Characteristics of an Inorganic Carbon Sink Influenced by Agricultural Activities in the Karst Peak Cluster Depression of Southern China (Guancun)

Ning Zhang, Qiong Xiao (), Yongli Guo, Pingan Sun, Ying Miao, Fajia Chen and Cheng Zhang ()
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Ning Zhang: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Qiong Xiao: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Yongli Guo: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Pingan Sun: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Ying Miao: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Fajia Chen: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Cheng Zhang: Key Laboratory of Karst Dynamics, Ministry of Natural Resources & Guangxi, International Research Center on Karst under the Auspices of UNESCO, National Center for International Research on Karst Dynamic System and Global Change, Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China

Land, 2024, vol. 13, issue 7, 1-19

Abstract: Land use in karst areas affects soil properties, impacting carbon sinks. Accurate estimation of carbon sink flux in karst areas through zoning and classification is crucial for understanding global carbon cycling and climate change. The peak cluster depression is the largest continuous karst landform region in southern China, with the depressions primarily covered by farmland and influenced by agricultural activities. This study focused on the Guancun Underground River Basin, a typical peak cluster depression basin, where sampling and analysis were conducted during the agricultural period of 2021–2022. Using hydrochemical analysis and isotopic methods, the results indicated that: (1) The primary hydrochemical type in the Guancun Underground River Basin is HCO 3 -Ca, with hydrochemical composition mainly controlled by carbonate rock weathering. (2) The primary sources of Cl − , SO 4 2− , and NO 3 − are agricultural activities, with agriculture contributing 0.68 mmol/L to dissolved inorganic carbon (DIC), accounting for about 13.86%, as confirmed by ion concentration analysis and isotope verification. (3) The size of the depression area is proportional to the contribution of agricultural activities to DIC, while also being influenced by dilution effects. A comparison was made regarding the contribution of other land use types to DIC. The impact of land use on DIC in karst processes should not be overlooked, and zoning and classification assessments of carbon sink flux under different influencing factors contribute to carbon peaking and carbon neutrality goals.

Keywords: peak cluster depression; agricultural activities; karst basin; land use; dissolved inorganic carbon (search for similar items in EconPapers)
JEL-codes: Q15 Q2 Q24 Q28 Q5 R14 R52 (search for similar items in EconPapers)
Date: 2024
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