摘要
在水稻土泥浆中添加Fe(OH) 3 可显著降低乙酸浓度 .在新鲜水稻土样品中 ,由于添加Fe(OH) 3导致对乙酸的竞争消耗 ,在培养 5d后 ,乙酸浓度降至 10～ 2 0 μmol·L-1的稳态浓度 ,而此刻对照中的乙酸浓度仍在 12 0 0 μmol·L-1以上 .在乙酸产生量较低的土壤中 ,添加Fe(OH) 3 可完全消耗体系中的乙酸 ,并导致产CH4过程的完全被抑制 .添加纤铁矿同样可使乙酸浓度显著减少 ,但作用效果不如无定形氧化铁 .添加赤铁矿可造成培养初期 (10d以内 )乙酸的大量积累 ,但并不引起产CH4量的增大 .添加Fe(OH) 3 、纤铁矿及铝取代针铁矿 ,能引起厌氧培养的水稻土中丙酸浓度的降低 ,其抑制效率为Fe(OH) 3 >纤铁矿 >铝取代针铁矿 .新鲜土样和经过 11周厌氧处理后的土样中 ,有机酸种类和含量有较大差别 .
The addition of ferrihydrite into paddy slurries significantly reduced the concentration of acetate. In fresh paddy soil, due to the competitive consumption for acetate by addition of ferrihydrite, the concentration of acetate was reduced to 10～20μmol·L -1 after 5d anaerobic incubation. However,in control slurries, the acetate concentration was still as high as more than 1200μmol·L -1 . In soil produced low acetate, the acetate was completely consumed by addition of ferrihydrite, resulting in a full inhibition of methane formation. Also, the application of lepidocrocite reduced methane genesis, but the reductive effect was less than ferrihydrite. The acetate was largely accumulated during a shot term anaerobic incubation from 1 to 10 days by hematite addition, but at the same time, the methane genesis was not extensively increased. The propionate concentration was also reduced under anaerobic incubation by addition of different iron oxides such as ferrihydrite, lepidocrocite and aluminum substituted goethite,and the inhibitory effect was in order of ferrihydrite>lepidocrocite>Al substituted goethite.The types and contents of organic acids in fresh soil were greatly different from those being incubated for 11 weeks under an anaerobic condition.
出处
《应用生态学报》
CAS
CSCD
2002年第11期1425-1428,共4页
Chinese Journal of Applied Ecology
基金
教育部国家留学基金访问学者项目
国家自然科学基金资助项目(4 0 14 10 0 5 ) .
