作　　者： ; ; ;

机构地区： 东北农业大学

出　　处： 《水土保持学报》 2008年第2期170-173,190,共5页

摘　　要： 采用培养试验研究了长期施肥对黑土矿化与硝化作用特征的影响。结果表明,黑土的矿化作用和硝化作用都较强,长期施肥对黑土矿质态氮量有显著影响,施用化肥能够增加矿质态氮量,在施用NPK肥基础上增施有机肥,矿质态氮量进一步增加,表明在土壤管理上如果增加有机肥的施用,可以提高土壤的供氮能力。长期施肥黑土的硝化率与施N肥相关性较好,其次是施用PK肥。有机肥与无机肥配施可使土壤硝化率显著提高;硝化率高低取决于黑土可矿化态氮素含量和土壤pH。 The effects of long-term fertilization on nitrogen mineralization and nitrification in black soil were investigated by a 28 d incubation experiment. The main results were as follows, soil nitrogen mineralized and nitrified significantly among different treatments in the duration of incubation, showing that long-term fertilization had pronounced effect on mineralizable nitrogen content. Mineralizable nitrogen content increased with increasing application of chemical fertilizer, however, application of organic manure together with NPK fertilizer further en- hanced nitrogen mineralization, which indicated that organic amendment significantly increased soil nitrogen bioavailability. The nitrification rate had strong relationship with N application, whereas a weak correlation was found between nitrification rate and application of PK fertilizer. Chemical fertilizers amended with organic manure significantly increased nitrification rate, conclusively, changes of nitrification rates were driven by soil pH and the mineralizable nitrogen content of black soil.

关 键 词： 黑土 长期施肥 氮素 矿化作用 硝化作用

领　　域： [农业科学] [农业科学] [农业科学] [农业科学]