生物质炭的加入对土壤吸附菲能力以及玉米幼苗对菲吸收量的影响

通过等温吸附试验以及玉米幼苗的盆栽试验,研究了加入生物质炭对土壤吸附菲的性能以及玉米幼苗对土壤中菲的吸收量的影响。结果表明,生物质炭的加入使土壤对菲的吸附能力显著增强：不加炭〈炭A〈炭B〈炭C,相应的分配系数Kd值分别为0.16、0.31、0.34 L.g-1和0.42 L.g-1;生物质炭的加入能有效地减少玉米幼苗对土壤中菲的吸收,通过玉米幼苗栽培试验可以看出,加入生物质炭A、炭B和炭C后,玉米幼苗对土壤中菲的吸收量都有明显的下降。

The Influence of Bio-char Inputting on the Adsorption of Phenanthrene by Soils and by Maize Seedlings

Biomass（the straw） burning adds some organic matter（biochars） into soils,which may affect the physicochemical properties and composition structure of soils.That will change environmental behavior of pollutants in soils.We used isothermal adsorption experiments and the pot experiments to study the influence of biochars（BCs） prepared by rice straw burning on the adsorption of phenanthrene by soils and by maize seedlings.The results showed that BCs inputting remarkably enhanced the adsorption of phenanthrene and obeyed the following subsequence：CKBCsABCsBBCsC.Their Kd-values are 0.16,0.31,0.34 L·g-1 and 0.42 L·g-1,respectively.Meanwhile,BCs could effectively reduce the absorption of phenanthrene by maize seedlings.And we could find that the absorptive amount of phenanthrene in maize seedlings were all reduced obviously when BCsA,BCsB and BCsC added into soils during pot experiments.Absorptive amount of phenanthrene in maize seedlings amended with BCsA,BCsB and BCsC were reduced by 15.44%,18.68% and 25.28%,respectively when phenanthrene concentration was 20 mg·kg-1 in soil,while reduced by 11.97%,21.28% and 38.10%,respectively when phenanthrene concentration was 50 mg·kg-1.This might be due to the enhancement of pollutants fixed in soils amended with BCs and the change of soil properties caused by BCs.