Staff Publications

Staff Publications

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    'Staff publications' is the digital repository of Wageningen University & Research

    'Staff publications' contains references to publications authored by Wageningen University staff from 1976 onward.

    Publications authored by the staff of the Research Institutes are available from 1995 onwards.

    Full text documents are added when available. The database is updated daily and currently holds about 240,000 items, of which 72,000 in open access.

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Record number 401187
Title A sampling strategy for estimating plot average annual fluxes of chemical elements from forest soils
Author(s) Brus, D.J.; Gruijter, J.J. de; Vries, W. de
Source Geoderma 159 (2010)3-3. - ISSN 0016-7061 - p. 399 - 408.
Department(s) SS - Soil Geography
Soil Science Centre
SS - Soil Chemistry and Nature
Publication type Refereed Article in a scientific journal
Publication year 2010
Keyword(s) regional assessment - output fluxes - ecosystems - europe
Abstract A sampling strategy for estimating spatially averaged annual element leaching fluxes from forest soils is presented and tested in three Dutch forest monitoring plots. In this method sampling locations and times (days) are selected by probability sampling. Sampling locations were selected by stratified random sampling with five blocks of equal surface area as strata. At each selected day six composite soil solution samples were collected, consisting of five aliquots of equal volume, one per stratum. For most sampling days at some locations no soil solution was collected (non-response), and as a result the average of the six composite sample concentrations (the naïve estimator) is a biased estimator of the plot mean concentration. The plot mean concentration at these days was estimated by ordinary least squares. This estimation method eliminates the bias of the naïve estimator. This estimated concentration was multiplied by the modeled water flux to obtain an estimate of the daily element leaching flux. Sampling times (days) were selected by systematic pps-sampling (sampling with probabilities proportional to size), with precipitation surplus, averaged over the past 30 years, as a measure of size. The spatially averaged annual leaching flux was estimated by the ratio-estimator, accounting for the selection probabilities of the days, using the modeled daily water flux as an auxiliary variable.
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