Black carbon in a temperate mixed-grass savanna |
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Authors: | X Dai B Glaser W Zech |
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Institution: | a Department of Rangeland Ecology and Management, Texas A&M University, College Station, TX 77843-2126, USA b Institute of Soil Science and Soil Geography, University of Bayreuth, D-95440 Bayreuth, Germany c Texas Agricultural Experiment Station, P.O. Box 1658, Vernon, TX 76384, USA |
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Abstract: | Black carbon (BC) or charcoal is thought to represent an important component of the carbon cycle, but has seldom been quantified in soils. We quantified soil BC in a temperate mixed-grass savanna in the southern Great Plains using benzenecarboxylic acids as molecular markers for BC. Soils were collected from four fire treatments (repeated summer fires in 1992 and 1994; repeated winter fires in 1991, 1993 and 1995; alternate-season fires in winter 1991, summer 1992, and winter 1994; and unburned control) at 0-10 and 10-20 cm depth in 1996. Black carbon concentrations ranged from 50 to 130 g BC kg−1 of soil organic carbon (SOC), or from 0.55 to 1.07 g BC kg−1 of whole soil in this mixed grass savanna. The BC contribution to SOC increased significantly with soil depth (P<0.05). Repeated fires increased BC slightly compared to the unburned controls; however, the effects of repeated fires on BC were not statistically significant in this mixed-grass savanna. Results of this study provide estimates of BC concentrations for native, uncultivated mixed-grass savanna, and indicate that 2-3 fires have little effect on the size of the soil BC pool in this region. |
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Keywords: | Black carbon Prescribed fire Mixed-grass savanna Soil carbon sequestration Soil organic carbon Benzenecarboxylic acids Charcoal Carbon cycle |
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