Showing posts with label nitrogen. Show all posts
Showing posts with label nitrogen. Show all posts

Friday, 5 June 2015

Apping and assessing air pollution using lichens!

CEH released a new mobile phone app today. It gives everyone a way of assessing nitrogen pollution in their local area.



For those that don’t know lichens look like this!


The app is based on a field guide developed by CEH staff and our partners last year


Unlike most of our previous apps, such as iRecord Butterflies and iRecord Ladybirds, the Lichen app isn’t for wildlife recording, rather it’s a tool for assessing the status of nitrogen in your area by surveying lichen on trees. By identifying the presence or absence of nine nitrogen sensitive and eight non-sensitive lichens on tree trunks and branches you can get an estimate of how polluted your area is.

Lichens on a tree trunk – © Ian Leith/Centre for Ecology & Hydrology


Full guidance can be found in the app but basically to get going you need to Identify five oak or five birch trees (not a mixture of the two) in your local area.
  • Trees should be single stemmed (standard) with a straight trunk, and greater than 40 cm in girth. 
  • There also needs to be some accessible branches.
Following the instructions in the app you then identify the lichens growing on the East, West, South of the tree trunks, and then some of the tree branches. You might need to use a hand lens to help with ID as some lichen features are very small!


Here's where you need to sample lichens on your trees.



All the details are then recorded using the App:



And if you have any problems identifying your lichens there’s a handy ID guide built into the App with lots of photos:



Once all the info is complete, you click on the ‘Results’ button. The app works out your lichen indicator score (LIS) and the NAQI score (Nitrogen Air Quality Index).


That’s it! More information on the Lichen App can be found in a news story on our website.

Tuesday, 14 January 2014

CEH research shows ammonia emissions affect sensitive habitats upwind of a poultry farm

CEH recently led a study that found that ammonia emissions from an intensive poultry unit were detected nearly three kilometres upwind, deep within a Natura 2000 site, Newborough Warren, an important sand dune system in Wales. The research was highlighted by the European news alert service Science for Environment Policy, as well as industry website The Poultry Site.

The paper by Dr Laurence Jones describes the findings, which have major implications for the way we consider the control of emissions from intensive animal production units.

Laurence continues:

“While the majority of ammonia is transported downwind, this study suggests that ammonia emissions could be a significant source of nitrogen pollution to sensitive sites even upwind from the source.

Mobile sand dunes, a highly biodiverse habitat



Ammonia caused exceedance of UNECE nitrogen thresholds within the nearby Natura site and experiments showed that dune plant species were being affected by the nitrogen. The paper has already convinced the Environment Agency to consider effects of local wind direction and more recent meteorological data in casework.

Ammonia emissions were monitored around the farm and up to 2.8 km upwind of the prevailing wind direction for a year.

At the furthest sampling point upwind, levels of ammonia concentrations rose and fell in cycles coinciding with emissions from the farm in all months, although were much lower (averaging 0.9 μg/m3, compared with 60.1 μg/m,3 at the farm itself).

The Natura site, Newborough Warren, is one of Wales’ largest sand dune systems and is designated for a wide range of Biodiversity Action Plan priority habitats and rare species. Within parts of the site, ammonia from the farm caused exceedance of the critical level for ammonia of 1 μg/m3, and exceedance of the critical load of 8 – 15 kg N/ha/yr for sand dune grasslands. The farm contributed an additional 50% to the background levels of nitrogen deposition in parts of the site.

Common Centaury, Centaurium erythraea, a low growing biennial
often found on sand dunes


Experiments in the study showed that plants take up the ammonia as a nutrient source, and nitrogen-loving grasses and other species grew better when exposed to the ammonia than other dune species.

The study was funded by Countryside Council for Wales (now Natural Resources Wales). It confirms other CEH studies which highlight that sand dune habitats are sensitive to excess nitrogen pollution from atmospheric deposition and in groundwater.”

Laurence Jones

Additional information


Paper reference: Jones, L., Nizam, M.S., Reynolds, B. et al. (2013). Upwind impacts of ammonia from an intensive poultry unit. Environmental Pollution. 180: 221-228. DOI: 10.1016/j.envpol.2013.05.012

Related CEH links

Staff page of Dr Laurence Jones 

Wednesday, 20 November 2013

Aiming for just enough Nitrogen (and not too much!)

Professor Mark Sutton from CEH is currently in Kampala, Uganda at the 6th International Nitrogen Conference, where he has joined other scientists, agriculturalists, environmentalists, industrialists, economists and policy-makers to discuss issues linked to nitrogen management, including food security, human health, agriculture and the water cycle. On Friday (22 November), it is planned that the Conference will finalize and announce the Kampala Declaration on global nitrogen management.

Prof Sutton chairs the International Nitrogen Initiative (INI) which has organised the conference with the African Nitrogen Centre, International Institute of Tropical Agriculture (IITA) and Makerere University College of Agricultural and Environmental Sciences. Also attending the conference are Prof Sutton's CEH colleagues Prof Nancy Dise and Dr Ute Skiba, each of whom are speaking at the event.

