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Arbuscular mycorrhizal fungi regulate plant mineral nutrient uptake and partitioning in iron ore tailings undergoing eco-engineered pedogenesis

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Pedosphere 2024年第2期34卷 385-398页

作者： Zhen LI Songlin WU Yunjia LIU Qing YI merinda HALL Narottam SAHA Junjian WANG Yuanfang HUANG Longbin HUANG College of Land Science and Technology China Agricultural UniversityBeijing 100193China Centre for Mined Land Rehabilitation Sustainable Minerals InstituteThe University of QueenslandBrisbaneQLD 4072Australia Guangdong Provincial Key Laboratory of Soil and Groundwater Pollution Control School of Environmental Science and EngineeringSouthern University of Science and TechnologyShenzhen 518055China

Excess available K and Fe in Fe ore tailings with organic matter amendment and water-deficiencies may restrain plant colonization and growth,which hinders the formation of eco-engineered soil from these tailings for sustainable and cost-effective mine site *** mycorrhizal(AM)fungi are widely demonstrated to assist plant growth under various unfavorable ***,it is still unclear whether AM symbiosis in tailings amended with different types of plant biomass and under different water conditions could overcome the surplus K and Fe stress for plants in Fe ore tailings,and if so,by what ***,host plants(Sorghum *** ***),either colonized or noncolonized by the AM fungi(Glomus spp.),were cultivated in lucerne hay(LH,C:N ratio of 18)-or sugarcane mulch(SM,C:N ratio of 78)-amended Fe ore tailings under well-watered(55%water-holding capacity(WHC)of tailings)or water-deficient(30%WHC of tailings)*** mycorrhizal colonization,plant growth,and mineral elemental uptake and partitioning were *** indicated that AM fungal colonization improved plant growth in tailings amended with plant biomass under water-deficient *** mycorrhizal fungal colonization enhanced plant mineral element uptake,especially P,both in the LH-and SM-amended tailings regardless of water ***,AM symbiosis development restrained the translocation of excess elements(i.e.,K and Fe)from plant roots to shoots,thereby relieving their *** AM fungal roles in P uptake and excess elemental partitioning were greater in LH-amended tailings than in SM-amended *** deficiency weakened AM fungal colonization and functions in terms of mineral element uptake and *** findings highlighted the vital role AM fungi played in regulating plant growth and nutrition status in Fe ore tailings technosol,providing an important basis for involvement of AM fungi in the eco-engineered pedo

关键词： Fe stress fungal symbiosis K stress mine site rehabilitation mycorrhizal colonization plant biomass amendment plant nutrition water deficiency

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Impact of Metabolic-Syndrome Risk Factors on the Absenteeism of Health Workers from a Brazilian University Hospital

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Health 2018年第6期10卷 853-877页

作者： a.merinda.luedy Danile Leal Barreto Hugo Costa-Ribeiro Júnior Complexo Hospitalar Universitário Professor Edgard Santos Universidade Federal da Bahia Salvador Brazil Federal University of Bahia School of Medicine Salvador Brazil

Objective: Analyzing the association between Metabolic Syndrome (MS) risk factors and work absenteeism due to illnesses among University Hospital employees in Salvador City, Bahia, Brazil. Methods: Cross-sectional study comprised 1173 Bahia Federal University Hospital employees: 57.3% of them were federal employees (statutory officers) and 42.7% were civil servants (CLT employees). Participants were in the age group 41.5 years: 69.4% were female and 30.6% were male. Results: MS prevalence in employees reached 6.6%;women accounted for 69.7% of the total. The percentage increases with age and has similar proportion among directcare providers and ancillary supports personnel, 40.8% and 39.5%, respectively. The risk factor analysis showed 25% hypertension, 54.6% weight excess (18.4% obese and 36.2% overweight patients), 20% hypercholesterolemia, 9.9% hypertriglyceridemia and 6.5% diabetes mellitus prevalence. Absenteeism longer than one day within the studied population reached 40.1%. Osteoarticular diseases were the most common reason for absenteeism, accounting for 50.7% of it: 62.6% of whom were either overweight or obese. The mean cost with absenteeism per employee was R$5492.87 ($2347.00 US Dollars), and it corresponds to annual cost of R 2,587,139.53 ($1,105,610.00 US Dollars). The highest cost with absenteeism caused by illnesses was recorded for female workers;for federal employees who were patient caregivers, who worked in the Pediatric Centre and who worked at night shifts. Conclusion: The high Metabolic Syndrome risk factors and overweight incidence are responsible for the increased costs faced by hospitals due to high absenteeism rates.

关键词： Metabolic Syndrome Risk Factors Absenteeism University Hospital

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