NDLI: A comparative study of soil carbon transfer between forest soils in subtropical karst and clasolite areas and the karst carbon sink effect in Guilin, Guangxi, China

Content Provider	Springer Nature Link
Author	Yang, Hui Zhou, Li Huang, Liying Cao, Jianhua Groves, Chris
Copyright Year	2014
Abstract	Elucidating soil carbon cycle in karst areas has been a major research focus, while the relationship between karst soil carbon transfer and karst carbon sinks is unclear. A comparative study of soil respiration rates, δ $^{13}$C values of CO$_{2}$ from soil respiration, and CO$_{2}$ concentrations in forest soil layers was conducted from September 2006 to August 2008 between karst and clasolite areas of the Maocun karst underground river catchment. The main results are as follows: (1) the soil respiration rate in limestone soil from the karst area is apparently lower than that in red soil from the clasolite area. The soil respiration rate in the karst area varied from 23.12 to 271.26 mgC/m$^{2}$ h, with an average of 111.57 mgC/m$^{2}$ h, while the soil respiration rate in the clasolite area varied from 51.60 to 326.28 mgC/m$^{2}$ h, with an average of 148.99 mgC/m$^{2}$ h. Taking the averages into account, the soil respiration rate in limestone soil was 25.12 % less than that in red soil; (2) the δ $^{13}$C values of soil respiration in the karst and clasolite areas were −29.35 to −18.26‰ and −29.21 to −22.60‰, respectively, with respective mean values of −22.68 and −26.21‰. The δ $^{13}$C value of soil respiration in the karst area was heavier than that in the clasolite area; (3) the CO$_{2}$ concentration of limestone soil profiles had a bi-directional gradient, which was more obvious in seasons with good moisture and air temperature conditions. In contrast, the CO$_{2}$ concentration of red soil profile had a uni-directional gradient, that is to say, the deeper the red soil layer, the higher the CO$_{2}$ concentration. Taking into account the mean values of CO$_{2}$ concentration, the CO$_{2}$ concentration of limestone soil ranged between 0.05 and 0.60 %, with an annual average of 0.25 %. The CO$_{2}$ concentration of red soil ranged between 0.05 and 1.09 %, with an annual average of 0.57 %, which indicated that the lower soil layer CO$_{2}$ could be consumed and absorbed by carbonate rock dissolution at the soil/rock interface in the karst area. In other words, karst processes in soil represented one of the carbon sinks.
Starting Page	921
Ending Page	928
Page Count	8
File Format	PDF
ISSN	18666280
Journal	Environmental Earth Sciences
Volume Number	74
Issue Number	2
e-ISSN	18666299
Language	English
Publisher	Springer Berlin Heidelberg
Publisher Date	2014-12-03
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Karst area Clasolite area Soil respiration δ $^{13}$C value Soil CO$_{2}$ concentration Geology Hydrology/Water Resources Geochemistry Environmental Science and Engineering Terrestrial Pollution Biogeosciences
Content Type	Text
Resource Type	Article
Subject	Global and Planetary Change Earth-Surface Processes Soil Science Environmental Chemistry Pollution Geology Water Science and Technology

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