Landscape analysis of the transport_ transformation and fate of by hkksew3563rd

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									Landscape analysis of the transport, transformation
and fate of reactive nitrogen and abatement
strategies (LANAS)




The LANAS project provides the first landscape            ‘sacrificial’ woodland strips to provide a buffer zone
scale, multi-pollutant modelling approach for nitrogen    between sources of nitrogen emission and nearby
in the UK, allowing interactions between ammonia,         sensitive ecosystems. The woodland will take up
nitrous oxide and nitrate to be addressed at the field    some of the deposited nitrogen, and disperse and
and farm level.                                           therefore dilute the atmospheric concentration of the
                                                          pollutant. Other scenarios could involve assessing
The LANAS approach provides a framework that can          how new planning applications (eg for large intensive
be used to investigate strategies to reduce nitrogen      poultry farms) could affect the surrounding area and
pollution from different sources through spatial          suggesting alternative locations, particularly if the
planning at a landscape level. This involves simulating   proposed development was near a protected area.
the application of measures to reduce the impacts on
the environment and looking at the trade-offs of the      The two examples overleaf show how planting
different forms of nitrogen. For instance, ploughing-in   woodlands as buffer zones, either around farm
manure immediately after putting it on a field may        sources or around the nature reserves themselves,
reduce ammonia emissions to the atmosphere but            could reduce nitrogen deposition on sensitive
increase nitrate leaching. It may also involve planting   ecosystems, such as nature reserves.
Landscape analysis of the transport, transformation and fate
of reactive nitrogen and abatement strategies (LANAS)
Ulli Dragosits, David Fowler, Mark Sutton, Mark Theobald, Centre for Ecology & Hydrology Edinburgh.
Ulli Dragosits, Chris Place, The University of Edinburgh. Jo Smith, Gosia Sozanska, Department of Plant
and Soil Science, University of Aberdeen. Lorna Brown, Agustin Del Prado, David Scholefield, Institute of
Grassland and Environmental Research. Andrew Angus, Ian Hodge, Department of Land Economy,
University of Cambridge Jim Webb, ADAS Wolverhampton. Paul Whitehead, Department of Geography,
University of Reading.



Why we did this research                          A catchment model (INCA)
The LANAS model framework was                     may also receive leached
developed to study the interactions               nitrogen data from the results
between emissions and effects of different        of the crop, grassland and
nitrogen pollutants, eg. ammonia, nitrous         farm model, but it is not part
oxide, nitrate, at a local level. This is         of the integrated LANAS
especially important as nitrogen pollutants       framework.
disperse in widely varying ways in the
countryside. The impact of the pollution          Main results/findings
depends on the relationship between the           The model results showed
location of the agricultural source and the       the large spatial variability of
forest and semi-natural ecosystems                emissions, leaching,
receiving the pollutants. To meet national        concentrations and
and international policy commitments,             deposition of different forms
measures to reduce the effects of nitrogen        of nitrogen in the study
pollutants need to be implemented locally.        landscape, and how
While the UK is implementing measures to          abatement measures may
reduce emissions of a particular nitrogen         influence the effects of the
species, eg ammonia, this may have                excess nitrogen on sensitive
adverse effects on emissions of another           ecosystems. The LANAS
nitrogen species, eg nitrate leaching. Thus       model allows, for the first
it is important to investigate the interactions   time, the exploration of
between the different nitrogen forms, to          interactions and trade-offs
ensure one pollution problem is not simply        between the different forms
swapped for another.                              of nitrogen at the landscape
                                                  scale in the UK. LANAS helps
How we did it                                     to investigate and quantify
We surveyed the study areas (approx. 9 x          ways to improve the
12km) with regard to land use, crop types,        environment by reducing
agricultural management and stored the            local emissions.
data in a spatial database, with separate
records for each field, farm and other land       Why these results are
use types. We linked together different           important
established and newly developed models            It is essential to protect
calculating emissions from arable fields          sensitive ecosystems with
(SUNDIAL), grassland (NGAUGE), and                solutions that do not increase
farmyards (FYNE), as well as an                   emissions of one form of
atmospheric dispersion and deposition             nitrogen while attempting to
model (LADD) through the common                   decrease emissions of
database via a controller program. This           another. Modelling is one way
program calls to the different models in          to investigate the interactions
turn, as well as calling the database             of nitrogen pollutants and the
between monthly model runs, to feed the           trade-offs between them at
results back into the database and create         the landscape scale. The
new updated input datasets for the                LANAS approach uses data
models’ next iteration. For example, this         from a real agricultural
allows the deposition model to pick up the        landscape to investigate the
current month’s emissions from all different      overall efficiency and cost
sources, which are then dispersed and             effectiveness of possible
deposited back to the ground. The field           abatement measures.
and farm models then take the deposition
estimates from the dispersion model into          For further information contact:
account in their next iteration of emission       Ulli Dragosits
calculations.                                     Centre for Ecology & Hydrology Edinburgh
                                                  Bush Estate, Penicuik EH26 0QB
                                                  Tel: 0131 445 4343, email: ud@ceh.ac.uk

								
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