Abstract
Knowledge of the cycling and compartmentalization of soil C that influence C storage may lead to the development of strategies to increase soil C storage potentials. The objective of this study was to use soil hydrolases and soil aggregate fractionation to explore the relationship between C cycling activity and soil aggregate structure. The prairie chronosequence soils were native prairie (NP) and agricultural (AG) and tallgrass prairies restored from agriculture in 1979 (RP-79) and 1993 (RP-93). Assays for β-glucosidase (E.C. 3.2.1.21) and N-acetyl-β-glucosaminidase (NAGase, EC 3.2.1.30) activities were conducted on four aggregate size fractions (>2 mm, 1–2 mm, 250 μm–1 mm, and 2–250 μm) from each soil. There were significantly greater amounts of >2-mm aggregates in the RP-79 and RP-93 soils compared to the NP and AG soils due to rapid C accumulation from native plant establishment. Activities for both enzymes (μg PNP g−1 soil h−1) were greatest in the microaggregate (2–250 μm) compared to the macroaggregate (>2 mm) fraction; however, microaggregates are a small proportion of each soil (<12%) compared to the macroaggregates (∼75%). The RP soils have a hierarchical aggregate system with most of the enzyme activity in the largest aggregate fractions. The NP and AG soils show no hierarchical structure based on aggregate C accretion and significant C enzyme activity in smaller aggregates. The distribution of enzyme activity may play a role in the storage of C whereby the aggrading restored soils may be more susceptible to C loss during turnover of macroaggregates compared to the AG and NP soils with less macroaggregates.
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Acknowledgements
This research was supported by the Carbon Sequestration in Terrestrial Ecosystems Program, Office of Biological Research, US Department of Energy (DOE). Pacific Northwest National Laboratory is operated for the DOE by Battelle Memorial Institute under contract number DE-AC05-76RL01830. The authors are grateful to J.D. Jastrow for facilitating access to the Native Prairie site and to R. Walton for access to the Fermi Laboratory site.
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Fansler, S.J., Smith, J.L., Bolton, H. et al. Distribution of two C cycle enzymes in soil aggregates of a prairie chronosequence. Biol Fertil Soils 42, 17–23 (2005). https://doi.org/10.1007/s00374-005-0867-2
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DOI: https://doi.org/10.1007/s00374-005-0867-2