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Open AccessArticle

Effects of Plum Plantation Ages on Soil Organic Carbon Mineralization in the Karst Rocky Desertification Ecosystem of Southwest China

by Hui Yang 1,2, Biqin Mo 1,2, Mengxia Zhou 1,2, Tongbin Zhu 1,2,* and Jianhua Cao 1,2
1
Karst Dynamics Laboratory, Institute of Karst Geology (CAGS), Ministry of Natural Resources (MNR) and Guangxi, Guilin 541004, China
2
International Research Centre on Karst, Under the Auspices of United Nations Educational, Scientific and Cultural Organization (UNESCO), Guilin 541004, China
*
Author to whom correspondence should be addressed.
Forests 2019, 10(12), 1107; https://doi.org/10.3390/f10121107
Received: 30 October 2019 / Revised: 29 November 2019 / Accepted: 2 December 2019 / Published: 4 December 2019
Soil organic carbon (SOC) mineralization is closely related to carbon source or sink of terrestrial ecosystem. Understanding SOC mineralization under plum plantation is essential for improving our understanding of SOC responses to land-use change in karst rocky desertification ecosystem. In this study, 2-year, 5-year, and 20-year plum plantations and adjacent abandoned land dominated by herbs were sampled, and a 90-day incubation experiment was conducted to investigate the effect of plum plantations with different ages on SOC mineralization in subtropical China. Results showed that: (1) Plum plantation significantly decreased SOC content compared with abandoned land, but there was no significant difference in SOC content among plum plantations with different ages. Oppositely, the accumulative SOC mineralization (Ct) and potential SOC mineralization (C0) showed different responses to plum plantation ages. (2) The dynamics of the SOC mineralization were a good fit to a first-order kinetic model. Both C0 and Ct in calcareous soil of this study was several- to 10-folds lower than other soils in non-karst regions, indicating that SOC in karst regions has higher stability. (3) Correlation analysis revealed that both Ct and C0 was significantly correlated with soil calcium (Ca), suggesting an important role of Ca in SOC mineralization in karst rocky desertification areas. In conclusion, a Ca-rich geological background controls SOC mineralization in karst rocky desertification areas. View Full-Text
Keywords: calcareous soil; plum plantation ages; organic carbon mineralization; fitting parameters; organic carbon accumulation calcareous soil; plum plantation ages; organic carbon mineralization; fitting parameters; organic carbon accumulation
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Yang, H.; Mo, B.; Zhou, M.; Zhu, T.; Cao, J. Effects of Plum Plantation Ages on Soil Organic Carbon Mineralization in the Karst Rocky Desertification Ecosystem of Southwest China. Forests 2019, 10, 1107.

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