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Drivers of soil carbon in residential ‘pure lawns’ in Auburn, Alabama

Author:
Huyler, Ann, Chappelka, Arthur H., Prior, Stephen A., Somers, Greg L.
Source:
Urban ecosystems 2014 v.17 no.1 pp. 205
ISSN:
1083-8155
Subject:
carbon, Alabama, urban areas, subtropics, soil texture, residential areas, nitrogen, land use, irrigation, chronosequences, carbon sequestration, ecosystems, lawns and turf, mulching, residential housing, soil depth, soil nutrient dynamics, trees
Abstract:
Urban land area is expanding worldwide and may contribute to long-term carbon (C) storage; however, little is known about potential drivers of soil C in urban areas. Residential areas are one of the largest urban land use zones and lawns can provide stable chronosequences for studying soil C dynamics. In residential lawns containing no trees (n = 23), the relationships between soil C and four potential drivers [home age (1–51 years), yard maintenance practices (fertilization, irrigation, and bagging or mulching lawn clippings), soil nitrogen (N) and soil texture] were investigated. Soil C increased with home age at 0–15 cm depth by 0.026 kg C m⁻² yr⁻¹, declined by −0.011 kg C m⁻² yr⁻¹at 15–30 cm depth, and was stable at 30–50 cm depth. Soil C had a positive relationship with soil N (R² = 0.55) at the 0–15 cm depth. Soil C and N were not related to yard maintenance practices or soil texture. The low soil C sequestration rate and limited relationships between soil C and home age, yard maintenance, soil N and soil texture may have resulted from the positive influence of Auburn’s humid, subtropical climate on residue decomposition.
Agid:
62454
Handle:
10113/62454