The Experts below are selected from a list of 97131 Experts worldwide ranked by ideXlab platform
Francisco J. Cervantes - One of the best experts on this subject based on the ideXlab platform.
-
Anaerobic ammonium oxidation linked to sulfate and ferric iron reduction fuels nitrogen loss in marine sediments
Biodegradation, 2018Co-Authors: E. Emilia Rios-del Toro, Edgardo I. Valenzuela, Nguyen E. López-lozano, M. Guadalupe Cortés-martínez, Miguel A. Sánchez-rodríguez, Omar Calvario-martínez, Salvador Sánchez-carrillo, Francisco J. CervantesAbstract:Availability of fixed nitrogen is a pivotal driver on primary productivity in the oceans, thus the identification of key Processes triggering nitrogen losses from these ecosystems is of major importance as they affect ecosystems function and consequently global biogeochemical cycles. Denitrification and anaerobic ammonium oxidation coupled to nitrite reduction (Anammox) are the only identified marine sinks for fixed nitrogen. The present study provides evidence indicating that anaerobic ammonium oxidation coupled to the reduction of sulfate, the most abundant electron acceptor present in the oceans, prevails in marine sediments. Tracer analysis with ^15N-ammonium revealed that this Microbial Process, here introduced as Sulfammox, accounts for up to 5 μg ^15N_2 produced g^−1 day^−1 in sediments collected from the eastern tropical North Pacific coast. Raman and X-ray diffraction spectroscopies revealed that elemental sulfur and sphalerite (ZnFeS) were produced, besides free sulfide, during the course of Sulfammox. Anaerobic ammonium oxidation linked to Fe(III) reduction (Feammox) was also observed in the same marine sediments accounting for up to 2 μg ^15N_2 produced g^−1 day^−1. Taxonomic characterization, based on 16S rRNA gene sequencing, of marine sediments performing the Sulfammox and Feammox Processes revealed the Microbial members potentially involved. These novel nitrogen sinks may significantly fuel nitrogen loss in marine environments. These findings suggest that the interconnections among the oceanic biogeochemical cycles of N, S and Fe are much more complex than previously considered.
Lijuan Chen - One of the best experts on this subject based on the ideXlab platform.
-
shifts in soil Microbial metabolic activities and community structures along a salinity gradient of irrigation water in a typical arid region of china
Science of The Total Environment, 2017Co-Authors: Yongjiu Feng, Hang Zheng, Qi Feng, Changsheng Li, Yan Zhao, Lijuan Chen, H LiAbstract:Saline water irrigation can change soil environment, which thereby influence soil Microbial Process. Based on a field experiment, the shifts in soil Microbial metabolic activities and community structures under five irrigation salinities were studied using Biolog and metagenomic methods in this study. The results demonstrated that Microbial metabolic activities were greatly restrained in saline water irrigated soils, as average well color development (AWCD) reduced under all saline water irrigation treatments. Although no significant difference in carbon substrate utilization of all six categories was observed among Mild, Medium, High and Severe treatments, the consumption of sole carbon source was significantly varied. Especially, asparagine, galacturonic, putrescine and 4-benzoic acid played a decisive role in dominating the differences. Soil bacterial richness and diversity increased with irrigation salinity while the number of bacterial phyla decreased. Three significantly increased (Proteobacteria, Actinobacteria and Chloroflexi), two decreased (Planctomycetes, Bacteroidetes) and two irresponsive (Gemmatimonadetes and Acidobacteria) phyla were observed as the dominant groups in saline water irrigated soils. The results presented here could improve the understanding of the soil biological Process under saline circumstance.
