Contents
- Part A: methodology for determining the number and location of sampling points and for the sampling survey
- Part B: methodology for determining or estimating the values of soil descriptors
- Part C: minimum methodological criteria for determining the values of the soil sealing and soil removal indicators
Activity | Minimum criteria for methodology1.Determination of sampling points (sampling survey) for soil health assessment | The sampling survey shall be designed from a complete sample frame containing the best available information on the distribution of soil properties, such as information resulting from relevant measurements pursuant to Article 9(3) and (4)The sampling scheme shall be a stratified random sampling optimised on the best available information on the variability of soil descriptors, and the stratification shall be based on the soil units established in accordance with Article 4(2). Sampling points related to measurements referred to in Article 9(4) may be taken into account partly or completely in the sampling scheme, regardless of their designThe number and location of the sampling points shall represent the variability of the chosen soil descriptors within the soil units, with a maximum error percentage (or coefficient of variation) of 5 %The allocation and size of the sample shall be determined by applying appropriate procedures (e.g. the Bethel algorithm – Bethel, 1989) which are able to account for the required maximum estimation errorThe sampling survey designed by the Member States for each monitoring cycle may change or remain the sameFurther details on determining the number and location of sampling points are to be provided pursuant to Article 24(1), point (a)2.Field sampling survey | Exact sampling locations shall be sampled unless duly justified circumstances, such as soil saturated with water or a high level of rock content, prevent the sampling of the locationsWhen soil composite samples are taken, they shall be a mixture of at least 5 subsamplesWhen sampling soil in non-forested areas, residues and organic debris shall be removed from the surfaceWhen sampling soil in forested areas, the forest floor, if relevant subdivided into litter and organic layers, shall be sampled separately and the thickness and weight shall be recordedSamples or subsamples for the composite sample shall, where possible, be taken to a depth of at least 30 cm of soil. Information such as soil type and if possible genetic soil horizons shall be recorded. Subsamples shall be mixed together in order to get a homogeneous composite sample. Sampling may be done by fixed depth or by horizon, but data shall be reported by fixed depthBulk density samples shall be undisturbed samples taken at the relevant depth, including below 30 cm for subsoil. Samples related to soil compaction (saturated hydraulic conductivity and air capacity) may be the same undisturbed samples as those taken for bulk density. Where high content of coarse fragments in soil prevents sample taking, sampling may be excluded in that location for measuring bulk densityFurther details on the field sampling survey are to be provided pursuant to Article 24(1), point (a), including on how to handle specific situations such as shallow soils and different sampling depths
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