磷在棕壤中淋溶迁移特征研究

Study about Movement of Phosphate in Brown Soil

采用室内土柱淋溶模拟试验,研究相当于一年降雨条件下磷肥在棕壤土垂直方向上的淋溶迁移特征及鸡粪、秸秆对磷素迁移转化的影响。结果表明:土壤施肥量与速效磷、迟效态磷增加量呈极显著正相关,相关系数分别是0.991 41,0.997 74;水溶性磷、A l-P与土壤速效磷相关性最好,相关系数分别达0.972和0.926。250 0 m g/kg鸡粪与25 m g/kg磷肥配施能降低磷淋溶率,并能极显著提高土壤中速效磷的增加量,相当于单施50 m g/kg的磷肥;秸秆与磷肥配合施用在短期内对土壤磷素的有效性影响不大,但可以减少磷素向下层迁移。

Soil column is used to study the characteristics of the movement of phosphate in uprightness direction in brown soil which is in one year rainfall condition. The result shows that the significant correlation coefficient of fertilization quantity and available P,retainable P is 0. 991 41,0. 997 74;the better correlation coefficient of soluble P,Al-P and available P is 0. 972,0. 926. The 25 mg/kg fertilizer P in combination with 2 500 mg/kg chicken feces can reduce the eluviate rate,and can improve Olsen-P of the soil markedly,be equal to 50 mg/kg fertilizer P singly;the fertilizer P in combination with straw have little influence of available P,but can reduce the movement of phosphorous.