-
impacts of aquaculture wastewater irrigation on soil Microbial functional diversity and community structure in arid regions
Scientific Reports, 2017Co-Authors: Yongjiu Feng, Fengrui Li, Hang Zheng, Qi Feng, Changsheng Li, Yan Zhao, Lijuan Chen, Huiya LiAbstract:Aquaculture wastewater is one of the most important alternative water resources in arid regions where scarcity of fresh water is common. Irrigation with this kind of water may affect soil Microbial functional diversity and community structure as changes of soil environment would be significant. Here, we conducted a field sampling to investigate these effects using Biolog and metagenomic methods. The results demonstrated that irrigation with aquaculture wastewater could dramatically reduce soil Microbial functional diversity. The values of diversity indices and sole carbon source utilization were all significantly decreased. Increased soil salinity, especially Cl concentration, appeared primarily associated with the decreases. Differently, higher bacterial community diversity was obtained in aquaculture wastewater irrigated soils. More abundant phyla Actinobacteria, Chloroflexi, Acidobacteria, Gemmatimonadetes and fewer members of Proteobacteria, Bacteroidetes and Planctomycetes were found in this kind of soils. Changes in the concentration of soil Cl mainly accounted for the shifts of bacterial community composition. This research can improve our understanding of how aquaculture wastewater irrigation changes soil Microbial Process and as a result, be useful to manage soil and wastewater resources in arid regions.
Ashish A Malik - One of the best experts on this subject based on the ideXlab platform.
-
towards a Microbial Process based understanding of the resilience of peatland ecosystem service provisioning a research agenda
Science of The Total Environment, 2021Co-Authors: Jonathan P Ritson, Danielle Alderson, Clare H Robinson, Alexandra E Burkitt, Andreas Heinemeyer, Andrew G Stimson, Angela Gallegosala, Angela Harris, A Quillet, Ashish A MalikAbstract:Peatlands are wetland ecosystems with great significance as natural habitats and as major global carbon stores. They have been subject to widespread exploitation and degradation with resulting losses in characteristic biota and ecosystem functions such as climate regulation. More recently, large-scale programmes have been established to restore peatland ecosystems and the various services they provide to society. Despite significant progress in peatland science and restoration practice, we lack a Process-based understanding of how soil microbiota influence peatland functioning and mediate the resilience and recovery of ecosystem services, to perturbations associated with land use and climate change. We argue that there is a need to: in the short-term, characterise peatland Microbial communities across a range of spatial and temporal scales and develop an improved understanding of the links between peatland habitat, ecological functions and Microbial Processes; in the medium term, define what a successfully restored 'target' peatland microbiome looks like for key carbon cycle related ecosystem services and develop Microbial-based monitoring tools for assessing restoration needs; and in the longer term, to use this knowledge to influence restoration practices and assess progress on the trajectory towards 'intact' peatland status. Rapid advances in genetic characterisation of the structure and functions of Microbial communities offer the potential for transformative progress in these areas, but the scale and speed of methodological and conceptual advances in studying ecosystem functions is a challenge for peatland scientists. Advances in this area require multidisciplinary collaborations between peatland scientists, data scientists and microbiologists and ultimately, collaboration with the modelling community. Developing a Process-based understanding of the resilience and recovery of peatlands to perturbations, such as climate extremes, fires, and drainage, will be key to meeting climate targets and delivering ecosystem services cost effectively.
Hang Zheng - One of the best experts on this subject based on the ideXlab platform.
-
shifts in soil Microbial metabolic activities and community structures along a salinity gradient of irrigation water in a typical arid region of china
Science of The Total Environment, 2017Co-Authors: Yongjiu Feng, Hang Zheng, Qi Feng, Changsheng Li, Yan Zhao, Lijuan Chen, H LiAbstract:Saline water irrigation can change soil environment, which thereby influence soil Microbial Process. Based on a field experiment, the shifts in soil Microbial metabolic activities and community structures under five irrigation salinities were studied using Biolog and metagenomic methods in this study. The results demonstrated that Microbial metabolic activities were greatly restrained in saline water irrigated soils, as average well color development (AWCD) reduced under all saline water irrigation treatments. Although no significant difference in carbon substrate utilization of all six categories was observed among Mild, Medium, High and Severe treatments, the consumption of sole carbon source was significantly varied. Especially, asparagine, galacturonic, putrescine and 4-benzoic acid played a decisive role in dominating the differences. Soil bacterial richness and diversity increased with irrigation salinity while the number of bacterial phyla decreased. Three significantly increased (Proteobacteria, Actinobacteria and Chloroflexi), two decreased (Planctomycetes, Bacteroidetes) and two irresponsive (Gemmatimonadetes and Acidobacteria) phyla were observed as the dominant groups in saline water irrigated soils. The results presented here could improve the understanding of the soil biological Process under saline circumstance.
