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Influence of land use on soil quality and stratification ratios under agro-silvo-pastoral Mediterranean management systems

Francaviglia, Rosa and Benedetti, Anna and Doro, Luca and Madrau, Salvatore and Ledda, Luigi (2014) Influence of land use on soil quality and stratification ratios under agro-silvo-pastoral Mediterranean management systems. Agriculture Ecosystems and Environment, Vol. 183 , p. 86-92. ISSN 0167-8809. eISSN 1873-2305. Article.

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DOI: 10.1016/j.agee.2013.10.026

Abstract

A case study from north-eastern Sardinia (Italy) in semiarid conditions is presented. Agriculture is mainly extensive and markedly agro-silvo-pastoral, and is typical of similar areas of the Mediterranean basin. The following land uses at different levels of crop intensification were considered: tilled vineyard (TV), no-tilled grassed vineyard (GV), hay crop and pasture with sparse cork oaks (HC and PA), semi-natural systems (SN, former vineyards set-aside about 30 years ago), cork oak forest (Quercus suber L.) established in the past century (CO). Some soil quality parameters were considered: soil organic carbon (SOC) and total N (TN) concentrations, stocks and their stratification ratios with depth (SRs), microbial biomass carbon (MBC) and its quotient to SOC (qmic), and C:N ratios.
Both in terms of concentrations and stocks, SOC and TN were generally higher in HC, PA, CO and SN: in these land uses SOC in the topsoil were in the range 17.0–24.3 g kg−1 and 48.9–65.4 t ha−1; TN values were 1.07–2.08 g kg−1 and 3.1–6.0 t ha−1.
SOC and TN SRs under the CO land use were higher than 4, quite above the proposed threshold (≫2), >2 in GV, and ≥2.0 in PA.
MBC in mg kg−1 and qmic in μg g−1 were higher under CO (194 and 0.89) and GV (156 and 0.97).
C:N ratios had optimum or nearly optimum (9–12) values in CO, PA and the GV, in agreement with the SRs, MBC and qmic. A positive and significant correlation was found between SOC and TN concentrations in all the land uses.

Item Type:Article
ID Code:9814
Status:Published
Refereed:Yes
Uncontrolled Keywords:Mediterranean systems, soil organic carbon, total N, stratification ratio, C:N, microbial biomass, microbial quotient
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/14 Pedologia
Area 07 - Scienze agrarie e veterinarie > AGR/02 Agronomia e coltivazioni erbacee
Divisions:001 Università di Sassari > 01-a Nuovi Dipartimenti dal 2012 > Agraria
Publisher:Elsevier
ISSN:0167-8809
eISSN:1873-2305
Copyright Holders:© 2013 Elsevier B.V. All rights reserved
Deposited On:20 May 2014 11:07

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