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Unformatted text preview: fix it (convert to useable form, organic version) atmosphere • 2 carbon isotopes C12 & C13 Atmosphe re Plant s C3 (cool grass) C4 (warm grass) C12 99% 99.5% 99.8% 99.2% C13 1% 0.5% 0.2% 0.8% • Plants discriminate against C13; C3 plants discriminate more than C4 plants • Organic matter in soil is (mostly) plant derived; lower organic matter is older than higher; soil depth can tell age • C12 & C13 in organic matter can tell if there were more warm or cool season plants at a certain time which can tell temperature changes...
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This note was uploaded on 11/14/2010 for the course NRM 3501 taught by Professor Wester during the Fall '09 term at Texas Tech.
- Fall '09