Enzyme activities and carbon dioxide flux in a Sonoran desert urban ecosystem

Douglas Green, Michelle Oleksyszyn

Research output: Contribution to journalArticle

36 Citations (Scopus)

Abstract

Urban expansion into wildlands significantly changes soil processes such as nutrient cycling and organic matter processing. Knowledge of these changes is important so that the impact of urbanization on ecosystems may be assessed. We measured the activities of invertase, cellulase, and CO2 flux in mesiscape, xeriscape, and in remnant desert patches in a rapidly urbanizing south central Arizona Sonoran desert ecosystem. In this system, mesiscapes are irrigated watered lawns, xeriscapes include low water-use vegetation, and desert remnants include undeveloped areas within the urban matrix. Invertase activity ranged from 2.4 to 15 mg glucose equivalents (GE) g-1 24 h-1. Invertase activities in mesiscapes during January exceeded desert remnant sites by a factor of six and xeriscape sites by a factor of two. Cellulase activity ranged from 48 to 406 μg GE g-1 24 h-1. Cellulase activity in mesiscapes during January significantly exceeded desert remnant and xeriscape sites by a factor of two. Mesiscape soils were up to 18.4°C cooler than xeriscape soils and had the lowest average temperatures (20.7°C). The average temperature of desert remnant soils was 27.4°C. Over the study period, CO2 flux rates ranged from 0.212 to 1.760 g m-2 h-1. Maximum rates of CO2 flux rates occurred in the spring and summer, and flux rates were lowest during the winter months. Winter peaks of enzyme activity are attributed to the onset of dormancy in C-4 grasses in the fall and establishment of winter lawns by homeowners.

Original languageEnglish (US)
Pages (from-to)2002-2008
Number of pages7
JournalSoil Science Society of America Journal
Volume66
Issue number6
StatePublished - Nov 2002

Fingerprint

Sonoran Desert
urban ecosystem
enzyme activity
deserts
beta-fructofuranosidase
desert
carbon dioxide
endo-1,4-beta-glucanase
ecosystems
urbanization
winter
homeowners
desert soils
glucose
soil
desert soil
coolers
homeowner
ecosystem
dormancy

ASJC Scopus subject areas

  • Soil Science
  • Earth-Surface Processes

Cite this

Enzyme activities and carbon dioxide flux in a Sonoran desert urban ecosystem. / Green, Douglas; Oleksyszyn, Michelle.

In: Soil Science Society of America Journal, Vol. 66, No. 6, 11.2002, p. 2002-2008.

Research output: Contribution to journalArticle

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