Variation of δ13C in karst soil in Yaji Karst Experiment Site, Guilin |
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Authors: | Genxing Pan Shiyi He Jianhua Cao Yuxiang Tao Yuhua Sun |
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Institution: | (1) College of Resource and Environment Science, Nanjing Agricultural University, 210095 Nanjing, China;(2) Karst Dyanmics Laboratory, Ministry of Land and Resources, 541004 Guilin, China |
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Abstract: | This study deals with δ13 C variation in karst soil system of Yaji Karst Experiment Site, Guilin, a typical region of humid subtropical karst formations.
Samples of near ground air, plant tissue, soil and water (soil solution and karst spring) were respectively collected on site
in different seasons during 1996–1999. Considerable variation of δ13 C values are not only found with different carbon pools of soil organic carbon, soil air CO2 and soil water HCO3−, but also with the soil depths and with different seasons during a year. The °13 C values of CO2 both of near ground air and soil air are lower in July than those in April by 1‰–4‰ PDB. Our results indicate that the δ13 C values of carbon in the water and air are essentially dependent on interface carbon interaction of air-plant—soil-rock—water
governed by soil organic carbon and soil CO2 in the system. |
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Keywords: | karst soil carbon δ 13C |
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