猪场废水灌溉对潮土交换性盐基离子含量的影响

通过田间小区试验,研究了猪场废水处理工艺中3个阶段出水（原水、厌氧水和仿生态塘水）与地下水1∶5混水和厌氧水不同灌溉量灌溉对土壤中交换性盐基离子含量的影响。结果表明,厌氧水不同灌溉量对土壤中交换性钾含量影响显著,与对照相比,厌氧水高量灌溉、中量灌溉、低量灌溉分别使0～20cm和20～40cm土层中交换性钾含量提高了291.76%、152.70%、83.11%和116.10%、74.29%、49.85%;对交换性钠、钙、镁含量有一定影响,但处理间未达到显著水平。不同阶段出水混水灌溉对交换性钾、钠、钙、镁的含量处理间未达到显著水平,但土壤中交换性钾和钠含量在0～20cm和20～40cm和处理间呈现了相反的变化趋势,验证了竞争吸附点位理论。

Effects of Swine Wastewater Irrigation on Contents of Exchangeable Cations in Aquatic Soil

Swine wastewater is one of the main wastewater resources of irrigation, but using this water for irrigation directly may be harmful to plants and bring potential risk to environment. To promote the reasonable irrigation strategy of swine wastewater, field experiments were conducted to investigate the effects of different quota of anaerobic wastewater and different treatment stages of swine wastewater irrigation on contents of exchangeable kalium, sodium, calcium, magnesium. The results showed that：（1）the quota of anaerobic wastewater has significant effect on the content of exchangeable kalium, contrasting with control, the content of exchangeable kalium under high-quota irrigation, medium-quota irrigation, low-quota irrigation treatments were enhanced by 291.76%, 152.70%, 83.11% and 116.10%, 74.29%, 49.85% in 0～20 cm and 20～40 cm soil layers, respectively; while the contents of exchangeable sodium, calcium and magnesium were not such significant（;2） the swine wastewater of different treatment stages has little effect on contents of exchangeable kalium, sodium, calcium, magnesium;（3）the contents of exchangeable kalium and sodium in 0～20 cm and 20～40 cm soil layers show opposite tendency, which verify the theory of competitive adsorption of points.