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WoSIS latest - Effective cation exchange capacity - ISRIC

Capacity of the fine earth fraction* to hold exchangeable cations at the pH of the soil (ECEC). Conventionally approximated by summation of exchangeable bases (Ca2+, Mg2+, K+, and Na+) plus 1 N KCl exchangeable acidity (Al3+ and H+) in acidic soils (cmol(c)/kg).

ISRIC is developing a centralized and user–focused server database, known as ISRIC World Soil Information Service (WoSIS). The aims are to:

• Safeguard world soil data "as is"

• Share soil data (point, polygon, grid) upon their standardization and harmonization

• Provide quality-assessed input for a growing range of environmental applications.

So far some 400,000 profiles have been imported into WoSIS from disparate soil databases; some 150,000 of have been standardised. The number of measured data for each property varies between profiles and with depth, generally depending on the purpose of the initial studies. Further, in most source data sets, there are fewer data for soil physical as opposed to soil chemical attributes and there are fewer measurements for deeper than for superficial horizons. Generally, limited quality information is associated with the various source data.

Special attention has been paid to the standardization of soil analytical method descriptions with focus on the set of soil properties considered in the GlobalSoilMap specifications. Newly developed procedures for the above, that consider the soil property, analytical method and unit of measurement, have been applied to the present set of geo-referenced soil profile data.

Gradually, the quality assessed and harmonized "shared" data will be made available to the international community through several webservices. All data managed in WoSIS are handled in conformance with ISRICs data use and citation policy, respecting inherited restrictions.

The most recent set of standardized attributes derived from WoSIS are available via WFS. For instructions see Procedures manual 2018, Appendix A, link below (Procedures manual 2018).

* The fine earth fraction is generally defined as being less than 2 mm. However, an upper limit of 1 mm was used in the former Soviet Union and its sattelite states (Katchynsky scheme). This has been indicated in the database.

Simple

Date ( Publication )
2020-05-01
Identifier
3ed0d2a2-8822-421b-8e89-a7f3bb8a973a
Presentation form
Digital map
Status
On going
Author
  ISRIC - World Soil Information - Ad van Oostrum ( Guest researcher )
PO Box 353 , Wageningen , 6700AJ , Netherlands
Point of contact
  ISRIC - World Soil Information - Ulan Turdukulov
Author
  ISRIC - World Soil Information - Niels Batjes ( Senior Soil Scientist )
PO Box 353 , Wageningen , 6700AJ , Netherlands
Keywords ( Theme )
  • effective cation exchange capacity
  • soil profiles
Stratum ( Stratum )
  • Soil science
Region ( Place )
  • Global
Access constraints
License
Use constraints
License
Other constraints
Licenced per profile, as specified by data provider and indicated in the data
Spatial representation type
Vector
Denominator
100000
Metadata language
en
Character set
UTF8
Topic category
  • Geoscientific information
Begin date
1918-01-01
End date
2013-02-12
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W
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Reference system identifier
EPSG / 4326
Distribution format
  • CSV ( )

OnLine resource
wosis_latest_ecec ( OGC:WFS )
OnLine resource
Scientific paper ( WWW:LINK-1.0-http--related )
OnLine resource
Project webpage ( WWW:LINK-1.0-http--related )
OnLine resource
Procedures manual 2018 ( WWW:LINK-1.0-http--related )
Hierarchy level
Dataset
Statement
https://www.isric.org/explore/wosis/wosis-contributing-institutions-and-experts
File identifier
3ed0d2a2-8822-421b-8e89-a7f3bb8a973a XML
Metadata language
en
Character set
UTF8
Hierarchy level
Dataset
Hierarchy level name
dataset
Date stamp
2021-02-01T10:07:52
Metadata standard name
ISO 19115:2003/19139
Metadata standard version
2003/Cor.1:2006
Point of contact
  ISRIC - World Soil Information - Ulan Turdukulov
 
 

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Spatial extent

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Keywords

effective cation exchange capacity soil profiles

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