Soil-water budgets  Considers all forms of soil moisture for a given region  Indicates how much moisture is available for plants.

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Presentation transcript:

Soil-water budgets  Considers all forms of soil moisture for a given region  Indicates how much moisture is available for plants

Components of soil-water budget  Precipitation input (PRECIP)  Actual evapotranspiration (ACTET)  Potential evapotranspiration (POTET)  Deficit (DEFIC)  Surplus (SURPL)  Soil-moisture storage (ΔSTRGE)

Evapotranspiration  Evaporation The change of liquid water into water vapor The change of liquid water into water vapor  Transpiration A cooling mechanism in plants A cooling mechanism in plants  Evapotranspiration is therefore the release of water vapor from plants in order to cool them  Evapotranspiration is highest on hot and sunny days

Potential Evapotranspiration  The amount of water that would be evapotranspired under specific temperature and moisture conditions  This measurement ignores whether water is available for transpiration or not  It is the DEMAND!

INPUTS OUTPUTS

Deficit  Will occur if the requirements for potential evapotranspiration are not met Surplus  Will occur if the requirements for potential evapotranspiration are met and there is extra moisture available

Soil moisture storage  Amount of moisture available to plants Change storage = amount of water taken from ST to help meet PE when P is lacking Change storage = amount of water taken from ST to help meet PE when P is lacking

Water balance technique  Precipitation (P) vs potential evapotranspiration (PE)  P = AE + S + ST  PE = AE + D  AE = amount of water actually used by plants so if water is in good supply AE = PE…. IF WATER IS LACKING THEN AE = P + ST

POTET

Determining water budgets  For each month the following can be plotted PRECIP PRECIP POTET POTET ACTET ACTET

Water Balance  Plants will not use more than PE  Once PE is used up plants will take it from ST

1952 Mississippi JFMAMJJLASOND PE P P-PE ST ∆ST AE D S IS IT A WET OR A DRY YEAR?