不同用量厨余垃圾堆肥对土壤理化性质的影响

通过微区试验研究不同用量(0、45、180、360、540m~3/hm~2)厨余垃圾堆肥对土壤理化性质的影响。结果表明,厨余垃圾堆肥对土壤的影响主要集中在表土层,厨余垃圾堆肥改变了土壤的物理性质,显著增加了土壤养分含量(P0.05),对土壤的pH值和EC值无显著影响(P0.05)。当施用量大于45m~3/hm~2,土壤的田间持水量显著增加(P0.05)。当施用量大于180m~3/hm~2,土壤的干密度显著降低(P0.05)。当施用量大于180m~3/hm~2时,土壤中的硝态氮显著增加(P0.05)。当施用量大于360m~3/hm~2时,土壤中的有机质和有效磷显著增加(P0.05)。当施用量为540m~3/hm~2时,土壤中的硝态氮、有效磷均小于环境风险临界值。

Effect of Different Amount of Kitchen Waste on Physical and Chemical Properties of Soil

The effects of applying different amounts (0,5,180,0 and 540 m³/hm²)of kitchen waste compost (KW)on the physicochemical property of soil were evaluated through micro-region experiment.The result showed that the effects were mainly concentrated in the horizon layer.The KW changed the physical property and increase the nutrient composition of soil (P<0.05),but it had no effects on the pH value and EC value of the soil (P>0.05).When KW was over 45 m³/hm²,the field moisture capacity was significantly increased (P<0.05).When KW was over 180 m³/hm²,the dry density of soil was significantly decreased (P<0.05).When KW was more than 180 m³/hm²,the nitrate nitrogen was significantly increased which was positively correlated with the amount of KW (P<0.05).When KW was over 360 m³/hm² the soil organic matter and available P increased significantly (P<0.05),but the change was not significant in subsoil and bottom layers.The nitrate nitrogen and the available P were lower than the critical value of environmental risk when the applied KW was less than 540 m³/hm².