In an effort to better quantify NPP of Creosotebush in the Five-Points region, it was decided to test the Point-Quarter method against the standard 1-m2 quadrat method that has been in use since 1998. Transects were laid out across the 5 mammal trapping webs as well as across burned and unburned plots of the Mixed Shrub site (MS). Repeat measures of the same bushes are performed seasonally. Whole shrubs of various size classes are collected and sorted and weighed to develop regressions for biomass.
Shrub Harvesting Creosote shrubs of various size classes are measured . Height of the shrub is measured as well as the diameter of the crown at its widest point and also a diameter perpendicular to this first diameter. The shrubs are then harvested.
Sorting and Drying Creosote shrubs are separated into leaves, twigs (small stems that are left after removing all of the green leaves), and stems (the large main stems of creosote. After the samples are sorted they are dried for up to five days.
Weights and Measurements The dry weight for all samples leaves, twigs, and stems are recorded. For each stem sample, the length (cm) of each stem is measured and recored as total stem length (the sum of all stems). A small, medium, and large bush from both burned and unburned treatments are randomly selected for future C/N analysis.
January 2009: All data sets (Winter, Spring, and Fall) for 2007-2008 were combined, checked for errors, and imported into Navicat. Variables site was added and burned and unburned were used as treatments instead. Any calculated measurements (i.e. volume, twig+leaf weight, etc.) were removed from data set. -Changed missing data on volume and weightt due to plant being dead to -888. -Changed missing data on volume and weight due to human error to -999. -- A. Swann
Data were scanned by eye to catch mistakes. Data were then filtered in excel to determine if all parameters were met. Data were combined and imported into Navicat using the import wizard.
Additional Personnel Associated with the Data Collection / Data Processing
Sevilleta Field Crew Employee History
Chandra Tucker, April 2014-present, Megan McClung, April 2013-present, Stephanie Baker, October 2010-Present, John Mulhouse, August 2009-June 2013, Amaris Swann, August 25, 2008-January 2013, Maya Kapoor, August 9, 2003-January 21, 2005 and April 2010-March 2011, Terri Koontz, February 2000-August 2003 and August 2006-August 2010, Yang Xia, January 31, 2005-April 2009, Karen Wetherill, February 7, 2000-August 2009, Michell Thomey, September 3, 2005-August 2008, Jay McLeod, January 2006-August 2006, Charity Hall, January 31, 2005-January 3, 2006, Tessa Edelen, August 15, 2004-August 15, 2005, Seth Munson, September 9, 2002-June 2004, Caleb Hickman, September 9, 2002-November 15, 2004, Heather Simpson, August 2000-August 2002, Chris Roberts, September 2001-August 2002, Mike Friggens, 1999-September 2001, Shana Penington, February 2000-August 2000.
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