The Influence of Aggregate Stability and Characteristics of SOC Functional Groups in Anthropogenic-alluvial Soil Under Different Land Use Patterns
For better analysis the effect of farmland soil structure and the organic carbon chemistry properties on different land use patterns,anthropogenic-alluvial soil aggregate distribution and PAD was studied in upland and paddy using the dry and wet sieving.Furthermore,the composition and changes of soil organic carbon(SOC) functional groups in soil aggregate under different land use patterns was studied by X-ray Absorption Near Edge Structure(XANES).The results showed that there were mainly large size(＞5 mm)aggregate in upland and content was 48.19％ more than paddy(38.16％),while the paddy's micro-aggregate content(32.94％) was greater than the upland(13.51％); large size aggregate destruction rate(＞1 mm)of upland was less than that of paddy,on the contrary,small size aggregate(1～0.25 mm) destruction rate was higher than paddy.The relative percentage of stabilized SOC functional groups(fragrance-C and O-alkyl-C)were reduced with aggregate particle size decreasing in upland and paddy,while the relative percentage of active SOC functional groups(carboxyl-C) was increased,and the changes of SOC functional groups were mainly embodied in ＞1 mm aggregate; the relative percentage of active SOC functional groups(carboxyl-C)in upland was higher than paddy; the stabilized SOC functional groups(fragrance-C and O-alkyl-C),however,less than paddy.Since the stabilized SOC functional groups was more advantage to be accumulated in paddy than upland,the stability of soil organic carbon and total organic carbon content was improved in paddy.
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