Spatial variation of grassland canopy affects soil wetting patterns and
preferential flow
- Gökben Demir,
- Beate Michalzik,
- Janett Filipzik,
- Johanna Metzger,
- Anke Hildebrandt
Gökben Demir
Friedrich Schiller University Jena Institute of Geoscience / Chair of Terrestrial Ecohydrology Jena 07749 Germany
Corresponding Author:[email protected]
Author ProfileBeate Michalzik
Friedrich Schiller University Jena Institute of Geography/Chair of Soil Science Jena 07743 Germany
Author ProfileJanett Filipzik
Friedrich Schiller University Jena Institute of Geoscience / Chair of Terrestrial Ecohydrology Jena 07749 Germany
Author ProfileJohanna Metzger
Friedrich Schiller University Jena Institute of Geoscience / Chair of Terrestrial Ecohydrology Jena 07749 Germany
Author ProfileAnke Hildebrandt
Friedrich Schiller University Jena Institute of Geoscience / Chair of Terrestrial Ecohydrology Jena 07749 Germany
Author ProfileAbstract
Canopies shape net precipitation patterns, which are spatially
heterogeneous and control soil moisture response to rainfall. The vast
majority of studies on canopy water fluxes were conducted in forests,
whereas grassland canopies are often assumed to be spatially
homogeneous, therefore likely not inducing patches of heterogeneity at
and below the soil surface. Yet, some studies on short-structured
vegetation, such as grasslands, proposed the importance of
canopy-induced heterogeneity for net precipitation, but systematic
investigations on the effects on soil wetting patterns are missing.
Therefore, in this study, we investigated soil moisture response to
rainfall in a managed temperate grassland by exploring the individual
impacts of spatially varying throughfall, vegetation height and
antecedent soil moisture status on the soil wetting patterns. We applied
linear mixed effects models to disentangle the role of grassland canopy
versus abiotic drivers. The spatial average soil water response showed
that less and less water was stored in the upper parts of the soil as
the growing season progressed and the soils dried, indicating bypass
flow. Spatial variation of grass height was a significant driver of soil
wetting patterns along with precipitation and antecedent soil moisture
status. Soil wetting was suppressed in locations with tall canopy,
although surprisingly this was not directly related to throughfall
patterns. Instead, our results suggest that seasonally drier conditions
and grassland stemflow kick off preferential flow. Ultimately, our
results confirm that spatial variation of the canopy affects soil
moisture wetting patterns not only in forests and indicate a strong
influence of preferential flow on soil water patterns.11 Apr 2022Submitted to Hydrological Processes 11 Apr 2022Submission Checks Completed
11 Apr 2022Assigned to Editor
11 Apr 2022Reviewer(s) Assigned
09 Jun 2022Review(s) Completed, Editorial Evaluation Pending
09 Jun 2022Editorial Decision: Revise Major
04 Sep 20221st Revision Received
04 Sep 2022Assigned to Editor
04 Sep 2022Submission Checks Completed
04 Sep 2022Reviewer(s) Assigned
19 Sep 2022Review(s) Completed, Editorial Evaluation Pending
20 Sep 2022Editorial Decision: Revise Minor
02 Nov 20222nd Revision Received
02 Nov 2022Submission Checks Completed
02 Nov 2022Assigned to Editor
02 Nov 2022Reviewer(s) Assigned
02 Nov 2022Review(s) Completed, Editorial Evaluation Pending
02 Nov 2022Editorial Decision: Accept