\log
The initial iteration of the documentation section of this file
was created by Rick Ingersoll from Bowman (1994) on 22 August
1994. The data and a few comments were provided by Bill Bowman
in the form of an email message on 8 July 1994. The file was
put under sccs control on that date as well.[RCI 22 August 1994]
Fertilization plot locations surveyed by Tim Bardsley and Mike
Hartman on 13 July and 7 September 1994 were added to the
comments section on 13 September 1994.[RCI 13 September 1994]
URL locations for related data were updated on 26 September
2000.[MAH 26 September 2000]
\doc
TITLE. Accumulation of nitrogen and phosphorus in aboveground
biomass following fertilization in two alpine tundra communities.
ABSTRACT. To determine whether there are differences in the
relative capacity of communities to accumulate nutrients N and
P standing crops were measured following fertilization in two
alpine tundra communities. Dry meadow had greater increases in
aboveground N standing crop and tissue N concentration in
response to N fertilization than the wet meadow. The wet meadow
had a greater P accumulation response to P fertilization than
the dry meadow.
INVESTIGATOR. William D. Bowman, EPOB, CB 334, University of Colorado,
Boulder, CO, 80309-0334, (303) 492-2557 or 492-8841,
bowman@spot.colorado.edu.
VARIABLES. percent nitrogen in aboveground plant biomass, percent
phosphorus in aboveground plant biomass.
KEYWORDS. fertilization response, nutrient cycling, nutrient allocation, nitrogen, phosphorus, Biogeochemistry, vegetation pools, disturbance.
LOCATION. Study area was a gentle south-facing slope south of Saddle
in City of Boulder Watershed. Samples and original data are stored
in Ramaley Hall (Room N395).
TIMING. begin 1991, end 1991, once.
CITATIONS. [1]Bowman, W.D. 1994. Accumulation and use of nitrogen and
phosphorus following fertilization in two alpine tundra communities.
Oikos 70: 216-270.
COMMENTS. Treatment plots were established in early June 1990 in dry
and wet meadow communities on Niwot Ridge. Nitrogen, phosphorus, and
N+P amendments were applied using 40% N (urea) and 40% P (phosphoric
acid) osmocote slow-release fertilizer pellets. Twenty 2x2 m plots in
each community were established, with 5 replicates for each treatment
in each community, and 0.5 to 1 m buffer zones between the plots.
Treatments were assigned to plots such that control plots were not
below fertilizer treatments, and the same treatment was not applied
to adjacent plots.
Data are N and P contents (percent in aboveground biomass) of composited
samples from 5 replicate plots of 3 treatments (N, P, N+P) and control.
These data were collected in 1991.
Community type codes are d (dry meadow) and w (wet meadow). Treatment
codes are c (control), p (phosphorus), n (nitrogen), and np (nitrogen+
phosphorus.
Tim Bardsley and Mike Hartman conducted a rudimentary survey of the wet
meadow plots on 13 July 1994 in order to reference the plots to
established objects/points on Niwot Ridge. A Silva Ranger compass was
used with E declination set at 12 degrees; the accuracy of the bearings
is +/- 3 degrees. All distances were measured across the ground surface
(not at a fixed horizontal level); such distances are accurate to +/- 2%.
The bearing from the northwest corner of the c1 wet meadow plot to the
centerline of the wind turbine was 202 degrees. Thus, the bearing from
the centerline of the wind turbine to the northwest corner of the c1 wet
meadow plot was 22 degrees. The distance form the northwest corner of
the c1 wet meadow plot to the southwest corner of the base of the wind
turbine was 278.2 meters. A crude map of the relationships among the
dry meadow plots was provided by Bill Bowman and that map is on file
with the LTER data manager. Plot n1 was oriented west and south of c1.
Plot np1 was approximately due south of c1. The following plots were
approximately due west of np1 (with the most proximal listed first):
np2, p1, c2, p2, c3, p3, c4, np4, and c5. The bearing from the northwest
corner of c1 to the northwest corner of c5 was 309 degrees. South of
this row, and oriented approximately from west to east were plots n2,
n3, np5, np4, n4, np3, n5, and p5. The plots n2, n5, and p5 were
slightly out of line with the other plots in the row; the bearings from
the northwest corner of c1 to the northwest corner of these plots were
292, 249, and 239 degrees, respectively. Note that a band of willows
(approximately L-shaped) separates plots n5 and p5 from c2, p1, and np2.
