河流故道区不同施肥处理对土壤养分及其酶活性的影响

通过田间肥料试验，探讨不同试验处理对河流故道区不同土层土壤养分及其酶活性的影响。研究结果表明：在提高土壤速效养分时，肥料配比尿素（512.22 kg/hm2）、P2O5（191.11 kg/hm2）、K2SO4（791.53kg/hm2）为最佳处理，其0~20 cm土层中土壤速效磷和速效钾含量分别提高107％和84.6％。全量养分并没有在试验中产生显著性差异。0~20 cm土层中，土壤碱性磷酸酶和过氧化氢酶在尿素（512.22 kg/hm2）、P2O5（191.11 kg/hm2）、K2SO4（263.84 kg/hm2）肥料配比中酶活性表现最高；不同土层中，上层土壤中土壤脲酶和碱性磷酸酶的活性要显著高于下层，但是土壤过氧化氢酶的活性没有显著性差异。

Effect of Different Fertilizer Treatments on Nutrient and Enzymatic Activity of Soil in River Ancient Channel

A field fertilizer experiment was made to explore the effect of different fertilizer treatments on soil nutrients and enzyme activity in different layers of river ancient channel. The results indicated that fertilizer combination of urea (512.22 kg/hm2), P2O5 (191.11 kg/hm2) and K2SO4 (791.53 kg/hm2) was the best treatment for improving nutrients availability in soil. The available phosphorus and available potassium contents of the soil in 0~20 cm depth were increased by 107% and 84.6%, respectively. There was no significant difference in full amount of soil nutrients. The activities of alkaline phosphatase and catalase in fertilizer combination of urea (512.22 kg/hm2), P2O5 (191.11 kg/hm2) and K2SO4 (263.84 kg/hm2) were the highest; the activities of urease and alkaline phosphatase were significantly higher in upper soil layer than in lower soil layer, but the soil catalase activity was not significantly different in different soil layers.