Carbon sink effect of simulated acid rain in lime soil and carbonate rock system
LI Chun-long
ZHAO Jia-mei
LONG Si
CHEN Zhong-ji
ZHOU Yun-chao
ZHANG Chun-lai
Abstract：In order to investigate the influence of rainfall acidity on the carbon sink in a lime soil and carbonate rock system,a leaching test was conducted using lime soil sample developed in pure limestone in Qingyan town and a pure limestone sample of Triassic Daye formation from Huaxi reservoir,Guiyang,comparing to the historical precipitation in Huaxi district,Guiyang.The influence of simulated acid rain on lime soil and the limestone system carbon sink was studied by measuring the HCO-3 content,DOC in the leachates and the soil respiration rate in the lime soil and carbonate rocks system leached over six-months using a range of pre-cipitation acidities and at various depths in the soil.The results showed that,(1)in the homogeneous sample in the soil of 10-50 cm deep ,the content of HCO-3 increased with increased thickness of soil,however the DOC content decreased and the rate of soil respiration increased,indicating that soil thickness significantly affected the carbon sink in the lime soil and carbonate rock system;(2)for pH values ranging 3.5-6.8,the samples had significant differences in carbon emissions increasing precipitation acidity inhibited karstification and organic carbon dissolution,and the karst carbon sink effect decreased;(3)for a daily precipitation range of 90-230 mm,the carbon sink was enhanced with the increased precipitation.
Keywords：lime soil and carbonate rocks systemleaching testcarbon sinksimulating acid rain
Publication Date：2014-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：6( 51-56 )