The effect of 34-year continuous fertilization on the SOC physical fractions and its chemical composition in a Vertisol

Scientific Reports
Zichun GuoXinhua Peng

Abstract

Reports regarding the effects of long-term organic and inorganic fertilization on the quantity and quality of soil organic carbon (SOC), particularly in Vertisols, are scarce. In this study, we combined SOC physical fractionation with 13C NMR spectroscopy technology to investigate the effect of 34 years of continuous fertilization on the SOC physical fractions and its chemical composition of 0-20 cm soil layer in a Vertisol. This study consisted of six treatments: no fertilization (control), chemical nitrogen, phosphorus and potassium fertilizers (NPK), low and high amounts of straw with chemical fertilizers (NPKLS and NPKHS), and pig or cattle manure with chemical fertilizers (NPKPM and NPKCM). Over 34 years of continuous fertilization, the SOC sequestration rate was from 0.08 Mg C ha-1 yr-1 in the control treatment to 0.66 Mg C ha-1 yr-1 in the NPKCM treatment, which was linearly related with the C input (P < 0.01). Of the five SOC physical fractions, two silt plus clay fractions (S + C_M, S + C_mM) dominated 74-92% of SOC, while three POM fractions (cPOM fPOM and iPOM) were only 8-26%. The two manure application treatments significantly increased all the SOC physical fractions except for the silt plus clay fraction within ma...Continue Reading

References


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Citations

May 5, 2020·Journal of Environmental Management·Hafiz Mohkum HammadArtemi Cerdà

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Methods Mentioned

BETA
NMR
nuclear magnetic resonance

Software Mentioned

SPSS

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