Analysis of Composition Fluorescence Characteristics of SWOC in Different Straw Returning Modes Based on 3DEEM-PARAFAC Method
Three dimensional fluorescence spectroscopy combined with parallel factor method(3DEEM-PARAFAC)was used to analyze the composition of water-soluble organic carbon(WSOC)in soil and the fluorescence characteristics of different soil layers under three tillage methods(no-tillage,shallow tilling,deep tilling)and corresponding tillage methods(straw no-tillage mulding,shallow tilling,deep tilling).The results showed that four fluorescence components were determined by WSOC,namely two humic substances C1(310,240/410 nm)and C2(270/465 nm)and two protein-like substances C3(280,230/340 nm)and C4(220/300 nm).The conversion of humic substances C1 and C2 to protein-like substances C4 in the soil layer>35 cm was promoted.The source of soil WSOC was the mixed contribution of plant and microbial sources,and the humification degree was the lowest in the soil layer>35 cm.Straw returning and deep turning could promote the mineralization and decomposition of organic matter with complex structure and high aromatic properties in deep soil WSOC.
water-soluble organic carbon(WSOC)farming methodsstraw returning to the field3DEEM-PARAFAC
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