The conference, which runs from 18-22 November 2013, has the tagline "Let us aim for Just Enough N: Perspectives on how to get there for 'too much' and 'too little' regions".

Prof Sutton is chairing a session on Global and Regional Assessment and making a keynote speech "Global Nitrogen Assessment: From Our Nutrient World to the International Nitrogen Management System (INMS)". Our Nutrient World is the UNEP publication edited by Prof Sutton which was published by CEH earlier this year. It is planned that Prof Sutton will also moderate the finalization of the Kampala Declaration on Friday.

The Kampala meeting is believed to be the world's first 'Nitrogen Neutral' conference, where delegates are offered the opportunity to contribute offsetting their nitrogen footprint associated with the conference.  At the same time, the delegates have adopted a demitarian approach - reducing their consumption of meat by half compared with the usual menu at the conference venue, the Speke Resort Hotel - as a means of reducing their own nitrogen footprint.

A key issue being discussed at the meeting is how to get more Nitrogen into Africa, with the main debate being that of fertiliser usage versus biological nitrogen fixation, and how to get the best from both aspects.

This is the sixth international conference to take place after previous events in the Netherlands, USA, China, Brazil and India. The common objective of these conferences is the design of more productive, economic and sustainable food and energy production systems to meet the challenges of the growing global population whilst minimising the cascade of environmental effects posed by nitrogen. Air pollution, water pollution, biodiversity and climate change are all impacted through "too much" nitrogen in the environment, but it is an essential part of the story to ensuring global good security.

The International Nitrogen Initiative is a global effort to optimize nitrogen's beneficial role in sustainable food production and to minimize nitrogen's negative effects on human health and the environment.

Additional information


Prof Nancy Dise is speaking on "Impacts of nitrogen deposition on the ecology and biogeochemistry of European peat bogs: The PEATBOG Project" in a session on N and ecosystem health.

Dr Ute Skiba is speaking on "Comparison of N, C and GHG budgets from European forests, wetlands and agricultural land" in a session on N emissions and climate change.

Related links

Staff page of Prof Mark Sutton

Updated 22 November 2013


Prof Mark Sutton was on the Steering Committee and Editorial Team, and was Part 2 Coordinator, of the new UNEP Synthesis Report, Drawing Down N2O to Protect Climate and the Ozone Layer, which was published on Thursday 21 November 2013, coinciding with the COP19 United Nations Climate Change Conference in Warsaw. Additionally, Dr Ute Skiba from CEH was a lead author on the new report, which aims to inform policymakers and stakeholders about the impacts of nitrous oxide (N2O) emissions on the climate and ozone layer. More details can be found from the UNEP press release.

Friday, 15 November 2013

Integration and reflection - paperblog 8

This week we concentrate on recent papers with CEH scientists as the first author.

PhD student Philip Martin recently published a major paper summarising his research over the last few years. You can read more about "Carbon pools recover more quickly than plant biodiversity in tropical secondary forests" (published in Proceedings of the Royal Society B) on the CEH website and on Philip's blog.

Another PhD student, Christopher Malley, has a new paper out in Atmospheric Research which takes a detailed look at how well two of the UK's atmospheric monitoring 'supersites', including the site run by CEH at Auchencorth Moss in Scotland, represent the UK's background ozone conditions.

CEH is a Centre that carries out both ecological and hydrological science, sometimes together (the clue is in the name!). Our scientists produce many papers that seek to bring together varied data on water quantity, freshwater ecology, and water quality. In recent weeks, CEH scientists have published on estimating concentrations in rivers of different chemicals originating from sewage treatment plants (Keller et al., open access in Environmental Toxicology and Chemistry), and a new approach for predicting phosphorus concentrations in rivers (Greene et al., Journal of Hydrology).

Sometimes it is necessary to take a step back from day to day research to ponder some fundamental questions on how scientific knowledge can be used in wider society. Two examples have recently appeared. Alan Gray has a new paper in Transgenic Research examining whether applied ecology has failed the transgenic crops debate. Stefan Reis and colleagues from CEH, Universities and Health Institutes across the UK have put together a new analysis on how to integrate health and environmental impact analysis to address some of the new public health challenges.

Nitrogen science plays a big role in CEH activities. Laurence Jones and CEH colleagues have produced a new review of the evidence for nitrogen impacts on ecosystem services. Read it in the journal Ecosystem Services, where the paper is open access (full text freely available). Meanwhile, Mark Sutton is lead author on another new open access paper in Environmental Development looking at "Green Economy thinking" and relevance to control of nitrous oxide emissions.

Finally, Robert Mills, who completed a PhD at CEH's site in Bangor, North Wales, has just published a new paper on organic carbon turnover rates in natural and semi-natural topsoils. Working with Professor Ed Tipping, the study concludes with the interesting result that turnover is faster under trees than non-trees. Read more in the journal Biogeochemistry.

