نتایج جستجو برای: dissolved nitrate

تعداد نتایج: 62972  

Journal: :The Science of the total environment 2007
Toshiro Yamada Sally D Logsdon Mark D Tomer Michael R Burkart

Substantial questions remain about the time required for groundwater nitrate to be reduced below 10 mg L(-1) following establishment of vegetated riparian buffers. The objective of this study was to document changes in groundwater nitrate-nitrogen (NO3-N) concentrations that occurred within a few years of planting a riparian buffer. In 2000 and 2001 a buffer was planted adjacent to a first-orde...

2006

Bacterial uptake or release of dissolved nitrogen compounds (amino nitrogen, urea, ammonium and nitrate) were examined in 0.8 pm filtered water from an estuary (Santa Rosa Sound [SRS], northwestern Florida) and an open-water location in the Gulf of Mexico (GM). The bacterial nutrient dynamics were related to oxygen consumption and activity of enzymes involved in nitrogen assimilation (glutamate...

2013

The physico-chemical characteristics, phytoplankton composition and distribution at the East mole area of the Lagos harbour were investigated between January and June, 2012. The physicochemical conditions varied between high brackish and sea water chemistry. Records were Air (26 33 0 C) and Water temperatures (28 31 0 C), Salinity (19.40 30.72 0 /00), Nutrients (Nitrate ≥ 3.11 mg/L; Phosphate ≥...

2016
John Vincent Loperfido Jerald L. Schnoor

The runoff of suspended solids and nutrients from land into the nation’s lakes and rivers can have severe impacts on the health of these systems and their uses. Highfrequency environmental data from sensors can provide insight into fundamental biogeochemical processes that dictate water quality and provide regulators with valuable knowledge on how to manage critical resources. The goal of this ...

2012
Fungyi Chow

Macroalgae or macrophytes are a heterogeneous assemblage of macroscopic eukaryotes belonging to various evolutionary lineages, which live predominantly in aquatic habitats. They have undifferentiated vegetative bodies organized in pseudoparanchymatous and parenchymatous bodies. As with higher plants, marine macroalgae or seaweeds are photosynthetic species that, by harvesting sunlight energy, c...

2017
Jessie Guyader Emilio M. Ungerfeld Karen A. Beauchemin

A decrease in methanogenesis is expected to improve ruminant performance by allocating rumen metabolic hydrogen ([2H]) to more energy-rendering fermentation pathways for the animal. However, decreases in methane (CH4) emissions of up to 30% are not always linked with greater performance. Therefore, the aim of this study was to understand the fate of [2H] when CH4 production in the rumen is inhi...

2011
Craig E. Nelson Craig A. Carlson

Nutrient enrichment of high-elevation freshwater ecosystems by atmospheric deposition is increasing worldwide, and bacteria are a key conduit for the metabolism of organic matter in these oligotrophic environments. We conducted two distinct in situ microcosm experiments in a high-elevation lake (Emerald Lake, Sierra Nevada, California, USA) to evaluate responses in bacterioplankton growth, carb...

Journal: :Freshwater Science 2021

Tropical forests store large amounts of Earth’s terrestrial C, but many tropical montane streams have low dissolved organic matter (DOM). This availability energy likely limits certain pathways inorganic N uptake, as evidenced by the high rates nitrification and predominance nitrate (NO3−) in total pool seen forests. To explore influence DOM on stream cycling, we performed nutrient pulse additi...

2012
Katherine R. M. Mackey Cécile E. Mioni John P. Ryan Adina Paytan

This study explores the cycling of phosphorus (P) in the euphotic zone following upwelling in northeastern Monterey Bay (the Red Tide Incubator region) of coastal California, with particular emphasis on how bacteria and phytoplankton that form harmful algal blooms mediate and respond to changes in P availability. In situ measurements of nutrient concentrations, phytoplankton community compositi...

Journal: :Proceedings. Biological sciences 2015
Leïla Ezzat Jean-François Maguer Renaud Grover Christine Ferrier-Pagès

Anthropogenic nutrient enrichment affects the biogeochemical cycles and nutrient stoichiometry of coastal ecosystems and is often associated with coral reef decline. However, the mechanisms by which dissolved inorganic nutrients, and especially nitrogen forms (ammonium versus nitrate) can disturb the association between corals and their symbiotic algae are subject to controversial debate. Here,...

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