Soil organic carbon pools controlled by climate and geochemistry in tropical volcanic regions.

The Science of the Total Environment
Han LyuShinya Funakawa

Abstract

Understanding the factors that control the storage of soil organic carbon (SOC) is an urgent priority for mitigating global climate problems. The objective of this study was to determine the factors controlling SOC pools with differing stabilities. Surface soil samples were collected along an elevation gradient from four volcanic regions of Tanzania (two regions) and Indonesia (two regions) under largely-undisturbed vegetation (24 sites in total). A three-pool kinetic model was fitted to accumulative CO2 release curve produced over 343-day incubation to determine the sizes of the labile and intermediate SOC pools (CL and CI, respectively) and their mean residence times (1/KL and 1/KI, respectively), where the size of the stable SOC pool (CS) was measured as non-hydrolyzable carbon. Correlation and path analyses were performed using the results of soil fractionation and model fitting with climatic and geochemical properties. The intermediate pool comprised 50% of total SOC, was responsible for 58% of total accumulative CO2 release, and controlled total SOC stability. The content of nanocrystalline minerals (Alo + 1/2Feo: 5.5-110 g kg-1) was strongly correlated with CI and CS, suggesting that organo-mineral complexes is the essen...Continue Reading

References

Apr 16, 2016·The Science of the Total Environment·Yusuf Yigini, Panos Panagos
Apr 13, 2017·Environmental Science & Technology·Guanghui YuQirong Shen
Aug 20, 2019·The Science of the Total Environment·Patrick IlligerManfred Frühauf

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