ?nolink 800 |Soils Database Table}}] | {{ :apps:dbmanager:dbmanager_soils.png ?nolink 800 |Soils Database Table showing detailed soil data for "Loam"}} |
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| ===== Content ===== | ===== Content ===== |
| === Water Content (Natural soils only) === | === Water Content (Natural soils only) === |
| The [[wp>Water_content| volumetric water content ]] defines the amount of liquid water per cube meter soil. For the ENVI-met simulations, three different critical threshold points need to be defined for a given soil: | The [[wp>Water_content| volumetric water content ]] defines the amount of liquid water per cube meter soil. For the ENVI-met simulations, three different critical threshold points need to be defined for a given soil: |
| * **Water content at Saturation**: the (theoretical) maximum amount of water inside the soil when each air pore is filled with water. In practise, this amount can only be reached if the soil cannot drain water to lower soil layers and is completely watered. | |
| * **Water content at Field Capacity**: [[wp>Field_capacity| Field capacity]] this is the maximum amount of liquid water the soil can hold against gravity without loosing water through drainage. Not every pore of the soil matrix is filled with water | * **Water content at Saturation**: The (theoretical) maximum amount of water inside the soil when each pore in the soil matrix is filled with water. In practise, this amount can only be reached if the soil cannot drain water to lower soil layers and is completely watered. |
| * ** Water content at Wilting Point**: the [[wp>Permanent_wilting_point| (permanent) wilting point]] is the lowest threshold defined for a drying soil. This is the minimum water content required, so that plant roots can extract water out of the soil. If the soil water content is lower than the wilting point value, the soil still contains water, but it cannot be used by the plants for transpiration. | * **Water content at Field Capacity**: At [[wp>Field_capacity| Field capacity]] the soil holds the maximum amount of liquid water the soil matrix can hold against gravity without loosing water through drainage. Not every pore of the soil matrix is filled with water |
| | * ** Water content at Wilting Point**: The [[wp>Permanent_wilting_point| (permanent) wilting point]] is the lowest threshold defined for a drying soil. This is the minimum water content required, so that plant roots can extract water out of the soil. If the soil water content is lower than the wilting point value, the soil still contains water, but it cannot be used by the plants for transpiration. |
| These values are a constant property of the soil and its texture matrix and are normally available for a limited list of soils. | These values are a constant property of the soil and its texture matrix and are normally available for a limited list of soils. |
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| | === Matrix Potential === |
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