This project was designed to investigate the response of plant growth and reproduction to short- and long-term variation in biotic and abiotic environmental variables. Several perennial taxa, including tree (Juniperus monsperma and Pinus edulis), shrub (Larrea tridentata) and bunch grasses (Oryzopsis hymenoides (now Achnaterum hymenoides) and Sporobolus contractus) species, were monitored at 1-3 sites differing in elevation and topography as well as edaphic variables and annual precipitation. The sites represented optimal or marginal/transitional zones for particular species. Demographic measurements were made biannually, after the 'wet' (fall) and 'dry' (spring) seasons. For tree and shrub species, estimates of growth and reproduction were based on branch demography, with ten branch tips from 10-20 individuals per species per site repeatedly measured from 1989-1993. For J. monsperma, P. edulis and L. tridentata, vegetative growth (i.e., branch growth) as well as reproduction were monitored. Additional measurements included needle length for P. edulis and leaf production, leaf size and branchlet production for L. tridentata. For grasses, basal diameter, leaf length and reproduction were monitored for 100 individuals per species per site.
This project, SEV024, contains only data on creosote branch dimensions. Data on other variables and species is contained in SEV006, SEV025, SEV026, SEV027, and SEV028.
The size measurement data were collected to provide a baseline for measuring change in plant size in subsequent years of this project. Creosote demography data will be used in conjunction with data in the larger Sevilleta plant demography and plant physiology databases.
In 1989, at each of the two demography study sites, Five Points and Rio Salado, 100 creosote (Larrea tridentata) bushes were numbered in five lines of 20. All 200 individuals across the two sites were measured for branch demography. Bushes at both sites were re-measured in 1993. In 1999, bushes at the Five Points site were remeasured; only 81 out of the 100 bushes could be relocated. The locations of each of these 81 individuals were GPS'ed. Bushes at Five Points were also re-measured in 2003 and 2008.
The three measurements made at each plant were height, large diameter, and small diameter.
HEIGHT - The maximum height of the bush in centimeters.
LARGE DIAMETER - The largest diameter of the shrub crown in centimeters.
SMALL DIAMETER - The smallest diameter of the shrub crown in centimeters.
1989 File initiated by Troy Maddux 9 Nov 1992.
Documentation started and data taken from existing file - Troy Maddux 9 Nov 1992.
Documentation outline imported and partially filled in - 18 Feb 1993, Troy Maddux 1993.
Data entered by Karyn Kolman on 9 June 1993.
File initiated and data entered by Doug Moore - Nov 5 1999.
File initiated by Doug Moore 22 Aug 2000.
Documentation started, data taken from existing file and dbf file created - Doug Moore 22 Aug 2000
Meta data from previous collections modified and added to data by D. Moore Sep 8 2000.
11 Jan 10 -Data from all years combined and QA/QC'd. - For missing data -888 was used. -A. Swann.
23 Feb 11 -1993,fp,LATR2 1,0,113,127,126 changed to 1993,fp,LATR2 100,113,127,126 and 1993,rs,LATR2 1,0,125,150,130 changed to 1993,rs,LATR2 100,125,150,130. -J. Mulhouse
A field crew operated by Troy Maddux collected the initial data. Troy Maddux and James Brunt were the original data managers.
1999 data were collected by Joy Francis Greg Shore, and Doug Moore. The metadata was created by Doug Moore on 8 Sep 2000.
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