The pot-culture method combined with chemical and statistical analyses was used to get basic data for determination of the food-security indexes related to combined pollution of Cr and phenol in soil-rice systems.Regr...The pot-culture method combined with chemical and statistical analyses was used to get basic data for determination of the food-security indexes related to combined pollution of Cr and phenol in soil-rice systems.Regression analyses according to the experimental result indicated that the critical concentrations of Cr andphenol in brown rice were 0.37 and 0.33 mg kg-1, respectively, under the condition of Cr-phenol combined pollution.展开更多
Due to the mining,smelting,sewage irriga-tion,agricultural runoff,and development ofrural enterprises,combined pollution of Cd andZn in soil-rice systems has frequently oc-curred.This problem was studied by using thep...Due to the mining,smelting,sewage irriga-tion,agricultural runoff,and development ofrural enterprises,combined pollution of Cd andZn in soil-rice systems has frequently oc-curred.This problem was studied by using thepot-culture imitative method combined withhemical analysis and mathematical models.展开更多
●Soil pH drives trace element mobility and bioavailability.●Bacterial β-diversity enhances trace element accumulation via functional diversity.●Uncultured bacterial ASVs are key in trace element cycling and plant ...●Soil pH drives trace element mobility and bioavailability.●Bacterial β-diversity enhances trace element accumulation via functional diversity.●Uncultured bacterial ASVs are key in trace element cycling and plant interactions.●Networks analysis showsPseudonocardia-Fe/As andBlastopirellula-Al regulatory nodes.Rice,feeding billions,accumulates both toxic trace elements(Cd,As,Al)and essential micronutrients(Se,Cu,Zn,Mn,Fe),posing food safety challenges.This study explores the interactions among soil properties,bacterial communities,and trace element dynamics across China's major paddy soil types.Our analysis showed that strongly acidic soils(pH≤5.5)had higher total As,Al,and Se,while neutral soils(6.5<pH≤7.5)exhibited greater Cd and Mn bioavailability.Bacterial diversity(alpha and beta)significantly influenced trace element accumulation in rice.Bacterial diversity,soil nutrients,and pH explained a large part of the variance in trace element content in soil(total:35.24%,21.69%,and 13.02%;bioavailable:23.68%,29.63%,and 11.81%)and rice grains(23.09%,10.25%,and 17.42%).Co-occurrence networks identified keystone bacterial ASVs,predominantly uncultured lineages(64%),strongly correlated with specific ASVs(R^(2)=0.53-0.80,P<0.001).Structural Equation Modeling revealed soil type,pH,and nutrients collectively explained 32%of bacterial alpha diversity and 75%of community composition variation,driving subsequent trace element distribution in soil and rice.Our findings underscore complex soil-microbe-element interactions,emphasizing managing soil pH and bacterial diversity to optimize rice nutrition of essential elements and mitigate risks from toxic elements.展开更多
Antimony(Sb)contamination in paddy fields can lead to its accumulation in rice grains,posing a threat to food safety.To address this issue,the combined use of zero-valent iron(ZVI)and biochar(BC)were applied to decrea...Antimony(Sb)contamination in paddy fields can lead to its accumulation in rice grains,posing a threat to food safety.To address this issue,the combined use of zero-valent iron(ZVI)and biochar(BC)were applied to decrease the uptake of Sb in Sb-polluted soils,and their effects on Sb uptake from soil to rice grains were investigated.Our results showed that the combination treatment of 0.05%ZVI and 0.095%BC resulted in a significant decrease(42.8%)in Sb accumulation in rice grains that was comparably more efficient than that by 0.05%ZVI(decrease of 15.8%Sb accumulation)or 0.095%BC(decrease of 12.7%Sb accumulation)alone,demonstrating the synergistic effect of ZVI and BC on mitigating Sb uptake by rice plants.ZVI presence resulted in the formation of iron oxides in the soil and on root surfaces,and the S^(2-)/S_(2)^(2-)ascent also increased by 58.7%on day 75 compared with that of the control,facilitating the reduction of Sb(Ⅴ)to less mobile Sb(Ⅲ),thereby decreasing Sb accumulation in rice plants.BC initially increased themobility of Sb owing to its alkaline nature,whereas the electron shuttle properties of BC contributed to a decrease in Sbmobility.The abundance of the arsenite-reducing gene arrA ultimately increased by 203.2% on day 120 compared with the initial phase on day 5,and BC caused a remarkable increase in arrA gene abundance.This study revealed the synergistic mechanisms by combining ZVI and BC to mitigate Sb uptake by rice,which may be useful for the sustainable remediation of contaminated rice paddies.展开更多
文摘The pot-culture method combined with chemical and statistical analyses was used to get basic data for determination of the food-security indexes related to combined pollution of Cr and phenol in soil-rice systems.Regression analyses according to the experimental result indicated that the critical concentrations of Cr andphenol in brown rice were 0.37 and 0.33 mg kg-1, respectively, under the condition of Cr-phenol combined pollution.
