SOC is comprised of the historic accumulation of humus in the soil. Several studies have evaluated C sequestration potential of agricultural and urban soils as one of several options to stabilize atmospheric CO 2 abundance ( Blanco-Canqui and Lal, 2004 Bruce et al., 1999 Lal, 2004a, 2008 Leified, 2006 Pataki et al., 2006 Pickett et al., 2008 Pouyat et al., 2002, 2006 Smith et al., 1993). A simple C footprint benchmark of home lawns can be developed from three components: the capacity of urban soils to store C, the capability of grass plants to fix and sequester C, and the C footprint of lawn maintenance practices. Lawn grasses are the predominant plants in the urban landscape that are managed by the homeowner ( Beard, 1973). population lives in urban areas where individuals can potentially affect C sequestration in their home landscape ( United States Census Bureau, 2010). The interest in urban soils is derived from the fact that 75% of the U.S.
SOC sequestration is one of the strategies proposed to stabilize atmospheric carbon dioxide (CO 2) ( Lal, 2004a Smith et al., 2007b). Research on abrupt climate change and the C cycle have become major thematic foci since the 1990s. Keywords: soil C sequestration global warming lawn management turfgrass hidden C costs Lawns can be a net sink for atmospheric CO 2 under all three evaluated levels of management practices with a national technical potential ranging from 25.4 to 204.3 g C/m 2/year.
High management, based on university and industry-standard best management recommendation practices (BMPs), had a net SOC sequestration rate of 51.7 to 204.3 g C/m 2/year. The rate of SOC sequestration for do-it-yourself (DIY) management by homeowners was 80.6 to 183.0 g C/m 2/year. Low management with minimal input (MI) included mowing only, a net SOC sequestration rate of 25.4 to 114.2 g C/m 2/year. Lawn maintenance practices ranged from low to high management. The net SOC sequestration rate was assessed by subtracting the HCC from gross SOC sequestration rate. Hidden C costs are the amount of energy expended by typical lawn management practices in grams of carbon equivalents (CE)/m 2/year and include practices including mowing, irrigating, fertilizing, and using pesticides. Additional C sequestration can result from biomass gains attributable to fertilizer and irrigation management. The average SOC sequestration rate for U.S. Net SOC sequestration in lawn soils was estimated using a simple mass balance model derived from typical homeowner lawn maintenance practices.
home lawns was determined from SOC sequestration rates of turfgrass and grasslands. The potential of SOC sequestration for U.S. The model contrasted gross C sequestered versus the hidden C costs (HCC) associated with typical lawn maintenance practices. A model was developed to investigate the potential of C sequestration in home lawns. Soil organic carbon (SOC) sequestration and the impact of carbon (C) cycling in urban soils are themes of increasing interest.
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