10.5061/DRYAD.0J2Q8
Templer, Pamela H.
Boston University
Weathers, Kathleen C.
Cary Institute of Ecosystem Studies
Ewing, Holly A.
Bates College
Dawson, Todd E.
University of California, Berkeley
Mambelli, Stefania
Boston University
Lindsey, Amanda M.
Cary Institute of Ecosystem Studies
Webb, Jeramy
Boston University
Boukili, Vanessa K.
University of California, Berkeley
Firestone, Mary K.
University of California, Berkeley
Data from: Fog as a source of nitrogen for redwood trees: evidence from
fluxes and stable isotopes
Dryad
dataset
2016
plant uptake of nitrogen
ammonium
nitrogen budget
nitrate
natural abundance
Sequoia sempervirens
2016-07-28T00:00:00Z
2016-07-28T00:00:00Z
en
https://doi.org/10.1111/1365-2745.12462
15173 bytes
1
CC0 1.0 Universal (CC0 1.0) Public Domain Dedication
A defining feature of the redwood forest in coastal California is the
presence of fog in the summer months, a time when there is typically
little rainfall. Our goal was to determine the role of summer fog in
canopy transformation of nitrogen, nitrogen uptake by trees and
photosynthesis within a coastal redwood forest ecosystem. We measured
horizontal and vertical inputs of nitrogen, the isotopic composition of
nitrogen in a variety of atmospheric sources (summer fog, winter rain and
throughfall throughout the year), nitrogen pools (soil solution) and plant
tissue (roots and foliage), as well as rates of photosynthesis and
nitrogen uptake by trees. Throughfall nitrogen fluxes were greater at the
forest edge compared to the interior both within the canopy (sampled 10 m
above-ground) and onto the forest floor (sampled 1 m above-ground; P
< 0.05). Similarly, soil solution inline image and total inorganic
nitrogen were greater at the forest edge compared to the interior (P =
0.0014 and 0.009, respectively). Whereas natural abundance δ15NO3 values
were not significantly different between winter rain (measured as bulk
precipitation) and summer fog water (average δ15N = −1.2 ± 0.680/00),
δ15NH4 values were significantly greater in fog water (11.4 ± 2.70/00)
compared to rain (1.2 ± 0.90/00). We found no difference in δ15N in roots
from forest edge trees compared to interior trees. In contrast, nitrogen
concentrations and δ15N in foliage from forest edge trees were
significantly greater compared to interior trees (P < 0.0001),
suggesting that the leaves of forest edge trees may be obtaining a greater
proportion of their nitrogen from fog compared to those of the interior
trees. Natural abundance 13C of leaf sugars and rates of photosynthesis
were significantly higher at the forest edge compared to the interior
during the fog season (P < 0.05), but not different between
locations in the rain season (P > 0.05). Nitrification in the
forest floor, rather than the canopy, is the primary source of inline
image in these soils throughout the year. Synthesis. Summer fog provides
nitrogen directly and indirectly to redwood trees, especially those at the
forest edge, and affects the physiologic function of redwood trees.
15N_DIN_WaterSamplesFile contains data for d15NH4 and d15NO3 (units = per
mil) of water samples, including throughfall, fog, bulk collectors,
gravimetric lysimeters, and tension lysimeters, collected in California
redwood forest. This file includes data from Table 1 in associated
manuscript.Roots&LeavesFile contains data for %N, d15N, %C, d13C
and C:N of needles and roots collected from the redwood forest edge and
interior. Units for d15N and d13C are per mil. This file includes data
from Table 2 in associated manuscript.ResinBags&ColumnsFile
contains data for fluxes of NH4 and NO3 in resin bags and resin columns
collected in California redwood forest. Units are ug N/m2/d for
throughfall and ug N/g resin/day for resin bags (soil solution). This file
includes data from Figure 1 in associated
manuscript.Isotopes_Water&ResinFile contains data for d15N and
d18O (units = per mil) of water and resin samples collected in a
California redwood forest. This file includes data from Figure 2 in
associated manuscript.Photosyn&LeafSugarFile contains data for C
assimilation (nmol C/g/sec) and d13C of leaf sugar (units = per mil)
collected in a California redwood forest. This file includes data from
Figure 3 in associated manuscript.RootUptakeFile contains data for
nitrogen uptake by roots of trees in a California redwood forest (units =
ug N/mg root/hr). This file includes data from Figure 4 in associated
manuscript.