农业研究与应用2025，Vol.38Issue(2)：182-191,10.DOI:10.20191/j.cnki.2095-0764.2025.02.009
铁基腐殖质对土壤镉有效性及糙米镉含量的影响
Effects of Iron(Fe)-Based Humus on Cadmium Availability in Soil and Cadmium Content in Brown Rice
摘要
Abstract
[Objective]Cadmium contamination is severe in paddy field of China,and cadmi-um is harmful when transferred to human body after enriched by rice,therefore,it is necessary to develop technology for controlling cadmium pollution in rice.This study aimed to investigate the effects of different application amounts of iron(Fe)-based humus on the cadmium availability in soil and the cadmium content in rice,and to determine the optimal application amount of Fe-based hu-mus in cadmium-contaminated paddy fields.[Method]Four different application levels of Fe-based humus as heavy metal passivator were set in the field experiments:0 kg/hm2(CK),1 500 kg/hm2(F1500),2 250 kg/hm2(F2250),3 000 kg/hm2(F3000).The cadmium content in soil pore water,soil available cadmium and cadmium content in different parts of rice plant at different growth stag-es were analyzed to study the effects of Fe-based humus on cadmium bioavailability in soil and its relationship with cadmium content in brown rice.[Result]Different application amounts of Fe-based humus had little effect on rice yield and pH of soil.Fe-based humus can reduce cadmium con-tent in soil pore water and available cadmium content in soil.The reduction ranges of cadmium con-tent in soil pore water under the treatments F1500,F2250 and F3000 were 7.55%～32.60%,10.68%～58.94%and 21.44%～51.54%,respectively.The reduction ranges of available cadmium content in soil under the treatments F1500,F2250 and F3000 were 3.13%～10.79%,6.30%～15.58%and 7.55%～20.14%,respectively.With the increase of the application amount of Fe-based humus,the cadmium content in soil pore water and available cadmium content in soil showed a downward trend.Com-pared with the CK,the cadmium content in brown rice was significantly reduced by 30.0%,23.8%and 40.4%,respectively,in the treatments F1500,F2250 and F3000.There was no significant differ-ence among the treatments with different application amounts of Fe-based humus.Pearson correla-tion analysis showed that the cadmium content in brown rice was significantly positively correlated with the cadmium content in roots,stems and leaves,soil pore water,and available cadmium con-tent,indicating that the reduction of cadmium content in different parts of rice by Fe-based humus is related to its ability to reduce the cadmium content in soil pore water and available cadmium content in soil.[Conclusion]Fe-based humus can effectively reduce the cadmium content in soil pore water and available cadmium content,and decrease the mobility of cadmium from soil to rice.Differ-ent application amounts can significantly reduce the cadmium content in brown rice.The treatment with 3 000 kg/hm2 showed the best effect in reducing cadmium in brown rice.However,from the perspective of economic efficiency and food safety compliance,it is recommended that the appropri-ate application amount should be 1 500 kg/hm2 for rice commercial production.关键词
铁基腐殖质/有效态镉/孔隙水镉/糙米Key words
Iron(Fe)-based humus/available cadmium/cadmium in soil pore water/brown rice分类
环境科学引用本文复制引用
雷静,王骋臻,方圆,丁氏祝,张海斌,唐翠荣,李慧敏,潘慧..铁基腐殖质对土壤镉有效性及糙米镉含量的影响[J].农业研究与应用,2025,38(2):182-191,10.基金项目
中向旭曜科技有限公司项目(ZXXY-YF-2018-002). （ZXXY-YF-2018-002）
