长期施肥对黑土养分供应能力和土壤生产力的影响

Influence of Long-term Fertilization on Nutrient Supplying Capacity of Black Soil and Soil Productivity

利用多年国家黑土肥力与肥料效益监测基地资料,探讨长期定位施肥对黑土耕层养分供应和土壤生产力的影响。试验表明,化肥与有机肥配施对土壤生产力的贡献优于相应化肥单施。单施氮肥土壤平均生产力贡献率为68.9%,随着试验年份的延长,单施氮肥对土壤生产力贡献率呈明显下降趋势。氮肥与有机肥配施(M2N)土壤平均生产力贡献率达94%,单施化肥(NPK)处理土壤生产力贡献率较平缓,单施有机肥对土壤生产力贡献率优于单施化肥。多年不合理施肥,N、P、K养分的供应能力逐年降低,尤其以N素最为明显。化肥配施有机肥比单施化肥能更好地提高土壤养分可持续指数。

By means of fertilization experiments,the results showed that the long-term integrated use organic manure with chemical fertilizers was superior to the corresponding applied chemical fertilizer with respect to the contribution to soil productivity.The productivity contribution to N fertilizer was 68.9%,integrated with organic manure was 94%.With treatment of only application of fertilizer NPK,average productivity contribution took on the gentle change,while soil productivity contribution of only application...