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Effects on Distributions of Carbon and Nitrogen in a Reddish Paddy Soil under Long-term Different Fertilization Treatments
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2009
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Unknown Venue
Carbon SequestrationBiogeochemistryEnvironmental ChemistryEngineeringSoil Carbon CycleEnvironmental EngineeringSoil ScienceSeventeen YearCrop ProtectionAgricultural EconomicsBioremediationWet Sieve AggregatesSoil Organic MatterDry Sieve AggregatesSoil ChemistrySoil FertilityReddish Paddy SoilWaste Management
Based on seventeen year positioned experiment research, the results showed dry sieve aggregates (DSA) in plow layer and plow pan of a reddish paddy soil mainly consisted of DSA 5mm,and its proportion in treatments with organic materials application was lower than those without; for wet sieve aggregates (WSA), WSA5mm accounted for the highest proportion in plow layer,and WSA0.25mm did so in plow pan. The organic C and total N contents in WSAs concentrated in 1mm WSAs with the highest value appearing in WSA5-2mm of plow layer, and decreased with decreasing WSA size, with the highest value appearing in WSA5mm in plow layer. The ratio of C/N increased from WSA5mm to WSA2-1mm and decreased since WSA2-1mm in plow layer. However, it indicated a decreasing tread with decreasing WSA size in plow pan. Long-term organic materials returning, especially combined with inorganic fertilizers addition, can significantly improve organic C and total N contents in plow layers,and leave a few impacts on them in plow pan; if chemical fertilizers were applied alone, the effects on organic C and total N contents in plow layer were not obvious.