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Model based evaluation of agro-environmental measures in the federal state of Brandenburg/Germany concerning nitrogen pollution of ground and surface water.

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Presentation on theme: "Model based evaluation of agro-environmental measures in the federal state of Brandenburg/Germany concerning nitrogen pollution of ground and surface water."— Presentation transcript:

1 Model based evaluation of agro-environmental measures in the federal state of Brandenburg/Germany concerning nitrogen pollution of ground and surface water K. Christian Kersebaum Bettina Matzdorf Joachim Kiesel Annette Piorr Jörg Steidl Leibniz-Centre for Agricultural Landscape Research (ZALF) e. V. WMO / COST / FAO Workshop on Climatic Analysis and Mapping for Agriculture Bologna 14. – 17. June 2005

2 Outline o Introduction o Meteorological characterisation of the study area o Agro-environmental measures in the Federal state of Brandenburg o Modelling diffuse nitrogen leaching from the root zone for different agricultural management options o Identification of vulnerability zones for water resources o Evaluation of actual agro-environmental measures o Conclusions

3 Description of the STATUS QUO (water quality) and evaluation Definition of a target status Development and realization of measure programs and management plans Collecting data about the present status of ground water and surface water Introduction: Requirements of the Water Framework Directive of the EU

4 Development of measure programs Goal: Most efficient allocation of measures for the reduction of nutrient pollution of water resources 3)Allocation of measures to enhance their effectiveness Weighting the emissions from agricultural land on the basis of the retention potential of soils and aquifers Allocation within the region according to a priority ranking 2)Development and evaluation of mitigation options Catalogue of potential measures Side specific evaluation regarding the targets and the consequences for productivity (-> socio-economic effects) 1)Status quo analysis on land use related emissions Identification of land use induced problematic areas Estimation of activity requirements

5 Climatic zoning regarding average air temperature ( )

6 Climatic zoning regarding average precipitation ( )

7 Climatic zoning regarding average potential evapotranspiration ( )

8 Spatial distribution of agro-environmental measures in Brandenburg Germany (status 2000/2001) on arable land on grassland B3-G organic grassland A5 special nature conservation A7 extensive fruit areas A3 restricted grassland A2 extensive grassland riversides A1 extensive grassland B1 controlled integrated horticulture B5 conversion arable land to pasture B3-G organic legume production B3-D organic farming permanent crops B3-A organic arable farming B4 soil conservation measures

9 Methods: Scheme of the nitrogen model HERMES

10 Scenarios for the evaluation of agro-environmental measures Agriculture: conventional arable management (= reference for no agro-environmental measures) Organic farming (with actual live stock density) pasture intensive grassland extensive set aside Grounwater level (water management) 6 constant gw distances: 30, 60, 100, 150, 200, 500 cm below ground all variants were simulated for 8 soil types 5 climatic zones with representative stations and years Smallest common geometry after intersection of soil map, gr.water map, CORINE land cover, field block map - > ca polygons Simulation of cases: 8 soils x 6 gw-levels x 8 livestock density classes x 5 land use systems x 5 climates = 9600 cases

11 organic farming pasture extensive arable land conventional pasture intensive Simulated N-leaching for conventional and extensive management systems (100% Scenarios) Fundamentals Medium range soil map Groundwater distances: HYM 50/DEM 25 weather: DWD representative stations Land use: Corine / biotope types fertilization: Brandenburg Agro Report Live stock density: Agricultural statistics N leaching from root zone [kg N ha -1 ] no agriculture/no data Berlin

12 Simulated nitrate leaching from the root zone of agricultural used land in Brandenburg considering the actual percentage of agro-environmental measures Fundamentals Medium range soil map Groundwater distances: HYM 50/DEM 25 weather: DWD representative stations Land use: Corine / biotope types fertilization: Brandenburg Agro Report Live stock density: Agricultural statistics Agro-enironmv. measures: InVeKos data Nitrate leaching [kg N ha -1 ] non agricultural land no leaching

13 Model based estimation of the site specific nitrate leaching risk (according to Federal State Soil Research, Lower Saxony Hannover) Main land use type and soil texture field capacity of eff.root zone (FCrt) Weather data, soil, land usesimulation groundwater recharge (GWR) GWR [mm year -1 ] Soil solution exchange frequency [% year -1 ] = x 100 (ExF) FCrt [mm year -1 ] Assessment of the downward displacement respectively nitrate leaching risk: ExF [% year -1 ] 250 Risk very low low medium high very high

14 Assessment of potential risk for groundwater pollution Estimation of areas with high impact risk for groundwater very low very high non agricultural land low high medium vulnerability N leaching risk

15 Potential risk for groundwater pollution with nitrogen in Brandenburg Risk classes 0 (very low risk) 1 (low risk) 2 (medium risk) 3 (high risk) 4 very high risk)

16 Assessment of surface water pollution risk based on travel times Acc. to Steidl, 2001 ditchesgroundwater affected sites river recharge areas wet drained sites pollution risk small very high weighting factor: transit timeyears high ( x leaching root zone) very high

17 classes of potential impact High relevance relevant small relevance small relevance,if GW-distance controlled not relevant Non agricultural land Not evaluated Classification of Brandenburg regarding the potential impact on surface water for nitrogen pollution fundamentals: Travel time analysis (Kunkel & Wendland, 1999) N-decay in aquifer (Wendland & Kunkel, 1999)

18 Effects of the present agro-environmental measures in Brandenburg regarding the reduction of nitrogen leaching non agricultural land rivers lakes no effect Reduction of N leaching [kg N ha -1 ]

19 Distribution of agro-environmental measures (AEM) between areas vulnerable or non-vulnerable for nutrient pollution of water resources non vulnerable areas AEM in non vulnerable areas not estimated vulnerable areas AEM in vulnerable areas

20 Summary o simulations based on spatial agro-meteorological information can be used for the site specific assessment of agricultural management effects regarding water pollution. o evaluation of agro-environmental measures considering the targets of the EU Water Framework Directive requires a characteristic of sites regarding their potential impact on ground and surface water. o evaluation of agro-environmental measures in Brandenburg showed that the measures are effective in most of the cases to reduce nitrogen leaching from the root zone. Nevertheless, 75% of the measures were placed in areas with low impact on the water resources. o the effect of the present agro-environmental measures regarding the aims of the Water Framework Directive are therefore not at an optimum. o the method gives a good indication for a targeted allocation of measures and can be used as a basis for the development of measure plans to enhance the effectiveness for the improvement of water quality.

21 Thank you for your attention


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