| 引用本文: | 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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| 不同水肥管理稻田土壤铬生物有效性及吸收富集特征 |
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周靖1, 栾雅珺1,2, 王流通3, 徐俊增4
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1.河海大学农业科学与工程学院;2.河海大学水文水资源与水利工程科学国家重点实验室;3.水利部太湖流域管理局;4.河海大学农业科学与工程学院河海大学水文水资源与水利工程科学国家重点实验室
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| 摘要: |
| 【目的】探究不同水肥管理对土壤铬生物有效性的影响及水稻吸收富集差异。【方法】在连续实施8年不同水肥管理的稻田开展取样分析。灌溉采用常规灌溉(F)、控制灌溉(C)两种灌溉模式,施肥采用常规化肥(F)、有机肥(OF)两种施肥模式。分析不同水肥管理稻田土壤pH、土壤铬含量及形态分布、水稻根系和稻谷铬含量的差异。【结果】①与常规灌溉和常规肥相比,控制灌溉和有机肥处理均显著降低了土壤pH。②与常规水肥管理稻田(FF)相比,控制灌溉和有机肥联合管理稻田(COF)增加了土壤可交换态、可还原态和可氧化态铬含量和占比,各形态含量分别增加了54.33%、43.06%和39.34%；减少了残渣态铬含量和占比,残渣态铬含量减少了2.84%；增加了水稻植株根部和稻谷铬含量,分别较常规水肥处理(FF)增加了46.31%和59.36%。③在相同灌溉条件下,不同施肥处理间土壤pH和可交换态、可还原态铬含量之间呈显著负相关关系；而在相同施肥条件下,不同灌溉处理间土壤pH和可交换态、可还原态铬含量之间不存在相关性。【结论】对比常规肥,施用有机肥给节水灌溉稻田带入了外源重金属铬,并显著增强了土壤铬生物有效性,促进了水稻植株吸收富集铬,威胁水稻安全生产；对比常规灌溉,控制灌溉对土壤铬生物有效性影响不大。 |
| 关键词: 节水灌溉；有机肥；稻田；铬；生物有效性 |
| DOI： |
| 分类号:S27 |
| 基金项目:江苏省科技计划项目(SBE2019310516)。 |
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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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