A case study from north-eastern Sardinia (Italy) in semiarid conditions is presented. Agriculture is mainlyextensive 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-naturalsystems (SN, former vineyards set-aside about 30 years ago), cork oak forest (Quercus suber L.) establishedin the past century (CO). Some soil quality parameters were considered: soil organic carbon (SOC) andtotal N (TN) concentrations, stocks and their stratification ratios with depth (SRs), microbial biomasscarbon (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−1and 48.9–65.4 t ha−1; TN valueswere 1.07–2.08 g kg−1and 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−1and qmic in micro g g−1were 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 theSRs, MBC and qmic. A positive and significant correlation was found between SOC and TN concentrationsin all the land uses.
|Autori:||Francaviglia, R.;Benedetti, A.;Doro, L.;Madrau, S.;Ledda, L.|
|Data di pubblicazione:||2014|
|Titolo:||Influence of land use on soil quality and stratification ratios underagro-silvo-pastoral Mediterranean management systems|
|Rivista:||AGRICULTURE, ECOSYSTEMS & ENVIRONMENT|
|Appare nelle tipologie:||1.1 Articolo in rivista|