\log
The initial iteration of the documentation section was created by Rick
Ingersoll on 1 March 1995.[RCI 1 March 1995] Additional information
supplied by Jeff Welker was incorporated into the documentation, the
1993 and 1994 data were appended to the data section, and the file was
put under sccs control on 25 April 1995.[RCI 25 April 1995] URL locations
for related data were updated on 26 September 2000.[MAH 26 September 2000]
\doc
TITLE. International Tundra Experiment: Reproductive shoot response of
Dryas octopetala to increased summer temperature and precipitation.
ABSTRACT. The International Tundra Experiment (ITEX) is a consortium of
research sites seeking to understand the response of tundra plant
populations to changes in growing season temperatures through a simple
temperature manipulation and transplant experiment. The research goal
is to examine the phenologic and reproductive responses of a set of
species to experimentally-induced warming at a network of sites.
The ITEX design is hierarchical, with sites participating at whatever
level they are able. At the minimum, participation in ITEX requires
climate monitoring (using the LTER MSR standards), a temperature
manipulation using one of three possible designs, and monitoring
phenologic and reproductive variables for at least one designated
ITEX species or two other species. The temperature manipulation
is achieved through use of conical or hexagonal open-top chambers
of solar fiberglass, which have been shown to increase the air
temperature at the surface approximately 3 degrees C. Dry tundra east
of the Saddle on Niwot Ridge is being subjected to increased summer
temperatures using ITEX chambers and a portion of the experimental
plots are receiving supplemental summer rainfall at 50% above the
long-term June + July + August precipitation total. Chambers increase
summer air temperatures on average by 2.5 degrees Celsius, while soil
temperatures are increased by 1.8 degrees Celsius. Organismic
responses including the vegetative and reproductive responses of Dryas
are being assessed and ecosystem carbon flux, soil solutions, and soil
nitrogen content are being measured. This site is part of a Dryas
transect of ITEX study locations including Toolik Lake, AK; Svalbard,
Norway; Latnaja, Sweden; and Ellesmere Island, Canada.
INVESTIGATOR. Jeff Welker, NREL, Colorado State University, Fort
Collins, CO, 80523, (303) 491-1019, FAX: (303) 491-1965,
jeff@NREL.ColoState.EDU.
VARIABLES. number of reproductive shoots, reproductive shoot length, weight
of reproductive shoots, total number of seeds, total weight of seeds, mean
weight per seed.
KEYWORDS. ITEX (International Tundra Experiment), ecosystem, organismic biology, warming effects, plant development, reproduction, plant growth, plant production, disturbance.
LOCATION. Study area is approximately 50 m to the north of the East Knoll,
which is east of the Saddle on Niwot Ridge. Samples and original data are
stored at NREL, Colorado State University.
TIMING. begin June 1993, ongoing, once in each plot during the
growing season.
CITATIONS.
COMMENTS. These data were manually entered from laboratory data sheets
using an EasyEntry form; see "The Management of NWT LTER Data on
the PC" for more detailed information. The resultant files were
processed and archived on culter (NWT LTER workstation); see "The
Management of NWT LTER Data on culter" for more detailed
information.
Chamber placement was initiated in June 1993. Chambers were removed in
late September of each year.
Vegetative response data can be found in
http://culter.colorado.edu:1030/exec/.extracttoolA?itexdveg.jw
on culter. Additional ITEX data can be found at:
http://culter.colorado.edu:1030/exec/.extracttoolA?itexphen.mw
http://culter.colorado.edu:1030/exec/.extracttoolA?itexptqd.mw
http://culter.colorado.edu:1030/exec/.extracttoolA?itexquan.mw
Treatment codes are -T-W (control), -T+W (added water), +T-W (increased
temperature), +T+W (increased temperature and added water), and ASYM
(increased night temperature).
Reproductive shoot number is the arbitrary integer given to a individual
reproductive shoot for a particular treatment code-year-replicate
combination. Thus, the total number of reproductive shoots for a given
treatment code-year-replicate combination can be found in the last
record for that treatment code-year-replicate combination.
Total number of seeds, total weight of seeds, and mean weight per seed
are based on all reproductive shoots for a given treatment code-year-
replicate combination. The warming chambers are placed over the
experimental plots which can be identified by coordinates given.
In July 2002, Wade Cooper and Mariah Carbone placed 4, 8 inch
metal stakes in the ground around the outside of each chamber for
easy identification of the experimental plots. Within the plots, there
are 4 tags with crosshairs, and 4 plain washers nailed into the ground.
Place the chamber within the 4 metal stakes, then align the chamber
edges with the plain washers. Each of the crosshair tags should be
several inches within the edge of the chamber. Securely nail the
chamber into the ground with stakes and wire ties.
\type
statistical.
\header
COL1. label=treatment code, type=string, units=none, missing value
indicator=absence of value, minimum=, maximum=, precision=
COL2. label=sample year, type=integer, units=none, missing value
indicator=, minimum=1994, maximum=, precision=
COL3. label=replicate, type=integer, units=none, missing
value indicator=, minimum=, maximum=, precision=
COL4. label=reproductive shoot number, type=integer, units=none, missing
value indicator=absence of value, minimum=1, maximum=, precision=
COL5. label=reproductive shoot length, type=real, units=cm, missing
value indicator=absence of value, minimum=, maximum=, precision=
COL6. label=reproductive shoot weight, type=real, units=g, missing value
indicator=absence of value, minimum=, maximum=, precision=
COL7. label=total number of seeds, type=integer, units=none, missing value
indicator=absence of value, minimum=, maximum=, precision=
COL8. label=total weight of seeds, type=real, units=g, missing value
indicator=absence of value, minimum=, maximum=, precision=
COL9. label=mean weight per seed, type=real, units=g, missing value
indicator=absence of value, 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.
******************************************************************}
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-T+W,1994,5,2,07.0,0.0302,135,0.0556,0.0004
-T+W,1994,5,3,07.7,0.0317,135,0.0556,0.0004
-T+W,1994,5,4,06.7,0.0201,135,0.0556,0.0004
-T+W,1994,5,5,09.0,0.0319,135,0.0556,0.0004
-T+W,1994,5,6,08.3,0.0246,135,0.0556,0.0004
-T+W,1994,5,7,07.1,0.0224,135,0.0556,0.0004
-T+W,1994,5,8,04.6,0.0157,135,0.0556,0.0004
-T+W,1994,5,9,05.0,0.0219,135,0.0556,0.0004
ASYM,1994,1,1,07.5,0.0209,049,0.0217,0.0004
ASYM,1994,1,2,07.2,0.0313,049,0.0217,0.0004
ASYM,1994,1,3,08.7,0.0343,049,0.0217,0.0004
ASYM,1994,1,4,01.9,0.0066,049,0.0217,0.0004
ASYM,1994,2,1,07.0,0.0271,147,0.0675,0.0005
ASYM,1994,2,2,07.8,0.0295,147,0.0675,0.0005
ASYM,1994,2,3,09.2,0.0352,147,0.0675,0.0005
ASYM,1994,2,4,09.2,0.0347,147,0.0675,0.0005
ASYM,1994,3,1,07.3,0.0393,074,0.0381,0.0005
ASYM,1994,3,2,09.2,0.0423,074,0.0381,0.0005
ASYM,1994,3,3,07.1,0.0303,074,0.0381,0.0005
ASYM,1994,3,4,08.4,0.0369,074,0.0381,0.0005