Exploring the variation in soil saturated hydraulic conductivity under a tropical rainforest using the wavelet transform

A - Papers appearing in refereed journals

Hassler, S. K., Lark, R. M., Milne, A. E. and Elsenbeer, H. 2011. Exploring the variation in soil saturated hydraulic conductivity under a tropical rainforest using the wavelet transform. European Journal of Soil Science. 62 (6), pp. 891-901.

AuthorsHassler, S. K., Lark, R. M., Milne, A. E. and Elsenbeer, H.
Abstract

Saturated hydraulic conductivity (Ks) of the soil is a key variable in the water cycle. For the humid tropics, information about spatial scales of Ks and their relation to soil types deduced from soil map units is of interest, as soil maps are often the only available data source for modelling. We examined the influence of soil map units on the mean and variation in Ks along a transect in a tropical rainforest using undisturbed soil cores at 06 and 612 cm depth. The Ks means were estimated with a linear mixed model fitted by residual maximum likelihood (REML), and the spatial variation in Ks was investigated with the maximum overlap discrete wavelet packet transform (MODWPT). The mean values of Ks did not differ between soil map units. The best wavelet packet basis for Ks at 06 cm showed stationarity at high frequencies, suggesting uniform small-scale influences such as bioturbation. There were substantial contributions to wavelet packet variance over the range of spatial frequencies and a pronounced low frequency peak corresponding approximately to the scale of soil map units. However, in the relevant frequency intervals no significant changes in wavelet packet variance were detected. We conclude that near-surface Ks is not dominated by static, soil-inherent properties for the examined range of soils. Several indicators from the wavelet packet analysis hint at the more dominant dynamic influence of biotic processes, which should be kept in mind when modelling soil hydraulic properties on the basis of soil maps.

KeywordsSoil Science
Year of Publication2011
JournalEuropean Journal of Soil Science
Journal citation62 (6), pp. 891-901
Digital Object Identifier (DOI)doi:10.1111/j.1365-2389.2011.01400.x
Open accessPublished as non-open access
FunderDAAD - Deutscher Akademischer Austausch Dienst - German Academic Exchange Service - Germany
Panama Canal Authority (ACP)
National Environmental Authority of Panama (ANAM)
Smithsonian Tropical Research Institute (STRI)
HSBC
STRI
ACP
Frank Levinson family foundation
Motta family foundation
Biotechnology and Biological Sciences Research Council
Funder project or codeMCB
ISSN13510754
PublisherWiley

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