有机肥配施下控制灌溉对水稻镉吸收转运的影响OA

[Objective]Cadmium(Cd)contamination in paddy soils is a serious food safety concern and is influenced by multiple environmental and management factors.This paper investigates the combined effect of irrigation and fertilization on the uptake,translocation,and redistribution of Cd in rice plants,and elucidates the role of key organs and transport processes in Cd accumulation in rice grains.[Method]A long-term field experiment was conducted in a paddy field with moderate Cd contamination.It consisted of two treatments:controlled irrigation combined with organic fertilization,and conventional fertilization combined with continuous flooding irrigation(control).During the experiment,plant growth,Cd uptake,its translocation and redistribution in rice plants,as well as soil properties,were measured.[Result]Compared with the control,controlled irrigation combined with organic fertilization significantly increased soil organic carbon by 35.16%and improved plant growth traitors,including tiller numbers,plant height and dry matter accumulation;it also enhanced Cd enrichment in plant roots and promoted Cd translocation from roots to stem sheaths,leaves,and grains.Consequently,it increased grain Cd concentration and total accumulation by 93.77%and 93.22%,respectively,compared with the control.Grain Cd concentration was positively correlated with translocation factors from stem sheath to grain and from leaf to grain,with the correlation coefficient substantially higher than correlations with other factors.[Conclusion]The long-term experimental results demonstrate that rice roots are the primary organ for Cd uptake and its subsequent transport to aboveground tissues,while the redistribution of Cd in stems,sheaths,and leaves plays a crucial role in its translocation to grains.These findings provide a scientific basis for Cd risk assessment and optimizing water-fertilizer management practices in rice production.