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研究了长期不同施肥处理(化肥与秸秆配施、化肥与猪粪配施、单施化肥和不施肥)下太湖地区黄泥土耕层水稳性团聚体颗粒态有机碳含量的变化。结果表明,供试土壤水稳性团聚体组成以>2mm和2~0.25mm粒径为主,施肥下>2mm水稳性团聚体显著增加,并伴随2~0.25mm水稳性团聚体明显减少。颗粒态有机碳主要存在于>2mm水稳性大团聚体中,并随着水稳性团聚体粒径的减小而明显减少。>2mm水稳性大团聚体中的POC对施肥的响应较为敏感,以化肥与秸秆配施下该粒径水稳性团聚体中POC的积累效果最为明显。而化肥与猪粪配施则显著增加了2~0.25mm和0.25~0.053mm水稳性团聚体中的POC含量。土壤不同层次水稳性团聚体中POC的来源不同,在0~5 cm表层可能主要来源于作物根茬生物量,而在5~15 cm土层则可能跟施入的外源有机物有关。
The changes of particulate organic carbon (SOC) content in water-stable aggregates of yellow paddy soil under long-term different fertilization treatments (fertilizers and straw incorporation, fertilizer and pig manure application, chemical fertilization and no manure application) The results showed that the aggregates of water stable aggregates were mainly> 2mm and diameter of 2 ~ 0.25mm, soil aggregates> 2mm under fertilization significantly increased, accompanied by 2 ~ 0.25mm water stable aggregates decreased significantly . Particulate organic carbon is mainly present in> 2 mm water-stable macroaggregates and decreases significantly with decreasing particle size of water-stable aggregates. The POC of> 2mm water-stable macromolecules was more sensitive to the fertilization response. The accumulation of POC in the water-stable aggregates with fertilizers and straw was the most obvious. Fertilizer and pig manure application significantly increased the POC content in 2 ~ 0.25mm and 0.25 ~ 0.053mm water-stable aggregates. The sources of POC in water-stable aggregates at different soil layers are different from 0 to 5 cm in surface soil layer, but may be related to the exogenous organic matter in 5 ~ 15 cm soil layer.