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Use of BEST Procedure to assess soil physical quality in the Baratz Lake catchment (Sardinia, Italy)

Castellini, Mirko and Iovino, Massimo and Pirastru, Mario and Niedda, Marcello and Bagarello, Vincenzo (2016) Use of BEST Procedure to assess soil physical quality in the Baratz Lake catchment (Sardinia, Italy). Soil Science Society of America Journal, Vol. 80 (3), p. 742-755. ISSN 0361-5995. eISSN 1435-0661. Article.

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DOI: 10.2136/sssaj2015.11.0389

Abstract

Conversion of Mediterranean maquis and/or natural forest into agro-pastoral lands is a cause of soil degradation in many Mediterranean areas. Indicators of soil physical quality (SPQ) quantitatively linked to soil hydraulic properties are a valuable tool to assess the effect of land use changes. In this investigation, the Beerkan Estimation of Soil Transfer parameters (BEST) procedure for soil hydraulic characterization was used to estimate SPQ indicators. Four areas of the Baratz Lake watershed, Sardinia, Italy, characterized by both typical natural vegetation (holm oak [Quercus ilex L.] forest and high maquis) and degraded vegetation (grassland established after fire or clearing of the maquis) were considered. The SPQ was assessed by either independently measured soil physical attributes, like soil bulk density, organic C content, saturated hydraulic conductivity, and sorptivity, and “capacitive” and “dynamic” indicators calculated from the water retention curve estimated by the BEST procedure. Measured and estimated SPQ indicators unanimously showed that clearing of the maquis caused a severe deterioration of SPQ associated with soil compaction, organic matter loss, and decrease of macropore volume and soil aeration capacity as well as reduced water circulation. A different and unexpected result was obtained for the fire-affected area, where the SPQ was comparable to that of the neighboring oak forest area. We deduced that vegetation restoration after fire passage contributed to maintain a high organic matter content and to mitigate rain compaction effects. We concluded that SPQ indicators derived by applying the BEST procedure are suitable to detect land degradation in the natural environments studied.

Item Type:Article
ID Code:11462
Status:Published
Refereed:Yes
Uncontrolled Keywords:Soil physical quality (SPQ), Baratz Lake watershed, Sardinia
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/08 Idraulica agraria e sistemazioni idraulico-forestali
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Soil Science Society of America
ISSN:0361-5995
eISSN:1435-0661
Deposited On:19 Oct 2016 16:15

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