Value

Meaning

Table

Root distribution from parameter values. Separate fractions are given for each soil layer.

Linear

A linear decrease of root density from soil surface to the root depth.

Constant

A constant root density from soil surface to the root depth.

Exponential

An exponential decrease of the root density from soil surface to the root depth. The root depth is defined as the depth where a fraction given by the parameter RootFracExpTail remains of the total uptake capacity. The remaining fraction RootFracExpTail is distributed at layers above the root depth to make the total uptake capacity equal to unity.