Figure
captions:
Figure 1: Rainfall and water table depth for deep (a) and shallow (b)
main sites. Sites with large and small catchments are represented by
maroon and black lines, respectively. A flat line indicates when the
water table was lost from the site.
Figure 2: Time series of tension at 5 cm depth (maroon lines) and
VWC0–3 cm (black solid lines), for S. fallax(white-filled circles) and S. palustre (grey-filled squares)
between DOY 176 (June 25th) and DOY 211 (July
30th) at the shallow sites (S). Large (L) catchment
area sites are shown on the left, while small (S) catchment area sites
are shown on the right. Water table depth (WTD - black dotted lines) is
shown relative to the moss surface. Date of water table loss is
indicated by a vertical dashed line.
Figure 3: Time series of tension at 5 cm depth (maroon lines) and
VWC0-3 cm (black lines) for S. fallax(white-filled circles) and S. palustre (grey-filled squares)
between DOY 176 (June 25th) and DOY 211 (July
30th) at the deep sites (D). Large (L) catchment area
sites are shown on the left, while small (S) catchment area sites are
shown on the right. Water table depth (WTD - black dotted lines) is
shown relative to the moss surface.
Figure 4: Relation between water table depth and volumetric water
content in the top 3 cm (a and b), and tension at 5 cm depth (c and d)
for deep (a and c) and shallow (b and d) sites. Shallow sites lost their
water table (denoted by ‘no WT’ ) with ‘no WT’ data shown
as boxplots for S. fallax (black) and S. palustre(maroon). A 1:1 relation between tension and WTD is shown as a black
solid line.
Figure 5: Box plot of tension measured at 5 cm depth during the
mid-summer drought intensive field survey (DOY 221) for deep and shallow
sites based on catchment size (a) and Sphagnum species (b).
Letters denote significant pairwise differences, where the significance
of one-way interactions Depth×Catchment and Depth×Species are shown in
(a) and (b), respectively.
Figure 6: Lab-measured chlorophyll fluorescence stress metric forSphagnum fallax (black) and Sphagnum palustre (maroon)
samples during a drying experiment. The stress metric is the variable
fluorescence over the maximum quantum yield
(Fv/Fm) of dark-adapted samples.
Empirical relations between Fv/Fm and
volumetric water content (VWC) are shown using a rectangular (dashed
lines) hyperbola. High and low VWC stress thresholds (dotted lines)
represent the 25% and 75% of the maximum modelled
Fv/Fm.
Figure 1