DBPapers
DOI: 10.5593/SGEM2014/B31/S12.056

INVESTIGATING THE CORRELATION BETWEEN AGRI- ENVIRONMENTAL MEASURES AND GROUNDWATER NITRATE CONCENTRATION USING A GEO-STATISTICAL APPROACH

A. Vasile, T. Pistorius; J. Schalle, I. Sandric; R. Drobot
Wednesday 1 October 2014 by Libadmin2014

References: 14th International Multidisciplinary Scientific GeoConference SGEM 2014, www.sgem.org, SGEM2014 Conference Proceedings, ISBN 978-619-7105-13-1 / ISSN 1314-2704, June 19-25, 2014, Book 3, Vol. 1, 429-440 pp

ABSTRACT
In order to minimize the negative environmental impacts of agriculture, the EU has implemented agri-environmental programs. This study investigates the correlation between the implementation of these measures and the groundwater nitrate concentration in Baden Wurttemberg (Germany). Only the measures that would have a direct impact on groundwater quality were chosen and their extent was attributed to each county from 2000 to 2012.Using ordinary kriging and weighted raster calculation, groundwater nitrate concentration maps were generated from 1990 to 2012. Using ArcGIS 10.1 and R statistical software, the correlations between the evolutions of groundwater nitrate and implementation of agri-environmental measures were determined using Spearman’s rho and the corresponding p value, using three different methods. Also the evolution of groundwater nitrate concentration was determined for different land use types for the period of 1990-2012. Results varied slightly between the different methods, but definite patterns were visible: there were significantly more negative correlations (also with a much higher rho) than positive ones; in some instances negative correlation coefficients went above 0.9 (p

<0.05)>

permanent crops > heterogeneous agricultural areas > pastures >= urban fabric >= industrial, commercial and transport units > forests > artificial non-agricultural areas > scrubs and/or herbaceous vegetation.

Keywords: agri-environmental measures, groundwater, nitrate, kriging, correlation