HR: 1340h
 AN: B23B-1267    [Abstracts]
 TI: Climatically Driven Loss of Calcium in Steppe Soil.
 AU: * Lapenis, A G
 EM: andreil@albany.edu
 AF: University at Albany, 1400 Western Ave, Albany, NY 12222, United States
AU: Lawrence, G
 EM: glawrenc@usgs.gov
 AF: US Geologic Survey, 425 Jordan Road, Troy, NY 12180, United States
AU: Baily, S
 EM: sbailey/ne_du@fs.fed.us
 AF: USDA Forest Service, Hubbard Brook Experimental Forest, Durham, NH 03223, United States
AU: Aparin, B
 EM: sverchok131@yandex.ru
 AF: Central Dokuchaev's Soil Museum, Birzhevoi pr., St. Petersburg, 194295, Russian Federation
AU: Shiklomanov, A
 EM: alex.shiklomanov@unh.edu
 AF: University of New Hampshire, Complex Systems Research Center, Durham, 03824, United States
AU: Speranskaya, N
 EM: ecoshelf@pop3.rcom.ru
 AF: State Hydrologic Institute, 23 Second Ln., St. Petersburg, 194295, Russian Federation
AU: Torn, M
 EM: mstorn@lbl.gov
 AF: Lawrence Berkeley National Laboratory, 310 Barrows Hall, Berkeley, CA 94720-3, United States
AU: Calef, M
 EM: mc969295@albany.edu
 AF: University at Albany, 1400 Western Ave, Albany, NY 12222, United States
AB: Analysis of archived soil samples collected in Kemannaya Steppe Preserve in 1920, 1947, 1970, and fresh samples collected in 1998 indicated that the native steppe soil lost 17-28 kg m-2 of calcium in the form of carbonates in 1970-1998. Here we demonstrate that the loss of calcium was caused by fundamental shift in the steppe hydrologic balance. Previously unleached soils where precipitation was less than potential evapotranspiration are now being leached due to increased precipitation and, possibly, due to decreased actual evapotranspiration. Because this region receives low levels of acidic deposition, the dissolution of carbonates involves the consumption of atmospheric CO2. Our estimates indicate that this climatically driven terrestrial sink of atmospheric CO2 is ~ 2.2 – 8.0 g C m-2 yr-1. In addition to the net sink of atmospheric carbon, leaching of pedogenic carbonates significantly amplified seasonal amplitude of CO2 exchange between atmosphere and steppe soil.
UR: http://www.albany.edu/faculty/alapenis/research/Natpark/index.html
DE: 0486 Soils/pedology (1865)
 SC: Biogeosciences [B]
 MN: 2007 Fall Meeting