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 534079
Title How serious a problem is subsoil compaction in the Netherlands? A survey based on probability sampling
Author(s) Brus, Dick J.; Akker, Jan J.H. Van Den
Source Soil 4 (2018)1. - ISSN 2199-3971 - p. 37 - 45.
Department(s) Biometris (WU MAT)
Alterra - Soil, water and land use
Publication type Refereed Article in a scientific journal
Publication year 2018
Abstract Although soil compaction is widely recognized as a soil threat to soil resources, reliable estimates of the acreage of overcompacted soil and of the level of soil compaction parameters are not available. In the Netherlands data on subsoil compaction were collected at 128 locations selected by stratified random sampling. A map showing the risk of subsoil compaction in five classes was used for stratification. Measurements of bulk density, porosity, clay content and organic matter content were used to compute the relative bulk density and relative porosity, both expressed as a fraction of a threshold value. A subsoil was classified as overcompacted if either the relative bulk density exceeded 1 or the relative porosity was below 1. The sample data were used to estimate the means of the two subsoil compaction parameters and the overcompacted areal fraction. The estimated global means of relative bulk density and relative porosity were 0.946 and 1.090, respectively. The estimated areal fraction of the Netherlands with overcompacted subsoils was 43 %. The estimates per risk map unit showed two groups of map units: A "low-risk " group (units 1 and 2, covering only 4.6%of the total area) and a "high-risk" group (units 3, 4 and 5). The estimated areal fraction of overcompacted subsoil was 0% in the lowrisk unit and 47% in the high-risk unit. The map contains no information about where overcompacted subsoils occur. This was caused by the poor association of the risk map units 3, 4 and 5 with the subsoil compaction parameters and subsoil overcompaction. This can be explained by the lack of time for recuperation.
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