Análisis geoestadístico de la microtopografía de la superficie en un suelo de cultivo

Abstract

[Abstract] Depressions at the soil surface influence temporal water storage and hence runoff generation. Surface microtopography of tilled soils is subject to spatial and temporal changes. The objective of this study was to evaluate whether elevation data with different resolutions have a comparable patters of spatial dependence. Point elevation measurements were taken on 25 tilled soil surfaces after mouldboard plough across a range of cumulative precipitation and roughness. Height was measured with a pinmeter. The grid spacing of the experimental surfaces was 2 cm and sample density was diminished by leaning point out to obtain 4 cm x 4 cm and 6 cm x 2 cm grids. The spatial structure of the studied surfaces was modelled by spherical and exponential semivariograms with no o very small nugget components. Changing sample grid spacing didn’t influence the adjusted semivariogram type, but could originate small modifications of the sill and/or range values .