长期施用有机和无机肥料对黄潮土有机质含量及组成的影响

淮北黄潮土 19年定位试验结果表明 :长期不施肥土壤的有机质含量与试验前相比下降 1.5 4g/kg ;长期单施化肥可基本维持土壤有机质水平 ;长期施厩肥可显著提高土壤有机质含量 ,比试验前增加 9.2 4～ 10 .6 1g/kg。与无肥处理相比 ,施氮磷钾肥和施厩肥处理土壤有机质的氧化稳定性有所下降 ,而施氮肥和施氮磷肥处理土壤有机质的氧化稳定性升高 ;厩肥配施化肥能明显增加易氧化有机质的含量 ,并降低土壤有机质的氧化稳定性。与定位 5年试验相比 ,长期施厩肥有提高土壤腐殖质含量和胡敏酸 /富里酸比值的趋势 ,而长期不施肥或单施化肥则不利于土壤腐殖质品质改善

ORGANIC AND INORGANIC FERTILIZERS AFFECTING THE CONTENT AND COMPOSITION OF SOIL ORGANIC MATTER--A REPORT OF LONG TERM EXPERIMENT

The results of located experiment on Yellow fluvo aguic soil for 19 years showed that the content of soil organic matter decreased by 1.54 g/kg under no fertilization; Application of chemical fertilizer could maintain the level of soil organic matter; Applying organic materials (yard manure) could increase organic matter by 9.24~ 10.61 g/kg. Compared with CK, N, P, K and manure treatments reduced slightly the oxidation stability of soil organic matter, the opposite was true to the treatments of N and N, P. Under the combined application of manure and chemical fertilizers, organics increased, and the oxidation stability of soil organic matter decreased obviously. Compared with 5 year after start of experiment, the soil humus and humic acid/fulvic acid increased obviously under organic manure application after 19 years. Without fertilization or only chimical fertilizer could not improve the quatity of soil humus.