猪粪不同施加年限对水稻土磷积累的影响

通过对不同施粪肥年限（0 a，5 a，10 a）水稻土不同深度磷元素含量的测定和比较，阐明猪粪肥施加影响下水稻土中磷的积累与流失特征。结果表明，磷素是易在土壤中积累的，主要积累于0~40 cm的土体上部，并随着施肥年限的增加，磷逐渐从表层往下层迁移，提高了土壤供磷能力，同时加大了向水体释放磷素的风险。因此，为规避土壤磷元素的流失、缓解农业污染，将5 a作为连续施加粪肥的间隔期是很有必要的。

Influence of different pig manure applying period on phosphorus accumulation in paddy soil

According to the measurement and comparison of phosphorous（P） contents in different depths of the paddy soil applied with different years （0 a， 5 a， 10 a） of spreading manure，the study clarified the characteristics of P accumulation and loss in the paddy soil under the influence of different manure. It was showed that P accumulated in the soil easily， most of which accumulated in the upper part of the 0-40 cm soil and infiltrated from the surface layer migration gradually. P content increased as the increasing of fertilization years. And with the increasing of P content， the capacity of soil phosphorus supply improved while the risk of release P to water increased as well. Therefore， in order to avoid the loss of P element in the soil and to mitigate agricultural pollution， it is necessary to suggest that 5 years should be considered as a continuous interval to apply manure.