The distances (meters) reported below are between the northwest corner
of c1 and the northwest corner of the given plot:
n1,3.55
np1,3.27
np2,6.19
p1,8.51
c2,12.65
p2,15.59
c3,18.84
p3,22.75
c4,24.89
p4,27.09
c5,29.55
n2,32.39
n3,28.45
np5,26.20
np4,23.63
n4,19.95
np3,15.55
n5,15.00
p5,16.75
Tim Bardsley and Mike Hartman conducted a rudimentary survey of the
dry meadow plots on 7 September 1994. A less sophisticated compass
was used for this survey and, consequently, all bearings reported
below are for magnetic, not true, north; a declination of 11.5
degrees should be added to the former to convert to the latter.
The bearing from the northeast corner of the c1 dry meadow plot to
the centerline of the wind turbine was 345 degrees. Thus, the
bearing from the centerline of the wind turbine to the northeast
corner of the c1 dry meadow plot was 165 degrees. The distance from
the northeast corner of the c1 dry meadow plot to the southwest
corner of the base of the wind turbine was 231.0 meters. The bearings
(degrees) and distances (meters) reported below are from the
northeast corner of the c1 dry meadow plot to the northeast corner of
the given plot:
np1,259,3.37
p1,178,3.12
n1,209,6.90
np2,192,10.46
p2,212,10.83
c2,222,12.20
n2,239,13.58
n3,232,17.41
np3,246,19.26
c3,199,31.47
p3,211,31.62
c4,214,32.50
np4,221,33.41
p4,228,34.60
c5,232,36.48
n4,234,39.07
p5,206,35.55
n5,207,37.74
np5,205,39.20
Plant biomass response to the fertilization can be found in:
http://culter.colorado.edu:1030/exec/.extracttoolA?fertprod.wb
\type
statistical.
\header
COL1. label=community type, type=string, units=none, missing value
indicator=, minimum=, maximum=, precision=
COL2. label=treatment type, type=string, units=none, missing value
indicator=, minimum=, maximum=, precision=
COL3. label=nitrogen content in aboveground biomass, type=real,
units=percent, missing value indicator=, minimum=, maximum=, precision=
COL4. label=phosphorus content in aboveground biomass, type=real,
units=percent, missing value indicator=, minimum=, maximum=, precision=
{*********************************************************************
If the data section below contains no data then you will need to
obtain permission from the investigator listed in the documentation
section of this file. If you have obtained permission or if the data
are already contained in this file, include the following
acknowledgment (in addition to an acknowledgment of the investigator)
in any published use of these data: "Logistical support
and/or data were provided by the Niwot Ridge Long-Term Ecological
Research project (NSF DEB 0423662) and the Mountain Research Station
(BIR 9115097)." Please send 4 reprints or high-quality copies of any
such publications to Todd Ackerman, NWT LTER data manager,
INSTAAR, CB 450, University of Colorado, Boulder, CO, 80309-0450.
The data contained in these files have many sources. Generally,
data collected prior to 1993 would have been subjected to quality
control standards imposed by the investigator. Data after 1992
were likely to have been manually entered and/or processed in the
NWT LTER central data management laboratory. Detailed information
on the quality control protocols and programs associated with any
data routed through the NWT LTER data management laboratory will
be supplied upon request. The user of these data should be aware
that, while efforts have been taken to ensure that these data are
of the highest quality, there is no guarantee of perfection for
the data contained herein and the possibility of errors exists.
If you encounter questionable data, please contact the NWT LTER
data manager (todda@culter.colorado.edu; (303) 492-4771) so that
the data can be corrected or qualified. Thus, these data should
be considered dynamic in that past data may be modified and future
data will be appended.
******************************************************************}
\data
d,c,1.79,0.13
d,c,2.14,0.12
d,c,1.82,0.13
d,c,1.9,0.11
d,c,1.88,0.12
d,p,2.02,0.41
d,p,2.34,0.43
d,p,2.04,0.41
d,p,1.97,0.51
d,p,1.97,0.51
d,n,3.15,0.12
d,n,3.24,0.11
d,n,3.09,0.1
d,n,2.97,0.11
d,n,3.02,0.09
d,np,2.92,0.29
d,np,2.56,0.29
d,np,2.66,0.25
d,np,2.86,0.32
d,np,2.59,0.38
w,c,2.41,0.14
w,c,2.11,0.11
w,c,2.08,0.1
w,c,1.93,0.1
w,c,2.01,0.09
w,p,2.49,0.42
w,p,2.24,0.58
w,p,2.78,1.09
w,p,2.05,0.39
w,p,1.69,0.52
w,n,2.6,0.1
w,n,2.95,0.11
w,n,2.64,0.11
w,n,2.55,0.12
w,n,2.31,0.1
w,np,2.27,0.27
w,np,2.63,0.5
w,np,2.9,0.44
w,np,3.1,0.52
w,np,2.74,0.34