\log
This data file was created on 15 May 2009 by Hope Humphries.
\doc
TITLE. Aboveground plant biomass in alpine dry meadow on Niwot Ridge in 2007 for NutNet baseline
ABSTRACT. Pre-treatment sampling of aboveground plant biomass was conducted in 2007 in the NutNet
study site located in dry meadow east of T-van on Niwot Ridge. Aboveground biomass
was clipped from 20x50 cm quadrats. Samples were collected in 5 experimental plots
(out of 10) in each of 4 replicate blocks for a total of 20. Quadrats were placed in the
same subplots used to record species composition. Biomass was recorded as g per 0.1 m2
in live graminoid, dead graminoid, live forb, and Trifolium categories.
INVESTIGATOR. Timothy Seastedt, Institute of Arctic and Alpine Research,
University of Colorado,1560 30th St., Boulder, CO 80309, 303-492-3302,
timothy.seastedt@colorado.edu
VARIABLES. live graminoid, dead graminoid, live forb, Trifolium
KEYWORDS. alpine vegetation, aboveground biomass, NutNet sampling, pre-treatment,
dry meadow, production
LOCATION. Niwot Ridge LTER, East of T-Van,
west bound: 449930, east bound: 450100, north bound: 4433800, south bound: 4433680
TIMING.2007-08-03, static.
CITIATIONS.
COMMENTS. Four replicate blocks were established east of T-van in relatively homogeneous dry meadow
vegetation as the site for the NutNet observational study/experiment. In each block,
10 5x5 m experimental units were marked with sections of white PVC pipe placed at each corner.
Experimental units were separated by a distance of 1 m. The configuration of units within blocks
differed by block (see diagrams of unit locations within blocks). Within each unit, a 2.5x2.5 m
subplot was designated for core sampling; the 20x50 cm sampling area was located within this
subplot in a subsubplot (1x1 m) adjacent to the subsubplot used to record species composition
(see diagrams). Most subplots were located in the northwest corner of the unit. Other locations
were selected when the vegetation of the northwest corner was judged unrepresentative of dry
meadow. A sampling area in block 1 was moved 0.5 m to the east of its northwestern location
to avoid a shrub (unit 8).
Block 1 was located furthest west and closest to T-van, block 2 was east of block 1, block 3 was
north of block 2, and block 4 was northeast of block 3.
Block coordinates (NW corner):
block, latitude, longitude, elevation
1, 40.054273, -105.580908, 3495.9
2, 40.053653, -105.581596, 3491.6
3, 40.053407, -105.581565, 3488.8
4, 40.053020, -105.583370, 3491.0
Samples were collected in 5 of the 10 experimental units in each block for a total of 20.
Aboveground biomass was clipped within 20x50 cm quadrats using a razor. Samples were
separated into live graminoid, dead graminoid, forb (all live), and Trifolium categories; dried;
and weighed. Values for each category were recorded as g/0.1m^2.
Diagrams linked below show unit and subplot locations within blocks but not spatial relationships
among blocks:
http://culter.colorado.edu/images/nutnet_diagram.jpg
\type
statistical
\header
COL1. label=date, type=date, units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
COL2. label=block, type=integer, units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
COL3. label=experimental_unit, type=integer, units=none, missing value indicator=absence of value, minimum=,
maximum=, precision=
COL4. label=subplot, type=string, units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
COL5. label=subsubplot, type=integer, units=none, missing value indicator=absence of value, minimum=, maximum=,
precision=
COL6. label=live_graminoid, type=real, units=g/0.1m2, missing value indicator=absence of value, minimum=,
maximum=, precision=
COL7. label=dead_graminoid, type=real, units=g/0.1m2, missing value indicator=absence of value, minimum=,
maximum=, precision=
COL8. label=live_forb, type=real, units=g/0.1m2, missing value indicator=absence of value, minimum=,
maximum=, precision=
COL9. label=Trifolium, type=real, units=g/0.1m2, 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.
******************************************************************}
\data
2007-08-03,1,6,A,2,4.29,4.59,3.63,0
2007-08-03,1,7,A,2,3.5,5.24,9.25,0
2007-08-03,1,8,A,2,6.78,8.77,3.38,0
2007-08-03,1,9,A,2,0.69,0.42,32.35,2.61
2007-08-03,1,10,A,2,0.84,1.73,10.45,0
2007-08-03,2,6,A,2,3.15,4.18,11.27,0
2007-08-03,2,7,A,2,7.96,6.3,2.74,0
2007-08-03,2,8,A,2,7.26,5.61,7.42,0
2007-08-03,2,9,A,2,6.04,4.32,5.42,0
2007-08-03,2,10,A,2,2.4,3.05,5.92,0
2007-08-03,3,1,B,1,5.34,4.47,1.4,0
2007-08-03,3,3,A,3,2.89,2.23,3.71,0
2007-08-03,3,5,A,3,8.28,6.12,3.12,0
2007-08-03,3,7,A,3,4.34,3.27,7.57,0
2007-08-03,3,9,A,3,10.76,2.95,7.57,0
2007-08-03,4,1,B,1,3.69,3.71,5.63,0
2007-08-03,4,4,A,2,3.47,4.27,14.97,0
2007-08-03,4,5,A,2,1.92,1.82,10.03,0
2007-08-03,4,7,A,2,1.97,2.11,4.97,0
2007-08-03,4,9,B,1,2.89,3.11,7.81,0