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为避免城市生活污水携带的N、P进入水体,新西兰罗托鲁阿市处理后的污水直接喷灌至Whakarewarewa森林,同时建立污水灌溉林地处理系统长期定位试验地,以评价林地生态系统对污水携带营养物质的同化能力。为了解长期污水灌溉对土壤中P的数量、形态、环境的影响,对该灌溉系统中的土壤进行了剖面采样分析。结果表明:土壤TP(全磷)、Olsen P、M3P(Mehlich-3 P)在所有灌溉区的表层土壤(0～10 cm)均有显著(p<0.05)增加,部分指标的显著增加达深层土壤。随灌溉进入土壤的P大多被保存在上层土壤(0～40 cm)中。土壤中各形态的磷所占比例因长期污水灌溉而改变,灌溉前占优势的NaOH Po(以NaOH浸提得到的有机磷)经长期灌溉后被NaOH Pi(以NaOH浸提得到的无机磷)所取代,上层土壤WSP(水溶性磷,Wa-ter-soluble P)变化明显。以Olsen P 60 mg kg-1和M3P 150 mg kg-1为环境临界值可预测土壤剖面中P的淋失危机,WSP可望成为适用更广的土壤P淋失环境危机预测指标。
In order to prevent N and P from entering city water, the treated sewage in Rotorua, New Zealand, was sprayed directly to the Whakarewarewa forest. At the same time, a long-term experimental site for sewage irrigation forest land treatment system was set up to evaluate the effect of forest ecosystem on the carrying of nutrients Material assimilation ability. In order to understand the effect of long-term sewage irrigation on the quantity, morphology and environment of P in soil, the soil in the irrigation system was sampled and analyzed. The results showed that TP (total phosphorus), Olsen P and M3P (Mehlich-3 P) increased significantly (p <0.05) in the topsoil (0-10 cm) of all irrigated areas, and some indexes increased significantly soil. P entering the soil with irrigation is mostly retained in the upper soil (0-40 cm). The proportions of phosphorus in soil varied with long-term wastewater irrigation. Before long-term irrigation, NaOH Po (organic phosphorus obtained by NaOH leaching) and NaOH Po (inorganic phosphorus obtained by NaOH leaching) Replaced WSP (water-soluble phosphorus, Wa-ter-soluble P) changes in the upper soil significantly. Prediction of leaching loss of P in soil profiles with Olsen P 60 mg kg-1 and M3P 150 mg kg-1 can be predicted by WSP, which is expected to become a more suitable predictor of soil P leaching environmental crisis.