文摘Due to the mining,smelting,sewage irriga-tion,agricultural runoff,and development ofrural enterprises,combined pollution of Cd andZn in soil-rice systems has frequently oc-curred.This problem was studied by using thepot-culture imitative method combined withhemical analysis and mathematical models.
基金supported by the Major Program of the Natural Science Foundation of China(Grant Nos.22494680,22494682).
文摘●Soil pH drives trace element mobility and bioavailability.●Bacterial β-diversity enhances trace element accumulation via functional diversity.●Uncultured bacterial ASVs are key in trace element cycling and plant interactions.●Networks analysis showsPseudonocardia-Fe/As andBlastopirellula-Al regulatory nodes.Rice,feeding billions,accumulates both toxic trace elements(Cd,As,Al)and essential micronutrients(Se,Cu,Zn,Mn,Fe),posing food safety challenges.This study explores the interactions among soil properties,bacterial communities,and trace element dynamics across China's major paddy soil types.Our analysis showed that strongly acidic soils(pH≤5.5)had higher total As,Al,and Se,while neutral soils(6.5<pH≤7.5)exhibited greater Cd and Mn bioavailability.Bacterial diversity(alpha and beta)significantly influenced trace element accumulation in rice.Bacterial diversity,soil nutrients,and pH explained a large part of the variance in trace element content in soil(total:35.24%,21.69%,and 13.02%;bioavailable:23.68%,29.63%,and 11.81%)and rice grains(23.09%,10.25%,and 17.42%).Co-occurrence networks identified keystone bacterial ASVs,predominantly uncultured lineages(64%),strongly correlated with specific ASVs(R^(2)=0.53-0.80,P<0.001).Structural Equation Modeling revealed soil type,pH,and nutrients collectively explained 32%of bacterial alpha diversity and 75%of community composition variation,driving subsequent trace element distribution in soil and rice.Our findings underscore complex soil-microbe-element interactions,emphasizing managing soil pH and bacterial diversity to optimize rice nutrition of essential elements and mitigate risks from toxic elements.
基金financially supported by the National Natural Science Foundation of China(Nos.42030702,42307014,and 42077354)the Guangdong Foundation for Program of Science and Technology Research(No.2020B1212060048)+7 种基金the China Postdoctoral Science Foundation(No.2022M720847)the GDAS’Project of Science and Technology Development(Nos.2023GDASZH-2023010103,and 2020GDASYL-20200104017)the open competition program of top ten critical priorities of Agricultural Science and Technology Innovation for the 14th Five-Year Plan of Guangdong Province(No.2022SDZG08)Research Project of Hunan Provincial Department of Education(No.21C0788)National Key Technology R&D Program of China(No.2022YFD1700804)Guangdong Province Key Field R&D Project(No.2023B0202010027)Guangzhou Science and Technology Plan Project(No.2023B03J1286)the research platformwas also supported by Guangdong Science and Technology Infrastructure development(No.2019B121201004).
文摘Antimony(Sb)contamination in paddy fields can lead to its accumulation in rice grains,posing a threat to food safety.To address this issue,the combined use of zero-valent iron(ZVI)and biochar(BC)were applied to decrease the uptake of Sb in Sb-polluted soils,and their effects on Sb uptake from soil to rice grains were investigated.Our results showed that the combination treatment of 0.05%ZVI and 0.095%BC resulted in a significant decrease(42.8%)in Sb accumulation in rice grains that was comparably more efficient than that by 0.05%ZVI(decrease of 15.8%Sb accumulation)or 0.095%BC(decrease of 12.7%Sb accumulation)alone,demonstrating the synergistic effect of ZVI and BC on mitigating Sb uptake by rice plants.ZVI presence resulted in the formation of iron oxides in the soil and on root surfaces,and the S^(2-)/S_(2)^(2-)ascent also increased by 58.7%on day 75 compared with that of the control,facilitating the reduction of Sb(Ⅴ)to less mobile Sb(Ⅲ),thereby decreasing Sb accumulation in rice plants.BC initially increased themobility of Sb owing to its alkaline nature,whereas the electron shuttle properties of BC contributed to a decrease in Sbmobility.The abundance of the arsenite-reducing gene arrA ultimately increased by 203.2% on day 120 compared with the initial phase on day 5,and BC caused a remarkable increase in arrA gene abundance.This study revealed the synergistic mechanisms by combining ZVI and BC to mitigate Sb uptake by rice,which may be useful for the sustainable remediation of contaminated rice paddies.
