Forest floor water content dynamics in a Douglas fir stand

Marcel Schaap, W. Beuten, J. M. Verstraten

Research output: Contribution to journalArticle

58 Citations (Scopus)

Abstract

This paper considers the hydrology of the forest floor within a homogeneous Douglas fir forest. Time domain reflectometry measurements show that forest floor water contents have considerable spatial variabilities but similar temporal dynamics. Simple linear relations can be used to translate forest floor water content dynamics from one site in a forest to another. Forest floor evaporation rates were calculated using a previously developed forest floor evaporation model and a year of soil water and micrometeorological data. For a relatively wet site within the stand the calculated evaporation rate was 137 mm year-1, for a more representative site 112 mm year-1 and for a dry site 76 mm year-1. These amounts range between 7 and 13% of the total yearly forest evapotranspiration. Together with throughfall rates and transpiration rates, these forest floor evaporation rates served as boundary conditions to a soil water model with which we simulated forest floor and mineral soil water content dynamics. The simulations showed that throughfall and drainage dynamics determine the forest floor water content dynamics in wet conditions. In dry periods, forest floor evaporation and, to a lesser extent, root water uptake determine forest floor water content dynamics. The same simulations showed that 25% of the forest floor evaporation is replenished by capillary rise from the mineral soil.

Original languageEnglish (US)
Pages (from-to)367-383
Number of pages17
JournalJournal of Hydrology
Volume201
Issue number1-4
DOIs
StatePublished - Dec 20 1997
Externally publishedYes

Fingerprint

forest floor
Pseudotsuga menziesii
forest litter
water content
evaporation
evaporation rate
throughfall
soil water
mineral soils
capillarity
time domain reflectometry
wet environmental conditions
water uptake
mineral
hydrology
transpiration
simulation
evapotranspiration
soil water content
drainage

Keywords

  • Evaporation
  • Forest floor
  • Forests
  • Hydrology
  • Models

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Cite this

Forest floor water content dynamics in a Douglas fir stand. / Schaap, Marcel; Beuten, W.; Verstraten, J. M.

In: Journal of Hydrology, Vol. 201, No. 1-4, 20.12.1997, p. 367-383.

Research output: Contribution to journalArticle

Schaap, Marcel ; Beuten, W. ; Verstraten, J. M. / Forest floor water content dynamics in a Douglas fir stand. In: Journal of Hydrology. 1997 ; Vol. 201, No. 1-4. pp. 367-383.
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