Weathering controls on mechanisms of carbon storage in grassland soils Page: 23 of 30
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Table 3: Radiocarbon, 613C, bulk density, and percent organic carbon data. Italics
indicates missing data points; values are calculated via averaging horizons above
and below. These soils contained no carbonates therefore no acidification step
was used in measurement of organic carbon. Terrace MT-SP 4b is identified in
other publications as terrace WP-R.
Terrace: MT-SP5 240 ka
horizon bulk
sample horizon bottom rho pH %OC V'C A4C FM
0-15 Al 15 1.10 5.31 6.868 -26.4 -56.7 0.9504
15-33 A2 33 0.90 5.26 6.319 -25.9 -143.8 0.8622
33-63 AB 63 1.00 5.35 4.44 -25.7 -202 0.8034
63-90 AB2 90 1.00 5.43 4.145 -25.5 -260.3 0.7446
90-128 Bw 128 1.40 5.57 2.377 -25.4 -429.2 0.5745
128-173 Bt 173 1.40 5.09 0.15 -25.05 -559 0.4437
173-200 Bg 200 1.60 5.33 0.149 -24.7 -688.9 0.3129
200-231 Bsl 231 1.60 5.78 0.167 -24.7 -711.1 0.2907
231-246 Bs2 246 1.50 5.62 0.02 -24.45 -657 0.3447
246-257 BCg 257 1.70 5.84 0.075 -24.2 -603.4 0.3987
257-282 BCg 282 1.70 6.20 0.073 -24.8 -674.6 0.3274
Terrace: WP-O 118 ka
horizon bulk
sample horizon bottom rho pH %OC S'3C A4C FM
0-15 Al 15 1.1 4.84 6.833 -25.9 -121.3 0.885
15-40 A2 40 1.2 5.05 6.622 -25.6 -170.9 0.8347
40-80 A3 80 1.1 5.08 5.947 -25.5 -207.4 0.7979
80-98 ABI 98 1.1 5.19 3.736 -25.2 -301.5 0.703
98-127 AB2 127 1.2 5.08 3.663 -25.2 -350.8 0.6533
127-151 Btl 151 1.4 5.47 0.577 -23.6 -483.2 0.5193
151-195 Bt2 195 1.4 5.55 0.182 -23.4 -488.1 0.5143
195-250 C 250 1.5 5.35 0.111 -23 -509.1 0.493
Terrace: MT-SP 4a 124 ka
horizon bulk
sample horizon bottom rho pH %OC S'3C A4C FM
0-19 Al 19 0.90 4.82 7.07 -25 -62.8 0.9428
19-44 AB1 44 1.00 5.12 5.51 -24.8 -185.8 0.8191
44-61 AB2 61 0.90 5.26 4.72 -25.2 -213.8 0.7910
61-97 Bwl 97 1.30 5.67 0.96 -24.6 -422.5 0.5810
97-132 Bw2 132 1.30 5.17 0.4 -24.3 -447.6 0.5558
132-182 Bw3 182 1.30 5.19 0.24 -23.8 -500.4 0.5027
182-270 BC1 270 1.40 5.22 0.21 -24.6 -752.8 0.2487
270-320 BC2 320 1.40 - 0.62 -25.6 -294.2 0.7101
Terrace: MT-SP 4b 124 ka
horizon bulk
sample horizon bottom rho pH %OC S'3C A4C FM
0-16 Al 16 1.00 5.08 8.212 -26.6 -27.3 0.9787
16-49 A2 49 1.00 5.11 6.292 -25.8 -182.6 0.8224
49-65 A3 65 1.00 5.09 6.546 -25.8 -201.8 0.8031
65-108 AB 108 1.00 5.34 4.142 -25.5 -324.2 0.6799
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Masiello, C. A.; Chadwick, O. A.; Southon, J.; Torn, M. S. & Harden, J. W. Weathering controls on mechanisms of carbon storage in grassland soils, article, September 1, 2004; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc780503/m1/23/: accessed April 19, 2024), University of North Texas Libraries, UNT Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.