| Cite this article: | 周靖,栾雅珺,王流通,等.不同水肥管理稻田土壤铬生物有效性及吸收富集特征[J].灌溉排水学报,2022,():-. |
| Zhou Jing,Luan Yajun,Wang Liutong,et al.不同水肥管理稻田土壤铬生物有效性及吸收富集特征[J].灌溉排水学报,2022,():-. |
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| Characteristics of Chromium Bioavailability and Absorption and Enrichment in Paddy Soils under Different Water and Fertilizer Management |
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Zhou Jing,Luan Yajun,Wang Liutong,et al
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1.College of Agricultural science and Engineering, Hohai University;2.State Key Laboratory of Hydrology-Water Resources and Hydraulic Engineering, Hohai University;3.Taihu Basin Authority of Ministry of Water Resources
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| Abstract: |
| 【Background】 In recent years, sewage irrigation and extensive use of chemical fertilizers have aggravated the heavy metal pollution of farmland soil in our country, and food safety production is facing challenges. 【Objective】Explore the effects of different water and fertilizer management on soil chromium bioavailability and differences in rice absorption and enrichment. 【Method】sampling and analysis were carried out in paddy fields where different water and fertilizer management had been implemented for 8 consecutive years. Irrigation used two irrigation management modes: conventional irrigation (F) and controlled irrigation (C), and two fertilization management modes, conventional chemical fertilizer (F) and organic fertilizer (OF), were used for fertilization. And analyzed the differences in soil pH, soil chromium content and form distribution, rice root system and rice chromium content in different water and fertilizer management paddy fields.【Result】 ①Compared with conventional irrigation and conventional fertilizer, both controlled irrigation and organic fertilizer treatment significantly reduced soil pH. ②Compared with conventional water and fertilizer management rice fields (FF), controlled irrigation and organic fertilizer combined management rice fields (COF) increased the content and proportion of soil exchangeable, reducible and oxidizable chromium, and the content of each form increased by 54.33%, 43.06%, and 39.34%; reduced the content and proportion of residual chromium, and reduced the residual chromium content by 2.84%; increased the chromium content in the roots and rice of rice plants, which increased by 46.31% and 59.36% respectively compared with conventional water and fertilizer treatments (FF). ③Under the same irrigation conditions, there was a significant negative correlation between soil pH and exchangeable and reducible chromium content between different fertilization treatments; while under the same fertilization conditions, there is no correlation between soil pH and exchangeable and reducible chromium content among different irrigation treatments. 【Conclusion】Compared with conventional fertilizers, the application of organic fertilizers brought exogenous heavy metal chromium to water-saving irrigation rice fields, and significantly enhanced the bioavailability of soil chromium, and promoted the absorption and enrichment of chromium by rice plants, and threatened the safe production of rice. Compared with conventional irrigation, controlled irrigation had little effect on soil chromium bioavailability. |
| Key words: Water-saving irrigation; Organic fertilizer; Rice field; Chromium; Bioavailability |
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