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- W4246590504 abstract "A study of water and carbon isotopes was conducted in a bare plot in the unsaturated zone of the Yatir Forest in the northern Negev of Israel. Sediment cores were collected in three different seasons. Measurements include profiles of mineralogy, moisture and its δ 18 O and tritium content, dissolved inorganic carbon (DIC) and its δ 13 C (‰) and Δ 14 C (‰) content, and δ 13 C (‰) and Δ 14 C (‰) in the solid sediment. The profiles of moisture and δ 18 O in the cores show clearly the effect of evaporation. The tritium profile indicates infiltration of water (0.11 m yr −1 ). The source of carbon in the DIC is CO 2 released by biotic activity through roots of trees and of seasonal plants, which show seasonal variations, and by decay of organic debris. The δ 13 C (‰) profiles show clearly the chemical transition from dissolved CO 2 (δ 13 C = −22‰) to bicarbonate (δ 13 C = −14‰). At greater depth (–11.3‰), the δ 13 C becomes similar to the δ 13 C in the aquifer below (–12.5‰). The effect of secondary processes is evident in the profile of Δ 14 C in the DIC. It shows a clear decrease with depth due to exchange with the sediment at a rate of 10‰ yr −1 . Precipitation of carbon from the DIC on the sediment is 1.1 mg C L sed −1 yr −1 , negligible compared to the 28 g C in 1 L sed . In the solid sediment, there is a gradient in Δ 14 C carb at the top meter. The net precipitation of 14 C from the DIC on the sediment (0.25 to 1.1‰ yr −1 ), corrected for decay, cannot be observed in the deeper sediment. The presence of 14 C in the top 1 m of the sediment is explained by two possible processes: accumulation of 14 C-tagged dust (∼0.05 mm yr −1 ) and/or long-term cumulative precipitation from the DIC." @default.
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- W4246590504 date "2015-01-01" @default.
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- W4246590504 title "Variations in the Isotopic Composition of Dissolved Inorganic Carbon in the Unsaturated Zone of a Semi-Arid Region" @default.
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- W4246590504 doi "https://doi.org/10.2458/azu_rc.57.18356" @default.
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