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Long-Term Manure Amendments Enhance Soil Aggregation and Carbon Saturation of Stable Pools in North China Plain
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2014
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Hierarchical Saturation BehaviorEngineeringLand UseAgricultural EconomicsSoil ManagementLand ApplicationLand DegradationManure ManagementSustainable AgriculturePublic HealthSoil FertilityStable PoolsCarbon SequestrationBiogeochemistryCarbon SaturationSmall MacroaggregatesSoil Carbon CycleEnvironmental EngineeringRepeated Manure AmendmentsFarming SystemsSoil Carbon SequestrationNorth China PlainNutrient Management
250 μm) was the fraction in which SOC continued to increase with increasing manure application rate. In contrast, the chemical and physical protected C pools(i.e., micro-aggregates and silt-clay occluded in the small macroaggregates) exhibited no additional C sequestration when the manure application rate was increased. It can be concluded that repeated manure amendments can increase soil macro-aggregation and lead to the increase in relatively stable C pools, showing hierarchical saturation behavior in the intensive cropping system of North China Plain.