CIGR2010-book-abstra..

MODELLING PHOSPHORUS INPUTS FROM DIFFUSE AND POINT SOURCES WITH
MEPHOS IN GERMANY - A CONTRIBUTION TO THE IMPLEMENTATION OF THE
EU WATER LEGISLATION
BJÖRN TETZLAFF 1
1 B. TETZLAFF, Forschungszentrum Jülich, Germany, b.tetzlaff@fz-juelich.de.
CSBE100081 – The fundamental objectives of the European Union-Water Framework Directive
are to achieve a good status of surface water and groundwater resources by 2015. The
implementation of measures requires spatially detailed data about sources, pathways and levels of
nutrient inputs to receiving water bodies. In this context, water resource managers have great
demand in distributed model results. The MEPhos model has been developed at the Research
Centre Jülich to quantify mean annual P-inputs from artificial drainage, wash-off, groundwater
outflow, soil erosion, rainwater sewers, combined sewer overflows, municipal waste water
treatment plants and industrial effluents. Effects of measures can be predicted and scenario
analyses can be performed. In an oral contribution the approach and model results for Germany
will be presented. This will be done by comparing three typical meso-scale watersheds (River Ems,
River Lahn and River Wupper) with different land use patterns. The effects of selected
management measures on phosphorus inputs will be demonstrated in scenario runs.
NITROGEN AND PHOSPHORUS LOSSES IN SURFACE RUNOFF WATER FROM
VARIOUS CASH CROPPING SYSTEMS
PINGJIN JIAO 1 , TIEQUAN ZHANG 2 , DI XU 1 , SHAOLI WANG 1
1 P. JIAO, China Institute of Water Resources and Hydropower Research, Beijing 100048, China, jiaopj@iwhr.com., 2 T. ZHANG, Greenhouse and
Processing Crops Research Center, Agriculture and Agri-Food Canada, Harrow, ON N0R 1G0.
CSBE100082 – Nitrogen (N) and phosphorus (P) losses from agricultural soils have been
identified as a major contributor to declining surface water quality. Field experiments were
conducted to evaluate the effects of cash crops on surface runoff N and P concentrations and
loadings in the north part of Huaihe River Basin, China. The treatments comprised three cropping
systems including soybean, cotton, and corn, with a bare plot as control. Runoff volume, sediment
yield, runoff N and P loadings were significantly affected by the cash cropping system, in the order
of bare plot corn plot cotton plot soybean plot. The variation of runoff and sediment yield
from different cash cropping systems correlated to the Leaf Area Index (LAI). The factors affecting
the loadings of N and P were also closely related to LAI and surface runoff volume. Dissolved N
and dissolved P were the main forms of N and P losses for cotton and soybean plots, whereas the
particulate N and dissolved P were the main forms of N and P losses for corn plot. Soybean and
cotton production can be the cropping systems that reduce the N and P surface losses during the
peak-flow production period, if economically feasible.
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XVII th World Congress of the International Commission of Agricultural and Biosystems Engineering (CIGR) – Québec City, Canada – June 13-17, 2010