-
impacts of aquaculture wastewater irrigation on soil Microbial functional diversity and community structure in arid regions
Scientific Reports, 2017Co-Authors: Yongjiu Feng, Fengrui Li, Hang Zheng, Qi Feng, Changsheng Li, Yan Zhao, Lijuan Chen, Huiya LiAbstract:Aquaculture wastewater is one of the most important alternative water resources in arid regions where scarcity of fresh water is common. Irrigation with this kind of water may affect soil Microbial functional diversity and community structure as changes of soil environment would be significant. Here, we conducted a field sampling to investigate these effects using Biolog and metagenomic methods. The results demonstrated that irrigation with aquaculture wastewater could dramatically reduce soil Microbial functional diversity. The values of diversity indices and sole carbon source utilization were all significantly decreased. Increased soil salinity, especially Cl concentration, appeared primarily associated with the decreases. Differently, higher bacterial community diversity was obtained in aquaculture wastewater irrigated soils. More abundant phyla Actinobacteria, Chloroflexi, Acidobacteria, Gemmatimonadetes and fewer members of Proteobacteria, Bacteroidetes and Planctomycetes were found in this kind of soils. Changes in the concentration of soil Cl mainly accounted for the shifts of bacterial community composition. This research can improve our understanding of how aquaculture wastewater irrigation changes soil Microbial Process and as a result, be useful to manage soil and wastewater resources in arid regions.
E. Emilia Rios-del Toro - One of the best experts on this subject based on the ideXlab platform.
-
Anaerobic ammonium oxidation linked to sulfate and ferric iron reduction fuels nitrogen loss in marine sediments
Biodegradation, 2018Co-Authors: E. Emilia Rios-del Toro, Edgardo I. Valenzuela, Nguyen E. López-lozano, M. Guadalupe Cortés-martínez, Miguel A. Sánchez-rodríguez, Omar Calvario-martínez, Salvador Sánchez-carrillo, Francisco J. CervantesAbstract:Availability of fixed nitrogen is a pivotal driver on primary productivity in the oceans, thus the identification of key Processes triggering nitrogen losses from these ecosystems is of major importance as they affect ecosystems function and consequently global biogeochemical cycles. Denitrification and anaerobic ammonium oxidation coupled to nitrite reduction (Anammox) are the only identified marine sinks for fixed nitrogen. The present study provides evidence indicating that anaerobic ammonium oxidation coupled to the reduction of sulfate, the most abundant electron acceptor present in the oceans, prevails in marine sediments. Tracer analysis with ^15N-ammonium revealed that this Microbial Process, here introduced as Sulfammox, accounts for up to 5 μg ^15N_2 produced g^−1 day^−1 in sediments collected from the eastern tropical North Pacific coast. Raman and X-ray diffraction spectroscopies revealed that elemental sulfur and sphalerite (ZnFeS) were produced, besides free sulfide, during the course of Sulfammox. Anaerobic ammonium oxidation linked to Fe(III) reduction (Feammox) was also observed in the same marine sediments accounting for up to 2 μg ^15N_2 produced g^−1 day^−1. Taxonomic characterization, based on 16S rRNA gene sequencing, of marine sediments performing the Sulfammox and Feammox Processes revealed the Microbial members potentially involved. These novel nitrogen sinks may significantly fuel nitrogen loss in marine environments. These findings suggest that the interconnections among the oceanic biogeochemical cycles of N, S and Fe are much more complex than previously considered.