长期定位施肥对土壤腐殖质含量的影响

以潮土、旱地红壤和红壤性水稻土为研究对象 ,探讨了长期施肥对土壤腐殖质含量的影响。结果表明 ,长期施用 NPK化肥、有机肥或有机无机肥配施均能提高潮土、旱地红壤和红壤性水稻土耕层的有机质、腐殖质和活性腐殖质含量 ,其中胡敏酸、富里酸也相应地增加 ,但以有机无机肥配施的效果最好。施有机肥或有机无机肥配施还能提高土壤腐殖质的胡 /富比值。施肥对土壤有机质的影响不仅局限于土壤耕层 (0～ 2 0 m) ,而且影响耕层以下层次 ,但以 0～ 6 0 cm土层的效果显著 ,且以潮土的效果明显

Effects of Long-term Located Fertilization on Contents of Soil Humus

The effects of long term located fertilization on content of soil humus in fluvo aquic soil, arid red soil and paddy red soil were studied. The results showed that the content of organic matter, humus, and active humus increased and the level of humic acid and fulvic acid increased correspondingly in the topsoil of fluvo aquic soil, arid red soil and paddy red soil, with long term application of inorganic fertilizer (NPK), organic manure and combined application of both, with the latter being the most .In addition , application of organic manure and combined application of inorganic fertilizer and organic manure could increase the ratio of humic acid to fulvic acid. The effect of long term located fertilization on organic matter was included not only the topsoil (0~20cm), but also the depth of 20~100cm, and most significant in the depth of 0~60cm, and in fluvo aquic soil.