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为探讨沼液排放对土壤质量的影响,对比研究了沼气站周边在不同沼液影响频率下的土壤容重、酸碱度和有机质、全氮、全磷、全钾含量。结果表明,受沼液影响的土壤质量发生了变化,其中长期受沼液排放影响的土壤、人工每年灌溉4次沼液的土壤的有机质、全氮、全磷、全钾含量均有一定程度的增加,土壤容重降低,酸碱度变化不大;与海南省砖红壤农田平均水平相比,受沼液排放影响的土壤的有机质、全氮、全钾含量明显增高,全磷含量偏低,说明长期排放沼液已经造成了土壤氮、钾盈余,磷缺乏,养分供给不平衡。
In order to investigate the impact of biogas slurry discharge on soil quality, the bulk density, pH and organic matter, total nitrogen, total phosphorus and total potassium contents of biogas plants around biogas slurry were compared. The results showed that the quality of soil affected by biogas slurry changed. Among them, the content of organic matter, total nitrogen, total phosphorus and total potassium in soils that had been affected by biogas slurry for a long time was Compared with the average level of farmland in brick-red soil in Hainan Province, the content of organic matter, total nitrogen and total potassium in soil affected by biogas slurry discharge increased significantly and the content of total phosphorus was low, indicating that long-term emissions Biogas slurry has caused soil nitrogen and potassium surpluses, phosphorus deficiency and nutrient supply imbalance.