摘要
研究了不同磷水平处理下水稻田面水中磷氮的动态变化情况。结果表明,不同磷水平下田面水中活性磷与总磷的浓度在施肥初期达到最高,施磷量为0、25、60、120及240 kg/hm^2的情况下,田面水中全磷的浓度分别达到了0.16、6.94、19.91、42.67及83.35 mg/L,随后逐渐下降直至相对稳定。在烤田过后,田面水中活性磷与总磷的浓度均有一次明显的回升。不同施磷处理间的田面水中,铵态氮、硝态氮及全氮的浓度没有明显差别。在施基肥初期,田面水中的铵态氮与全氮的浓度达到最高,之后逐渐下降,到第7天时降至最低,在以后的2次追肥中也出现了类似趋势。建议施肥后7-10 d为控制养分流失的最佳时期。
The dynamic characteristics of P and N in surface water of paddy field and its potential environmental impact were studied with different P fertilization rotes.The results showed that the concentration of P in the headmost surface water was the highest among all the samples and it was increasing with the application rates of P fertilizer. The total P concentrations were 0. 16 mg/L, 6.94 mg/L, 19.91 mg/L,42.67 mg/L and 83.35 mg/L when the soil were fertilized with 0 kg/hm^2, 25 kg/hm^2, 60 kg/hm^2, 120 kg/hm^2 and 240 kg/hm^2 respectively. There was no difference in the nitrogen concentrations the P application rates. It was the key period from 7 to 10 days after fertilization.
出处
《安徽农业科学》
CAS
北大核心
2007年第27期8568-8570,共3页
Journal of Anhui Agricultural Sciences
基金
南京信息工程大学校内基金项目(QD36)
江苏省高校自然科学研究计划研究(2535)资助
关键词
磷
氮
田面水
养分流失
水体污染
Phosphorus
Nitrogen
Surface water
Nutrient loss
Water pollution
