秸秆改良土壤对磷的淋溶能力及其在不同 团聚体中垂直分布的影响

采用室内土柱模拟法研究了不同处理秸秆改良土壤对磷的淋溶能力及其在不同团聚体中垂直分布的 影响，测定了淋溶液中全磷和水溶性磷以及土柱不同层次土壤中全磷、Fe-P、Al-P、Ca-P、O-P 和水溶性磷的含量。结 果表明院不同处理秸秆改良土壤中全磷淋失曲线呈降低趋势，碳化秸秆处理相比其他处理淋溶液中全磷的含量较 少，对全磷淋溶损失具有较大的抑制作用；T2、T3、T4 处理可溶性磷累计淋溶损失量比T1 处理分别减少59.44%、 30.56%、69.44%，处理与对照间差异极显著；土柱中无机形态磷垂直分布中T2、T3、T4 处理在20~25 cm 处增加值都 低于T1 处理，不同处理秸秆改良土壤阻止了无机形态磷向下层土壤的迁移。

Effects of soil improved by straw on leaching ability of phosphorus and vertical distribution in different soil aggregates

By indoor soil column simulated method, effects of soil improved by straw on leaching ability of phosphorus and vertical distribution in different soil aggregates were studied, the concentrations of total phosphorus and water-soluble phosphorus in leaching solution, and total phosphorus, Fe-P, Al-P, Ca-P, O-P and water-soluble phosphorous in different soil layers were measured. Results showed that, the total phosphorus leaching of soil improved by different straws decreased. Compared to other treatments, the total phosphorus concentration in leaching solution of carbonized corn straw treatment was less, and carbonized corn straw had significant inhibition on phosphorus leaching loss. Compared to T1 treatment, the cumulative leaching loss of water-soluble phosphorus of T2, T3, T4 treatment decreased by 59.44%, 30.56% and 69.44%, respectively, and there was significant difference between CK and treatments. In the layer of 20 ~25 cm, the increasing value of inorganic phosphorus concentration of T2, T3, T4 treatment was less than T1 treatment, indicating that soil improved by different straws prevented the inorganic phosphorous migration into the lower soil layer.