搜索结果: 31-45 共查到“理学 Cycling”相关记录102条 . 查询时间(0.931 秒)
Mercury and methylmercury cycling in sediments of the mid-Atlantic continental shelf and slope
Mercury methylmercury cycling slope
2014/4/17
We present a detailed study of the biogeochemical factors controlling mercury (Hg) distribution,
methylmercury (MeHg) production, and MeHg efflux in sediments of the mid-Atlantic continental shelf an...
Temporal and spatial variability in the cycling of nitrogen within a constructed wetland: A whole-system stable-isotope-addition experiment
Temporal spatial variability in the cycling of nitrogen a constructed wetland A whole-system stable-isotope-addition experiment
2014/4/17
Constructed wetlands attenuate effluent nutrients, are hydrodynamically well defined, and are a useful proxy for the study of nitrogen (N) transformation in eutrophic natural systems. A whole-system s...
Trace metal cycling in the surface water of the South China Sea: Vertical fluxes, composition, and sources
Trace metal cycling the surface water the South China Sea: Vertical fluxes composition sources
2014/4/16
We deployed floating traps in the surface waters of the South China Sea on four occasions at depths of 30 m,100 m, and 160 m from 2006 to 2007 to quantify vertical metal fluxes in the surface water an...
Direct determination of nitrogen cycling rates and pathways in Arctic fjord sediments (Svalbard, Norway)
pathways nitrogen cycling rates
2014/4/16
Results from a study of benthic nitrogen cycling in two Arctic fjords are presented. Intact sediment core
incubations were used to quantify net fluxes of dissolved inorganic nitrogen, organic nitroge...
The role of polysaccharides and diatom exudates in the redox cycling of Fe and the photoproduction of hydrogen peroxide in coastal seawaters
polysaccharides and diatom exudates the redox cycling of Fe the photoproduction of hydrogen peroxide coastal seawaters
2010/1/21
The effect of artificial acidic polysaccharides (PS) and exudates of Phaeodactylum tricornutum on the half-life of Fe(II) in seawater was investigated in laboratory experiments. Strong photochemical h...
Redox Cycling Effect on the Surface-enhanced Raman Scattering Signal of Crystal Violet Molecules at Nanostructured Interdigitated Array Electrodes
Redox Cycling the Surface-enhanced Raman Scattering Signal Crystal Violet Molecules
2010/9/16
Nanostructured interdigitated array (IDA) electrodes with different inter-electrode spacing were demonstrated to improve the detection sensitivity of short-lived electroactive species and to follow in...
Chemolithoautotrophic production mediating the cycling of the greenhouse gases N2O and CH4 in an upwelling ecosystem
Chemolithoautotrophic production the greenhouse gases N2O and CH4 an upwelling ecosystem
2010/1/21
The high availability of electron donors occurring in coastal upwelling ecosystems with marked oxyclines favours chemoautotrophy, in turn leading to high N2O and CH4 cycling associated with aerobic NH...
Photolysis imprint in the nitrate stable isotope signal in snow and atmosphere of East Antarctica and implications for reactive nitrogen cycling
nitrate stable isotope signal snow atmosphere East Antarctica reactive nitrogen cycling
2009/11/19
The nitrogen (δ15N) and triple oxygen (δ17O and δ18O) isotopic composition of nitrate (NO3−) was measured year-round in the atmosphere and snow pits at Dome C, Antarctica (DC, 75.1° S, 123.3° E)...
Lakes and reservoirs as regulators of carbon cycling and climate
Lakes and reservoirs regulators carbon cycling and climate
2014/4/17
We explore the role of lakes in carbon cycling and global climate, examine the mechanisms influencing carbon pools and transformations in lakes, and discuss how the metabolism of carbon in the inland ...
Distribution,origin and cycling of carbon in the Tana River (Kenya):a dry season basin-scale survey from headwaters to the delta
Distribution origin cycling carbon season basin-scale survey headwaters delta
2010/1/21
The Tana River basin (TRB) is the largest in Kenya (~120 000 km2). We conducted a survey during the dry season throughout the TRB, analyzing a broad suite of biogeochemical parameters. Biogeochemical ...
NITROGEN CYCLING AND REMOVAL EFFICIENCY IN A RICE FIELD
nitrogen nitrogen cycle mass balance water quality
2009/10/13
The major sources and sinks of nitrogen (N) were calculated during the rice growth cycle in a lowland paddy field in Japan in order to better understand contamination of surface and groundwater. Depos...
Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan)
Nitrogen cycling deep ocean margin sediment Sagami Bay Japan
2014/4/18
On the basis of in situ NO3-1 microprofiles and chamber incubations complemented by laboratory-based assessments of anammox and denitrification we evaluate the nitrogen turnover of an ocean margin sed...
Benthic biogeochemical cycling, nutrient stoichiometry, and carbon and nitrogen mass balances in a eutrophic freshwater bay
Benthic biogeochemical cycling nutrient stoichiometry carbon and nitrogen mass balances eutrophic freshwater bay
2014/4/18
Green Bay, while representing only ~7% of the surface area and ~1.4% of the volume of Lake Michigan, contains one-third of the watershed of the lake, and receives approximately one-third of the total ...
Benthic biogeochemical cycling, nutrient stoichiometry, and carbon and nitrogen mass balances in a eutrophic freshwater bay
Benthic biogeochemical cycling nutrient stoichiometry
2014/4/18
Green Bay, while representing only ,7% of the surface area and ,1.4% of the volume of Lake Michigan,
contains one-third of the watershed of the lake, and receives approximately one-third of the total...
Nitrogen cycling in a deep ocean margin sediment (Sagami Bay, Japan)
a deep ocean margin sediment Nitrogen cycling
2014/4/18
On the basis of in situ NO{
3 microprofiles and chamber incubations complemented by laboratory-based
assessments of anammox and denitrification we evaluate the nitrogen turnover of an ocean margin s...