Influence of Biomass Amendments on Soil CO 2 Concentration and Carbon Emission Flux in a Subtropical Karst Ecosystem

Zeyan Wu (), Weiqun Luo, Zhongcheng Jiang and Zhaoxin Hu
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Zeyan Wu: Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Weiqun Luo: Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Zhongcheng Jiang: Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China
Zhaoxin Hu: Institute of Karst Geology, Chinese Academy of Geological Sciences, Guilin 541004, China

Sustainability, 2024, vol. 16, issue 18, 1-12

Abstract: Soil in karst areas is rare and precious, and karst carbon sinks play an important role in the global carbon cycle. Therefore, the purpose of karst soil improvement is to improve soil productivity and a carbon sink effect. Biomass amendment experiments in this study included three schemes: filter mud (FM), filter mud + straw + biogas slurry (FSB), and filter mud + straw + cow manure (FSC). The characteristics of soil CO 2 production, transport, and the effect on soil respiration carbon emissions in two years were compared and analyzed. The results were as follows: 1. The rate, amount, and depth of CO 2 concentration were affected by the combinations with biogas slurry (easy to leach) or cow manure (difficult to decompose). 2. The diurnal variation curves of soil respiration in the FSB- and FSC-improved soils lagged behind those in the control soil for three hours. While the curves of FM-improved soil and the control soil were nearly the same. 3. Soil–air carbon emissions increased by 35.2 tCO 2 /(km 2 ·a −1 ) under the FM scheme, decreased by 212.9 tCO 2 /(km 2 ·a −1 ) under the FSB scheme, and increased by 279.5 tCO 2 /(km 2 ·a −1 ) under the FSC scheme. The results were related to weather CO 2 accumulation in the deep or surface layers under different schemes.

Keywords: karst soil improvement; soil CO 2; soil respiration; carbon source and sink effect (search for similar items in EconPapers)
JEL-codes: O13 Q Q0 Q2 Q3 Q5 Q56 (search for similar items in EconPapers)
Date: 2024
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