The soil nitrogen cycle is primarily driven by microbial communities and provides reactive nitrogen for all organisms.With the increasing impact of human activities and climate change,biogeographical explicit patterns...The soil nitrogen cycle is primarily driven by microbial communities and provides reactive nitrogen for all organisms.With the increasing impact of human activities and climate change,biogeographical explicit patterns of soil microbial nitrogen-cycling genes and their associations with nitrogen fluxes are still unknown at the global scale.By conducting a global analysis of 1198 soil metagenomic samples,we verified that agricultural land displayed lower microbial richness and diversity values than did the other habitats.We generated a global map of the genetic potential of N cycle processes in soil and revealed that denitrification and dissimilatory nitrate reduction processes are greater in agricultural centers than in non-agricultural areas and are mainly driven by the mean annual temperature and nitrogen fertilizer application.Soil nitrous oxide(N2O)emissions are greater in agricultural land than in other habitats and are mainly driven by nitrogen fertilizer application,which is consistent with the genetic potential of N2O synthesis.Our study improves the theoretical framework for predicting global soil nitrogen cycling potential under complex variables and highlights the influence weight of human activities and climate factors.We strongly emphasize the importance of rationally applying nitrogen fertilizers to balance agricultural production,ecological health and climate change.展开更多
Chlorine-containing disinfectants have been widely used around the world for the prevention and control of the COVID-19 pandemic.However,at present,little is known about the impact of residual chlorine on the soil mic...Chlorine-containing disinfectants have been widely used around the world for the prevention and control of the COVID-19 pandemic.However,at present,little is known about the impact of residual chlorine on the soil micro-ecological environment.Herein,we treated an experimental soil-plant-microbiome microcosm system by continuous irrigation with a low concentration of chlorine-containing water,and then analyzed the influence on the soil microbial community using metagenomics.After 14-d continuous chlorine treatment,there were no significant lasting effect on soil microbial community diversity and composition either in the rhizosphere or in bulk soil.Although metabolic functions of the rhizosphere microbial community were affected slightly by continuous chlorine treatment,it recovered to the original status.The abundance of several resistance genes changed by 7 d and recovered by 14 d.According to our results,the chlorine residue resulting from daily disinfection may present a slight long-term effect on plant growth(shoot length and fresh weight)and soil micro-ecology.In general,our study assisted with environmental risk assessments relating to the application of chlorine-containing disinfectants and minimization of risks to the environment during disease control,such as COVID-19.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.42377107,22376187 and 42307158).
文摘The soil nitrogen cycle is primarily driven by microbial communities and provides reactive nitrogen for all organisms.With the increasing impact of human activities and climate change,biogeographical explicit patterns of soil microbial nitrogen-cycling genes and their associations with nitrogen fluxes are still unknown at the global scale.By conducting a global analysis of 1198 soil metagenomic samples,we verified that agricultural land displayed lower microbial richness and diversity values than did the other habitats.We generated a global map of the genetic potential of N cycle processes in soil and revealed that denitrification and dissimilatory nitrate reduction processes are greater in agricultural centers than in non-agricultural areas and are mainly driven by the mean annual temperature and nitrogen fertilizer application.Soil nitrous oxide(N2O)emissions are greater in agricultural land than in other habitats and are mainly driven by nitrogen fertilizer application,which is consistent with the genetic potential of N2O synthesis.Our study improves the theoretical framework for predicting global soil nitrogen cycling potential under complex variables and highlights the influence weight of human activities and climate factors.We strongly emphasize the importance of rationally applying nitrogen fertilizers to balance agricultural production,ecological health and climate change.
基金financially supported by the National Natural Science Foundation of China(41907210,71903079,21976161,21777144).
文摘Chlorine-containing disinfectants have been widely used around the world for the prevention and control of the COVID-19 pandemic.However,at present,little is known about the impact of residual chlorine on the soil micro-ecological environment.Herein,we treated an experimental soil-plant-microbiome microcosm system by continuous irrigation with a low concentration of chlorine-containing water,and then analyzed the influence on the soil microbial community using metagenomics.After 14-d continuous chlorine treatment,there were no significant lasting effect on soil microbial community diversity and composition either in the rhizosphere or in bulk soil.Although metabolic functions of the rhizosphere microbial community were affected slightly by continuous chlorine treatment,it recovered to the original status.The abundance of several resistance genes changed by 7 d and recovered by 14 d.According to our results,the chlorine residue resulting from daily disinfection may present a slight long-term effect on plant growth(shoot length and fresh weight)and soil micro-ecology.In general,our study assisted with environmental risk assessments relating to the application of chlorine-containing disinfectants and minimization of risks to the environment during disease control,such as COVID-19.
