HR: 1340h
AN: H23A-1003    [Abstracts]
TI: Influence of different fertiliztion and cultivation on geophysical parameters
AU: * Werban, U
EM: ulrike.werban@ufz.de
AF: Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, Leipzig, 04138, Germany
AU: Kuka, K
EM: katrin.kuka@ufz.de
AF: Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, Leipzig, 04138, Germany
AU: Ines, M
EM: ines.merbach@ufz.de
AF: Helmholtz Centre for Environmental Research - UFZ, Permoserstr. 15, Leipzig, 04138, Germany
AB: Applications of geophysical methods for agricultural use increased during the last years. Since there is mostly an indirect relationship between geophysical and soil parameters, geophysical measurements within soils lead generally to ambiguous results with respect to the desired information. Our investigations were conducted at the ‚Static Experiment' Bad Lauchstaedt, which was laid out in 1902 with a major focus on examining the influence of organic and mineral fertilization on yield and quality of crops as well as on soil fertility. This site gives an excellent opportunity to study the correlations between geophysical measurements and soil parameters. The systematic design of the experiment consists of 18 fields with different management suited to investigate influence of mineral and organic fertiliztion, different developed carbon stocks and the impact of plants in terms of water availability on geophysical measurements. In our study we will present results from DC-geoelectrical measurements (profile length 80-160 m, electrode distance 0.5 m) at two different times, in August after harvest and in January. Additionally electromagnetical investigations with an EM38DD were conducted in January and extensive data sets of soil parameters (e.g., soil water content, particle sizes, carbon stocks) are available. Geophysical measurements show pattern that correlate with different fertilization. For investigation of parameter relationships a multicriterial evaluation of data sets is necessary. The analysis is performed with respect to the complex parameter dependencies; for example higher carbon content tends to a higher water storage capacity. Thus, at higher soil moisture contents a lower resistivity is measured. On the other side the surface plant growth is increased with a better supply level and the plants can take up more water. This water comes rather from the upper layers of the soil. The consequence is a higher resistivity despite higher carbon content or mineral fertiliztion. Without fertilization an increased root growth in lower soil horizons can be observed that leads to an increased water uptake in the area and consequently a higher resistivity. Hence, there is a need to look at the conditions, at the location and the management simultaneous.
DE: 1835 Hydrogeophysics
DE: 1865 Soils (0486)
DE: 1866 Soil moisture
DE: 1875 Vadose zone
SC: Hydrology [H]
MN: 2007 Fall Meeting