Sentences with phrase «nitrogen cycling»

However, newer studies suggested that other seasons are also important for nitrogen cycling in the region, and the research team aimed to uncover more details.

Our next global challenge is likely to be human modification of the global nitrogen cycle.

Given the current dramatic rate of change in the ocean nitrogen cycle the researchers are not sure how long it will take for marine ecosystems to adapt.

Of these, it is generally assumed that the marine nitrogen cycle will be especially susceptible to disruption [5].

Doing so creates unnatural nitrogen cycles so let some accumulate.

The large fraction of the planet covered in deep waters guarantees that most carbon sequestration and significant nitrogen cycling in the ocean occurs here.

Nitrogen has been wrested from the sky, turned into plant food and, ultimately, more people — a doubling of the amount of nitrogen cycling through planetary systems.

Long - term CO2 enrichment of southern African C4 grassland revealed limited impacts on nitrogen cycling and soil C sequestration (Stock et al., 2005), in contrast to greater C sequestration in short - term studies of grassland ecosystems (e.g., Williams et al., 2004a).

«It's a hard question to answer, because it takes a long time to see how ecosystem carbon and nitrogen cycles change.»

«We know that biochar impacts the soil nitrogen cycle, and that's how it reduces nitrous oxide,» said Masiello, a professor of Earth, environmental and planetary science.

In late summer and early fall of 2014, the team sailed through the southernmost reaches of the Southern Ocean's Pacific sector in search of new insights into nitrogen cycling.

By using a combination of crop growth, hydrological, carbon and nitrogen cycle models, researchers found that the estimated land suitable for bioenergy grasses — particularly Miscanthus, the most productive bioenergy crop — is limited, despite its relatively high biomass productivity and low water consumption per unit of ethanol.

It would massively increase the pressure on two other crucial finite resources — land and water — and imply even more use of nitrogen - based fertilisers that acidify soils, upset the natural nitrogen cycle and create dead zones in rivers and oceans.

Using sediment gathered from the ocean floor in different areas of the world, the researchers were able to confirm that as the ice sheets started melting and the climate warmed up at the end of the last ice age, 18,000 years ago, the marine nitrogen cycle started to accelerate.

The soil samples from areas with kudzu also had increased nitrogen cycling rates.

The so - called nitrogen cycle is a natural phenomenon that occurs in microcosm in the aquarium, but reef tanks need help to reduce nitrate levels.

The new study, by researchers at the University of Vienna and the International Institute of Applied System Analysis explores the role of microbial cheaters for soil carbon and nitrogen cycling using a computer model.

The ocean had stabilized itself in its new, warmer state, in which the overall nitrogen cycle was running faster, by about 8,000 years ago.

Continued studies of Arctic fungi will provide new carbon and nitrogen cycling data to improve climate prediction models.

A new study shows that nitrogen - feeding organisms exist all over the deep ocean, and not just in large oxygen - depleted «dead zones,» changing the way we think about the delicate nitrogen cycle.

Global patterns and substrate - based mechanisms of the terrestrial nitrogen cycle.

Zaehle, S. & Friend, A. D. Carbon and nitrogen cycle dynamics in the O - CN land surface model: 1 model description, site - scale evaluation, and sensitivity to parameter estimates.

But I too must remember to look at the bigger picture: there was bound to be an environmental catastrophe sooner or later due to one thing or another, over-population, loss of soil fertility, unbalanced nitrogen cycle, loss of available phosphorus for fertiliser, deforestation, globalisation (as it has been practiced), pollution, etcetera.

With regard to emissions from wastewater transport and treatment (Figure 10.2 b), the CH4 is microbially produced under strict anaerobic conditions as in landfills, while the N2O is an intermediate product of microbial nitrogen cycling promoted by conditions of reduced aeration, high moisture and abundant nitrogen.

Multiple metrics of nitrogen cycling were notably different with moss mortality and had significant implications for soil fertility.

For anyone doubting whether a lowly hominid could be a planet - scale influence, a paper on the human domination of the global nitrogen cycle in the Oct. 8 edition of Science would be a useful read.

The invention of synthetic fertilizer, where nitrogen is taken from an inert chemical form in the air and turned into ammonia, has had a profound effect on nitrogen cycling.

Current research includes studies of the food web structure and biogeochemistry of Arctic streams and rivers, nitrogen cycling in headwater streams and estuaries, and the impacts of climate change on the freshwater cycle of the Arctic.

«It's a hard question to answer, because it takes a long time to see how ecosystem carbon and nitrogen cycles change.»

However, a study published this week in Science showed human activities, in particular industrial and agricultural processes, have also had significant impacts on the upper ocean nitrogen cycle.

Since changes in the soil nitrogen cycle are driven by microbes, could bacteria associated with invasive species not only be responsible for the observed changes in soil nutrient concentrations, but also for enabling the continued growth and persistence of the invader species?

It would be nice to see the IPCC make projections for atmospheric greenhouse gas concentrations over the next 100 years based at least in part on carbon / nitrogen cycle models, hydrology / permafrost models, and so on.

«The North Pacific is so vast it is hard to imagine that humans could impact the natural nitrogen cycle.»

Positive: Increased soil organic matter from increased productivity in some areas; increased nitrogen cycling

Yet what of the ecological systems that complement the earth, allowing life to exist and be enjoyed, from (1) the water cycle of evaporation and rain to (2) the carbon and oxygen cycle of plants producing oxygen that humans and animals need and giving off carbon dioxide for the plants to (3) the nitrogen cycle that causes the production of proteins?

The parable of the rivet popper is particularly applicable to the threat of human activity to the cycles of nature such as the nitrogen cycle or the carbon cycle, which are part of the life - support systems of nature.

Nor are we sure what the consequences would be if chemicals we add to the environment killed off important microorganisms in the nitrogen cycle.

On the other hand the thirteenth rivet popped from a wing, or the extinction of a key species in the cycling of nitrogen, for example could lead to a serious malfunctioning of the nitrogen cycle.

The debate centers on how nitrogen — one of the most important food sources for ocean life and a controller of atmospheric carbon dioxide — becomes converted to a form that can exit the ocean and return to the atmosphere where it is reused in the global nitrogen cycle.

Global warming, from the release of carbon dioxide and perturbations to the nitrogen cycle from fertilizers

«Understanding nitrogen cycling is crucial to understanding the productivity of the oceans as well as the global climate,» he said.

Gaseous ammonia is a natural part of Earth's nitrogen cycle, but excess ammonia is harmful to plants and reduces air and water quality.

«Did Mars once have a nitrogen cycle?

Scientists propose a list of planetary boundaries for human impacts ranging from biodiversity loss to the global nitrogen cycle

«The presence of nitrogen - bearing compounds in Martian soil means the existence of a source of biochemically accessible nitrogen, and suggest that it could be a nitrogen cycle sometime along the evolution of Mars as a planet,» he says.