Influential factors and spatial suitability of the method of limestone tablets in karst carbon cycle study in China
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ORIGINAL ARTICLE
Influential factors and spatial suitability of the method of limestone tablets in karst carbon cycle study in China Mingyu Shao1,2 · Liankai Zhang1,2 · Pengyu Liu1,2 · Jianhua Cao2 · Xiaoqun Qin1,2 · Qibo Huang1 · Mingming Luo3 · Chunlai Zhang2 Accepted: 20 June 2020 © Springer-Verlag GmbH Germany, part of Springer Nature 2020
Abstract As an intuitive way, the method of limestone tablets (MLT) is often used in dissolution rate calculation and carbon cycle research of carbonate rocks. To clarify the influential factors and spatial suitability of MLT in karst carbon cycle study, 30 MLT test sites in China from north to south were collected and the tablets’ dissolution rate (TDR) was analyzed. The results showed that the influence of precipitation on the TDR is more significant than that of the temperature, especially in the impact on the underground tablets. Three typical river basins, i.e., the Nanchuan River karst basin of northern China (NKB), Qingliangsigou loess basin of northern China (QLB), and Wujiang River karst basin of southern China (WKB) were collected as the key research areas to reveal the regional factors of lithology, soil physical–chemical properties, and land use that affect TDR. The results show that the higher the acid insolubility of rocks, the lower is the dissolution rate. Soil C O2 displayed a positive correlation with TDR in both the northern and southern karst areas of China. Because soil inorganic carbon (SIC) always causes carbon deposits on the tablet surface which made the calculated results of carbon sink inaccurate, the MLT is not suitable for carbon cycle research in the loess area where high SIC is contained. The hydrochemical runoff method may be better selected. In the arid and semi-arid karst basin of northwestern and northern China, the high SIC area should be avoided during carbon sink study with MLT. Keywords Karst carbon cycle · Carbon sink · Method of limestone tablets · Influential factors · Carbonate rocks
Introduction Karstification is the basic process of karst carbon sinks which is the most important link of the global carbon cycle. Many karst scientists attempted to obtain data regarding the karst dissolution rate and to analyze the effect of environmental factors on the dissolution rate (Han and Liu 2004; De Waele et al. 2009; Renforth et al. 2009; Li et al. 2010; Cao * Liankai Zhang [email protected] * Pengyu Liu [email protected] 1
Institute of Karst Geology, CAGS/Key Laboratory of Karst Ecosystem and Rocky Desertification, Ministry of Natural Resources, Guilin 541004, China
2
Ministry of Natural Resources, Guangxi Key Laboratory of Karst Dynamics, Guilin 541004, China
3
School of Environmental Studies, China University of Geosciences, Wuhan 430074, Hubei, China
et al. 2012; Li et al. 2017; Covington and Vaughn 2019). At present, the following methods are used to determine the rate of carbonate dissolution: (1) hydrochemical runoff method (Ellaway et al. 1990); (2) Corbel formula calculation (Corbel 1959); (3) weight
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