| Cite this article: | 王思宇,孙雪梅,陈末.基于不同灌溉模式的土壤氮素赋存及转化研究[J].灌溉排水学报,0,():-. |
| Wang SIyu,sunxuemei,chenmo.基于不同灌溉模式的土壤氮素赋存及转化研究[J].灌溉排水学报,0,():-. |
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| DOI： |
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| Study on soil nitrogen occurrence and transformation based on different irrigation patterns |
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Wang SIyu1, sunxuemei2, chenmo2
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1.School of hydraulic and electric power, Heilongjiang University Harbin;2.Heilongjiang Academy of Water Resources, Harbin 150080, China
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| Abstract: |
| 【Objective】The objective of this study was to explore the mechanism of different irrigation patterns on soil nitrogen occurrence and transformation in paddy fields and their relationship with rice growth and environmental effects. 【Method】 Based on the comprehensive analysis of the relevant research results, the occurrence of ammonium nitrogen (NH4+-N), nitrate nitrogen (NO3--N) and alkali hydrolyzable nitrogen (AN) at different soil depths at different growth stages was elaborated under three irrigation modes: shallow irrigation (QS), shallow irrigation + 80% soil moisture content (QSG) and deep irrigation + 80% soil moisture content (SSG), and NH4+-N at different soil depths at 1, 3, 5 and 7 days after fertilization. The transformation of NO3--N and AN and the effect of these changes on the formation of rice yield provide a scientific basis for optimizing irrigation management and realizing sustainable rice production. 【Result】 The results showed that the spatiotemporal variation of NH4+-N content in the 0-40 cm soil layer was basically the same at the tillering stage and jointing stage, and the overall spatial variation decreased with the increase of soil depth. The temporal and spatial variation of soil NH4+-N content in the 0-40 cm soil layer was basically stable at the heading stage and maturity stage, and there was no significant difference among the treatments. The time variation of soil NO3--N in different irrigation modes in 0-40 cm soil layer was basically the same in each treatment, and the soil NO3--N content gradually decreased with the progress of rice growth period. There were differences in spatial variation, but the overall NO3--N showed a decreasing trend with the increase of soil depth. There was no obvious pattern in the temporal variation of soil AN under different irrigation patterns, because AN provided a stable source of nitrogen and changed with the decomposition of soil microorganisms. There are differences in the spatial variation of soil layer, and AN decreases with the increase of soil depth. After fertilization, the changes of NH4+-N and NO3--N in the soil showed a law of mutual transformation, while AN reflected the change of the overall nitrogen status of the soil. 【Conclusion】 Reducing the upper limit of irrigation and controlling the lower limit of irrigation can promote nitrogen accumulation, and timely monitoring of various nitrogen forms in soil can help to optimize fertilizer management and improve the sustainability of crop yield. |
| Key words: nitrate nitrogen; ammonium nitrogen; alkaline hydrolyzable nitrogen; Rice irrigation patterns |
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