That's it. As ever, we welcome suggestions and comments on the material presented in the paperblog. Let us know what you think!

Barnaby Smith, Media Relations Manager

Additional information


If you'd like a fuller picture of new papers from CEH, just follow the CEH Paper Alerts Twitter feed, which lists CEH peer-reviewed papers newly published online. Full details of Centre for Ecology & Hydrology science publications, including those published in peer-reviewed science journals, are eventually catalogued on the NERC Open Research Archive (NORA).

Those of you who follow the scientific literature will know some journal websites require registration and some are subscription-only. CEH, as part of NERC, is working with publishers and funders to make more of our output open access, and we have indicated above where this is the case.

We also publish lots of our other outputs including biological records atlases and project reports. More details can be found in the publications section of the CEH website.

Wednesday, 20 February 2013

Nitrogen narratives in Nairobi – confessions of a reluctant blogger


Professor Mark Sutton from CEH has been in Nairobi, Kenya, this week at the United Nations Environment Programme Governing Council. Here he reports back on experiencing life at the sharp end of the science-policy debate.

Here you find a reluctant blogger. I am currently writing this late at night, after a day full of meeting people of so many nations, many disciplines and many roles.

Half the day has been spent talking - trying to better understand what makes people tick, understanding why they hold their positions. Half the day has been spent talking to press colleagues, and lining up interviews with various newspapers, radio and TV channels - often by mobile phone. Not all of these interviews will come off, but a fraction will, and through them we can reach a much wider audience than our scientific papers and reports. The other half of the day has been spent reading and writing emails, trying to keep up with everything that is going past. (All of this would not have been possible without the great support from UNEP colleagues in DEPI, DCPI and DEWA divisions).

As you can see my maths does not add up –  but you hopefully get the right impression.

In fact impressions are everything here. As a scientist one can spend a long time designing experiments, collecting and interpreting data - refining the message for a scientific audience. But here I am, at the Governing Council of the United Nations Environment Programme (UNEP) in Nairobi. 1000 delegates have joined together to address environmental issues, to review the UNEP programme of work, and even make a few decisions about how to manage the planet's environment better.

So, what about making impressions. My point is that the delegates present here are nothing like a scientific audience. Peer review, statistics, lovely data series, and even new conceptual paradigms, don’t count for much around here. As several people here have commented, by far the strongest thing is "the narrative". Yes, it's great to have the scientific data and the evidence in the background [and really it is VERY important!]. But the thing that grabs their attention is a good story, where we simplify our science to its barest essence, turning complexity into something that everyone can understand.

This seems to be my job for the week. I am here to launch a report, "Our Nutrient World", commissioned by UNEP. It's about "the challenge to produce more food and energy with less pollution". We need nutrients, like nitrogen and phosphorus, to make crops grow and feed the world. The problem is that most of these nutrients leak out to the environment, weaving a web of air, water and soil pollution, contributing to climate change and threatening biodiversity. So let's manage nutrients better, let's think about a suitable goal, and let's get people talking.

In fact we have 10 key actions in our pack of options, from farming management techniques and sewage treatment to the ambition to recapture NOx (nitrogen oxides) into useful products.

But not many people want to talk about smart manure spreading. So I focus on what people do want to talk about. And that is food. In a way it's their call.

Throughout the week I’ve been highlighting the fact that 80% of the harvested nitrogen in the world ends up feeding livestock rather than people, that Europeans eat 70% more protein than needed for a healthy diet, and that, for many of us on the planet, we live in a world of "food luxury" rather than struggling to maintain a minimum "food security".

It’s a great discussion for dinner and just about anywhere you like. And before you know it, the horse-meat scandal has become linked up with nutrient management. People are thinking about their food choices. We have the demitarian option on the table, and the journalists and radio producers want to hear about it.

So it seems somewhat ironic when a lunchtime radio presenter says that: surely I am speaking to the wrong audience. Surely the team from "Our Nutrient World" should instead have been making recommendations to farmers...

And, of course we are.  But if we had only done that, then no one would have been listening. The food debate has given nitrogen an opening - and a chance to explain what we can do about this pan-dimensional problem.

It’s a challenge that crosses all global change issues. We need nitrogen, but we need to manage it better. And really: every citizen needs to know nitrogen. Because until they do, the politicians will not be empowered to make decisions, and start taking the local, national and intergovernmental conversation to the next stage.

Additional information

Prof. Mark Sutton is the lead author on Our Nutrient World - The challenge to produce more food and energy with less pollution. The report is a global overview of nutrient management and was published on 18 February 2013.

Mark was also lead researcher on the European Nitrogen Assessment published in April 2011.

UNEP 1st Universal Session of the Governing Council / Global Ministerial Forum, Nairobi, 18-22 Feb 2013