粪便污泥水热炭对土壤磷素淋失的影响

Effects of Hydrothermal Carbon from Fecal Sludge on Soil Phosphorus Leaching

为探究粪便污泥(FS)及其水热炭(HC)对土壤磷素淋失的影响,文章通过室内土柱淋溶模拟试验,采用连续分级提取法,分析了不同比例(2%、4%和8%)的FS和HC添加到土壤后,土壤磷素的淋失形态及其含量。结果表明,不同处理条件下,土柱淋溶液中无机磷占总磷的比例为72.03%~90.65%,土壤磷素淋失的主要形态是H2O-IP和NaHCO3-IP;添加2%、4%和8%的FS和HC到土壤中后,各处理的总磷淋失量分别为对照组的1.42、1.59、1.99倍和3.57、4.54、7.67倍,土柱磷素淋失量随着粪便污泥及其水热炭添加比例的增加而增大;与在土壤中直接添加粪便污泥相比,添加相同比例的粪便污泥水热炭,减少了土壤60.22%~74.05%的TP淋失,并促进了不稳定形态磷向更稳定形态磷的转化,增大了土壤磷素的可利用潜力。

In order to investigate the effects of fecal sludge(FS)and hydrothermal carbon(HC)on phosphorus leaching in soil,the leaching forms and contents of phosphorus in soil with different proportion(2%,4%and 8%)of FS and HC added to soil were analyzed by successive fractional extraction method through indoor soil column leaching simulation test.The results showed that the proportion of inorganic phosphorus to total phosphorus in soil column leaching solution was 72.03%~90.65%under different treatment conditions,and the main forms of phosphorus leaching were H2O-IP和NaHCO3-IP.After adding 2%,4%and 8%FS and HC to the soil,the total phosphorus leaching loss of each treatment was 1.42,1.59,1.99 and 3.57,4.54 and 7.67 times of the control group(CK),respectively.The amount of phosphorus leaching from soil column increases with the increase of the proportion of fecal sludge and hydrothermal carbon.Compared with the direct addition of FS in the soil,the addition of the same proportion of HC in the soil reduced the TP leaching by 60.22%~74.05%,promoted the transformation of unstable forms of phosphorus to more stable forms of phosphorus,and increased the available potential of soil phosphorus.