Soil sodium and potassium adsorption ratio along a Mediterranean-arid transect

P. Sarah

doi:10.1016/j.jaridenv.2004.02.007

Soil sodium and potassium adsorption ratio along a Mediterranean-arid transect

P. Sarah

Department of Environment, Planning and Sustainability

Research output: Contribution to journal › Article › peer-review

28 Scopus citations

Abstract

Changes in the relationship between soil soluble ions and rainfall were studied on hillslopes at seven research sites that represent four climatic regions: Mediterranean, semi-arid, mildly arid and arid. At each site, soil samples were taken in several seasons and the ratio between the Na⁺ plus K⁺ content and the Ca²⁺ plus Mg²⁺ content (sodium and potassium adsorption ratio=SPAR) was determined. In general, SPAR increased with increasing aridity except for the most arid site in which the soil contains a gypsic layer. The relationship between SPAR and rainfall was non-linear. An abiotic threshold, characterized by a sharp change in the SPAR, was found around the 200mm isohyet: sites that receive less than 200mm annual rainfall showed significantly higher SPAR than those that receive more than 200mm, where SPAR was very low.

Original language	English
Pages (from-to)	731-741
Number of pages	11
Journal	Journal of Arid Environments
Volume	59
Issue number	4
DOIs	https://doi.org/10.1016/j.jaridenv.2004.02.007
State	Published - Dec 2004

Bibliographical note

Funding Information:
Financial support was provided by the Israeli Ministry of Science and the Arts, GSF-Forschungszentrum fur Umwelt und Gesundheit GMBH, Neuherberg, Germany (DISUM-029) and the Commission of the European Union (research project MEDALUS III, contract ENV4-CT95-0115). I thank Dr. Jeff Herrick and the other anonymous reviewer for their enlightening and helpful comments.

Funding

Financial support was provided by the Israeli Ministry of Science and the Arts, GSF-Forschungszentrum fur Umwelt und Gesundheit GMBH, Neuherberg, Germany (DISUM-029) and the Commission of the European Union (research project MEDALUS III, contract ENV4-CT95-0115). I thank Dr. Jeff Herrick and the other anonymous reviewer for their enlightening and helpful comments.

Funders	Funder number
GSF-Forschungszentrum fur Umwelt und Gesundheit GMBH	DISUM-029
Israeli Ministry of Science and the Arts
European Commission	ENV4-CT95-0115

UN SDGs

This output contributes to the following UN Sustainable Development Goals (SDGs)

SDG 15 Life on Land

Keywords

Climatic transect
Gypsic layer
Land degradation
Potassium adsorption ratio
Sodium adsorption ratio
Soil soluble ions

Access to Document

10.1016/j.jaridenv.2004.02.007

Cite this

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title = "Soil sodium and potassium adsorption ratio along a Mediterranean-arid transect",

abstract = "Changes in the relationship between soil soluble ions and rainfall were studied on hillslopes at seven research sites that represent four climatic regions: Mediterranean, semi-arid, mildly arid and arid. At each site, soil samples were taken in several seasons and the ratio between the Na+ plus K+ content and the Ca2+ plus Mg2+ content (sodium and potassium adsorption ratio=SPAR) was determined. In general, SPAR increased with increasing aridity except for the most arid site in which the soil contains a gypsic layer. The relationship between SPAR and rainfall was non-linear. An abiotic threshold, characterized by a sharp change in the SPAR, was found around the 200mm isohyet: sites that receive less than 200mm annual rainfall showed significantly higher SPAR than those that receive more than 200mm, where SPAR was very low.",

keywords = "Climatic transect, Gypsic layer, Land degradation, Potassium adsorption ratio, Sodium adsorption ratio, Soil soluble ions",

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N2 - Changes in the relationship between soil soluble ions and rainfall were studied on hillslopes at seven research sites that represent four climatic regions: Mediterranean, semi-arid, mildly arid and arid. At each site, soil samples were taken in several seasons and the ratio between the Na+ plus K+ content and the Ca2+ plus Mg2+ content (sodium and potassium adsorption ratio=SPAR) was determined. In general, SPAR increased with increasing aridity except for the most arid site in which the soil contains a gypsic layer. The relationship between SPAR and rainfall was non-linear. An abiotic threshold, characterized by a sharp change in the SPAR, was found around the 200mm isohyet: sites that receive less than 200mm annual rainfall showed significantly higher SPAR than those that receive more than 200mm, where SPAR was very low.

AB - Changes in the relationship between soil soluble ions and rainfall were studied on hillslopes at seven research sites that represent four climatic regions: Mediterranean, semi-arid, mildly arid and arid. At each site, soil samples were taken in several seasons and the ratio between the Na+ plus K+ content and the Ca2+ plus Mg2+ content (sodium and potassium adsorption ratio=SPAR) was determined. In general, SPAR increased with increasing aridity except for the most arid site in which the soil contains a gypsic layer. The relationship between SPAR and rainfall was non-linear. An abiotic threshold, characterized by a sharp change in the SPAR, was found around the 200mm isohyet: sites that receive less than 200mm annual rainfall showed significantly higher SPAR than those that receive more than 200mm, where SPAR was very low.

KW - Climatic transect

KW - Gypsic layer

KW - Land degradation

KW - Potassium adsorption ratio

KW - Sodium adsorption ratio

KW - Soil soluble ions

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ER -

Soil sodium and potassium adsorption ratio along a Mediterranean-arid transect

Abstract

Bibliographical note

Funding

UN SDGs

Keywords

Access to Document

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Cite this