\log
The documentation section of this file was developed from the NWT LTER Data
Directory (Symphony files DDABSTRA.WR1, DDDOCUME.WR1, DDMASTER.WR1,
DDVARIAB.WR1; last updated 16 December 1991) by Susan Kindig and Rick
Ingersoll in early November 1992. Information contained in the header
section, was provided by Lesley Smith late November 1992.[RCI,
30 November 1992] Data were provided by Lesley Smith in early February
1993.[RCI, 17 February 1993] This file was put under sccs control on 30 March
1993. See the appropriate history file for additional log information.
[RCI 30 March 1993] Fertilization plot locations surveyed by Tim
Bardsley and Mike Hartman on 13 July and 7 September 1994 were
added to the comments section on 14 September 1994.[RCI 14 September
1994] URL locations for related data were updated on 27 September 2000.[MAH
27 September 2000]
\doc
TITLE. Methane emissions.
ABSTRACT. Methane emissions were measured from dry and wet meadow plots
established by W. Bowman in the Boulder watershed south of the Saddle. The
effects of N and P fertilization were evaluated.
INVESTIGATOR. Lesley Smith, EPOB, Campus Box 334, University of Colorado,
Boulder, CO, 80309-0334, (303) 492-5191, smithmorri_l@cubldr.colorado.edu.
VARIABLES. soil moisture, soil temperature, methane flux, total soil C,
total soil N.
KEYWORDS. methane, emissions, Biogeochemistry, soil and microbial pools and fluxes.
LOCATION. Study areas were W. Bowman's dry and wet meadow plots south of the
Saddle. Samples and original data are stored at Ramaley Hall.
TIMING. begin 1991, end 1991, weekly during 6-week period in summer.
CITATIONS.
COMMENTS. The components of the sample code were as follows: D=dry meadow,
W=wet meadow, C=control (no nutrient amendments), N=nitrogen amendment,
P=phosporus amendment, NP=nitrogen+phosphorus amendment, 1-5=plot numbers.
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
Note that the plot code nomenclature used in the surveys is slightly
different than the plot code nomenclature used elsewhere in this
file. The code DN5, for example, would be equivalent to n5 in the
second of the 2 listings above.
The temperature data were collected with Russ Monson's Licor data logger
and it appeared to be behaving funky.
Other trace gas data can be found in the files:
http://culter.colorado.edu:1030/exec/.extracttoolA?fertflux.jn
http://culter.colorado.edu:1030/exec/.extracttoolA?methflux.ls
http://culter.colorado.edu:1030/exec/.extracttoolA?subnflux.pb
http://culter.colorado.edu:1030/exec/.extracttoolA?tracegas.ss
\type
statistical
\header
COL1. label=sample code, type=string, units=none, missing value indicator=,
minimum=, maximum=, precision=
COL2. label=date(ddmmyy), type=string, units=none, missing value
indicator=, minimum=, maximum=, precision=
COL3. label=methane flux, type=real, units=umol/m2/hr, missing value
indicator=,absence of value minimum=-2.00, maximum=64.00, precision=+2% or -2%
COL4. label=methane flux, type=real, units=mmol/m2/day, missing value
indicator=absence of value, minimum=-0.05, maximum=1.54, precision=+2% or -2%
COL5. label=water content, type=real, units=%, missing value
indicator=absence of value, minimum=20.4, maximum=82.1, precision=
COL6. label=soil temperature at 1 cm, type=real, units=degrees C, missing
value indicator=absence of value, minimum=10.7, maximum=19.8, precision=
COL7. label=soil temperature at 5 cm, type=real, units=degrees C, missing
value indicator=absence of value, minimum=7.4, maximum=15.5, precision=
COL8. label=soil temperature at 10 cm, type=real, units=degrees C, missing
value indicator=absence of value, minimum=6.0, maximum=10.2, precision=
COL9. label=soil temperature at 15 cm, type=real, units=degrees C, missing
value indicator=absence of value, minimum=3.6, maximum=9.5, precision=
COL10. label=total carbon content (umol C/mg dry weight), type=real,
units=umol/mg, missing value indicator=absence of value, minimum=6.80,
maximum=33.8, precision=
COL11. label=total nitrogen content (umol N/mg dry weight), type=real,
units=umol/mg, missing value indicator=absence of value,
minimum=0.41, maximum=1.84, 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
DC4 120691 2.07 0.050 29.7 14.5 9 6.8 5.6 20.5 0.98
DNP4 120691 0 0.000 43 14.2 8.8 6.6 5.3 20.5 1.08
DP4 120691 0 0.000 30.3 19.1 10.4 7 5.8 6.8 0.59
DN4 120691 0 0.000
DC4 140691 0 0.000
DNP4 140691 0 0.000
DP4 140691 0 0.000
DN4 140691 0 0.000
DC4 100791 0 0.000 9.5 0.41
DNP4 100791 -1.54 -0.037 14 0.77
DP4 100791 -1.68 -0.040 14.9 0.69
DC5 100791 0 0.000 31.5 16.4 0.71
DN4 100791 0 0.000 18.2 0.93
DP5 100791 0 0.000 20.4 10 0.7
DNP5 100791 0 0.000 31.9
DN5 100791 2.65 0.064 36.8
DC4 220791 -1.9 -0.046
DNP4 220791 0 0.000
DP4 220791 -1.5 -0.036
DC5 220791 -2.00 -0.048
DN4 220791 0 0.000
DP5 220791 -1.2 -0.029
DNP5 220791 -1.1 -0.026
DP5 220791 -1.9 -0.046
WC1 280691 5.81 0.139 19.8 14 6 5
WNP1 280691 5.60 0.134 14.1 14.8 9.6 9.5
WN5 280691 2.60 0.062 10.7 7.4 6.1 3.6
WP4 280691 7.59 0.182 19.2 15.5 10.2 7.4
WP3 010791 4.90 0.118 78.7 27.1 1.84
WNP4 010791 5.95 0.143 80 27.9 1.65
WN3 010791 7.82 0.188 82.1 33.8 1.57
WC1 010791 5.52 0.132 67.3 15.7 1.08
WNP1 010791 64.0 1.536 72.2 24.5 1.49
WN5 010791 4.88 0.117 70.8 18.8 1.27
WP5 010791 7.66 0.184 63.5 20.3 1.14
WC1 120791 1.15 0.028
WNP1 120791 0.77 0.018
WN5 120791 0.089 0.002
WP3 120791 -0.11 -0.003
WP4 120791 4.81 0.115
WN3 120791 0 0.000
WNP5 120791 0.64 0.015
WP5 120791 2.42 0.058
WC1 120791 0 0.000
WNP1 120791 4.62 0.111
WN5 120791 0 0.000
WP3 120791 0 0.000
WP4 120791 0 0.000
WN3 120791 0.38 0.009
WNP5 120791 0.5 0.012
WNP5 120791 2.51 0.060