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采用原状土柱模拟方法,探讨了施肥水平、添加不同碳氮比(C/N)有机物、不同类型土壤、土壤水分含量及温度对含3,4-二甲基吡唑磷酸盐(3,4-dimethyl pyrazole phosphate,DMPP)硝化抑制剂的尿素(DMPP尿素)氨挥发损失的影响。结果表明,施肥水平对DMPP尿素的氨挥发损失有显著影响,随着DMPP尿素施用量的增加,土壤氨挥发损失量呈显著上升的趋势;DMPP尿素配施低C/N比的有机物鸡粪,氨挥发损失增加6.0%;而配施高C/N比的生物秸秆,则表现为可抑制78.2%的氨挥发损失;DMPP尿素的氨挥发损失受土壤理化性质影响很大,在肥力高的碱性土壤中氨挥发损失严重,而在酸性红壤和阳离子交换量高的青紫泥中挥发损失量较低;在土壤含水量为田间饱和持水量时,氨挥发损失表现为急剧增加;随着土壤温度的升高,氨挥发损失的量快速递增。合理控制施肥量、选择配施高C/N比的生物秸秆和适宜的水分管理方式是减少农田氨挥发损失的重要对策。
Using the original soil column simulation method, the effects of fertilization level, C / N ratio, different types of soil, soil moisture content and temperature on the content of 3,4-dimethylpyrazole phosphate (3,4 -dimethyl pyrazole phosphate (DMPP) nitrification inhibitor urea volatilization (DMPP urea). The results showed that the fertilization level had a significant effect on the ammonia volatilization loss of DMPP urea. With the increase of DMPP urea application, the ammonia volatilization loss increased significantly. DMPP urea with low C / N ratio of organic manure, Ammonia volatilization loss increased by 6.0%. However, biological straw with high C / N ratio showed 78.2% loss of ammonia volatilization. Ammonia volatilization loss of DMPP urea was greatly affected by soil physicochemical properties. The loss of ammonia volatilization was serious in the soils, whereas the loss of volatilization in the acid purple soil and the cation exchangeable purple soil was lower. When the soil water content was the saturated soil moisture, the ammonia volatilization loss increased sharply. With the soil temperature The amount of ammonia volatilization increased rapidly. It is an important countermeasure to reduce ammonia volatilization loss in farmland by reasonably controlling the amount of fertilizers and choosing bio-straw with high C / N ratio and suitable water management methods.