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Phosphorus lake loads from basin land use: proposal for a new simple evaluation method ,
No full textBest management practices for phosphorus control in the Lake Vico basin (Central Italy): spatial allocation and effectiveness evaluation
No full textInviato a “Journal of Environmental Management”
Phosphorus lake loads from basin land use: proposal for a new simple evaluation method ,
No full textPhosphorus export from agricultural land: a simple approach
No full textIn the last few decades, increased inputs of nutrients (mostly nitrogen and phosphorus) to
agricultural land have led to runoff transporting an ever growing portion of these nutrients
from non-point (diffuse) pollution sources into rivers and lakes, thus threatening freshwater
quality.
Phosphorus (P), the focus of the present paper, is principally transported from agricultural
land bound to sediments and can accelerate freshwater eutrophication. Two fundamental
problems face land managers when dealing with the problem of non-point P pollution. The
first is posed by the quantitative evaluation of P loads at basin scale, which is essential in
assessing areas of higher export risk and transport pathways. The second is finding
a satisfactory compromise between two opposing needs: simplicity, to satisfy management,
and complexity, to interpret real processes and their related uncertainty. Uncertainty
is not merely the uncertainty that is intrinsic to model simulations, but also that
deriving from the inherent stochastic variability of real systems.
In the present study, an attempt to maximise the advantages of both approaches was
made. The Lake Vico basin, Central Italy, was selected as a suitable site, since the P
concentration of the lake increased dramatically at the beginning of the 1990s, due to P
non-point pollution source loads.
The simulation model (Groundwater Leaching Effects of Agricultural Management
Systems, GLEAMS) was used to evaluate field scale P losses in two different scenarios:
conventional and conservative agricultural practices. A regression model for each of these
two scenarios was then fitted, to find the best relation between slope, on the one hand, and
P losses. This regression allowed the GLEAMS results to be extended to basin scale, by
a digital terrain model and a geographic information system (GIS), making it possible to
evaluate P export into the lake, thus meeting management needs. The accuracy of this type
of approach was evaluated by comparing model predictions with monitored results of P
concentration in water.
The suggested approach offers solutions to several problems regarding land management
sustainability, including: (i) a quantitative evaluation of different land management
scenarios; (ii) the possibility of zoning landscape according to risk level, comparing different scenarios and related environmental efficiency; (iii) an integrated evaluation of
land cover, in terms of its impact on freshwater ecological status and the long-term water
body condition, as a consequence of land use
Best management practices for phosphorus control in the Lake Vico basin (Central Italy): spatial allocation and effectiveness evaluation
No full textInviato a “Journal of Environmental Management”
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