Plant Types
SWAT+ categorizes plants into seven different types: warm season annual legume, cold season annual legume, perennial legume, warm season annual, cold season annual, perennial and trees. The differences between the different plant types, as modeled by SWAT+, are as follows:
1. warm season annual legume:
-simulate nitrogen fixation
-root depth varies during growing season due to root growth
2. cold season annual legume:
-simulate nitrogen fixation
-root depth varies during growing season due to root growth
-fall-planted land covers will go dormant when daylength is less than
the threshold daylength
3.perennial legume:
-simulate nitrogen fixation
-root depth always equal to the maximum allowed for the plant species and soil
-plant goes dormant when daylength is less than the threshold daylength
4.warm season annual:
-root depth varies during growing season due to root growth
5.cold season annual:
-root depth varies during growing season due to root growth
-fall-planted land covers will go dormant when daylength is less than the threshold
daylength
6.perennial:
-root depth always equal to the maximum allowed for the plant species and soil
-plant goes dormant when daylength is less than the threshold daylength
7. trees:
-root depth always equal to the maximum allowed for the plant species and soil
-partitions new growth between leaves/needles and woody growth
-growth in a given year will vary depending on the age of the tree relative to the
number of years required for the tree to full development/maturity
-plant goes dormant when daylength is less than the threshold daylength
Table 5:1-3: SWAT+ input variables that pertain to plant type.
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