Transportation characteristics of Î´ 13C in the plants-soil-bedrock-cave system in Chongqing karst area
- Permanent Link:
- Transportation characteristics of Î´ 13C in the plants-soil-bedrock-cave system in Chongqing karst area
- Series Title:
- Science China Earth Sciences
- Li, TingYong
- Publication Date:
- Subjects / Keywords:
- Plants ( local )
Organic Matter ( local )
Soil ( local )
Furong Cave ( local )
Chongqing, China ( local )
- serial ( sobekcm )
- Here we use an analytical method to determine Î´ 13C in local plants and organic matter in the soils above Furong cave, Chongqing, China. We also monitored Î´ 13C in dissolved inorganic carbon (DIC) of drip water, Î´ 13C of active deposits under the drip waters, and the concentration of air CO2 (PCO2). Based on these, we preliminarily studied the transportation characteristics of stable carbon isotope (13C) in cave system of the subtropical karst area. The average Î´ 13C value of 27 local plant samples, which belong to 16 families, was âˆ’32â€° and the weighted Î´ 13C for surface dry biomass was âˆ’33â€°. We found that for 54 soil samples collected from 5 soil profiles, Î´ 13C of soil organic matters was âˆ’22â€°, which could be attributed to the different transportation rates of stable carbon isotopes during the decomposition of plants and organic matters in soils. The relatively lighter 12C tended to transfer into gaseous CO2, which made the relatively heavier 13C concentrated in the soils. On the basis of monitoring of DIC-Î´ 13C in drip waters from July 2009 to June 2010, we found that values in winter months were heavier and values in summer months were lighter in general, the reason of which was that in summer months, both the temperature and the humidity were comparatively higher, resulted in more CO2 with lighter Î´ 13C generated from organic matters decomposition and plants respiration. The average DIC-Î´ 13C value was âˆ’11â€°, about 11â€° heavier than the Î´ 13C of organic matters in soils, which proved that part of DIC in cave drip water was sourced from dissolution of inorganic carbonate (host rock, with heavier Î´ 13C). As for the Î´ 13C of active deposits at five drip water sites in Furong cave, they had almost the same variation with relatively light values. In other words, these active speleothems were deposited at equilibrium conditions for isotopic fractionation. These results suggest that the carbon isotopic information of speleothems could be used to track the evolution of local vegetation in certain situations.
- Original Version:
- Science China Earth Sciences, Vol. 55 (2011-11-18).
- Source Institution:
- University of South Florida Library
- Holding Location:
- University of South Florida
- Rights Management:
- This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.
No images or PDF downloads are available for this resource.
Cras ut cursus ante, a fringilla nunc. Mauris lorem nunc, cursus sit amet enim ac, vehicula vestibulum mi. Mauris viverra nisl vel enim faucibus porta. Praesent sit amet ornare diam, non finibus nulla.
Cras efficitur magna et sapien varius, luctus ullamcorper dolor convallis. Orci varius natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Fusce sit amet justo ut erat laoreet congue sed a ante.
Phasellus ornare in augue eu imperdiet. Donec malesuada sapien ante, at vehicula orci tempor molestie. Proin vitae urna elit. Pellentesque vitae nisi et diam euismod malesuada aliquet non erat.
Nunc fringilla dolor ut dictum placerat. Proin ac neque rutrum, consectetur ligula id, laoreet ligula. Nulla lorem massa, consectetur vitae consequat in, lobortis at dolor. Nunc sed leo odio.