Ecological Survey of Central Arizona: a survey of key ecological indicators in the greater Phoenix metropolitan area and surrounding Sonoran desert, ongoing since 1999 (Reformatted to a Darwin Core Archive)

This data package is formatted as a Darwin Core Archive (DwC-A,
event core). For more information on Darwin Core see
https://www.tdwg.org/standards/dwc/. This Level 2 data package was
derived from the Level 1 data package found here: https://pasta.lternet.edu/package/metadata/eml/edi/247/3,
which was derived from the Level 0 data package found here:
https://pasta.lternet.edu/package/metadata/eml/knb-lter-cap/652/3. The abstract below was extracted from the Level 0
data package and is included for context: The Ecological Survey of Central Arizona (ESCA) is an extensive field survey and
integrated inventory designed to capture key ecological indicators of the CAP LTER study
area consisting of the urbanized, suburbanized, and agricultural areas of metropolitan
Phoenix, and the surrounding Sonoran desert. The survey, formerly known as the survey 200
and renamed to ESCA in 2015, is conducted every five years at approximately 200 sample plots
(30m x 30m) that were located randomly using a tessellation-stratified dual-density sampling
design. Study plots cover habitats throughout the CAP LTER study area ranging from native
Sonoran desert sites to residential yards to an airport tarmac. Measurements include an
inventory of all plants (identified to the lowest possible taxonomic unit, typically
species), plant biovolume, soil coring for physicochemical properties, arthropod sweep-net
sampling, photo documentation, and a visual survey of site and area characteristics. The
objectives of the survey are to (1) characterize patches in terms of key biotic, physical,
and chemical variables, and (2) examine relationships among land use, general plant
diversity, native plant diversity, plant biovolume, soil nutrient status, and
social-economic indices along an indirect urban gradient. A pilot survey was conducted in 1999, and the first full ESCA was conducted in 2000.
The maiden survey in 2000 featured a suite of measurements that were not assessed in later
surveys, including data from a portable weather station set up during the field survey at
each location, organic matter decomposition, pollen, and mycorrhizae. In 2010, the survey
was expanded to include an assessment of one of the residential parcels overlapping the
survey plot at sites in residential areas. Many of the same variables that are measured in
the 30m x 30m survey plot are measured in the parcel, including an inventory of perennial
plants, and the biovolume of trees. In addition, a detailed assessment of characteristics of
the parcel is performed. Investigators interested in the additional variables assessed in the 2000 ESCA, in
parcel data collected in the 2010 and subsequent surveys, or in soil data collected during
the 2000 ESCA (encapsulated in a separate data set owing to a different reporting format)
should search the data catalog for 'ecological survey of central arizona' or 'survey 200' to
locate those and other data related to the CAP LTER's ESCA.