RECUPERO A FINI AGRONOMICI DI SUOLI PALUDOSO-SALMASTRI DELLA MARISMA DI LEBRIJA (SPAGNA)

Research output: Contribution to conferenceOtherpeer-review

Abstract

[automatically translated] Soil salinisation affects an area of about 830 million hectares. The main effects in cultivated areas are a gradual loss of soil fertility, resulting in decrease or loss of crops. In Spain, where more than 100 thousand hectares of irrigated land is affected by salinity and another 15% is at risk, reclamation for agricultural purposes is a common practice. The objective of this research was to investigate the changes in biomass and microbial activity in soils brackish swamp-drained and not. The study area is the Marisma of Lebrija, in the estuary of the Guadalquivir River, in the southwest of Spain. Were examined two parcels of reclaimed land (soil drainage and soil drained and ammendato) and a control plot (brackish natural soil, not hardened). On the soil samples they were determined: apparent texture, pH, electrical conductivity, soluble salts, organic C, total N, cation exchange capacity and exchangeable cations, the total limestone, C of the microbial biomass, basal CO2 and five different enzymatic activities. The reclaimed soils exhibit an electrical conductivity and a SAR lower than the non-treated soil. This is mainly due to a lower content of Na + salts in the reclaimed soils. Also the exchange of Na +, as expected, is lower in the reclaimed soils. As regards the bioindicators of soil quality, it is to be highlighted as both the C of the microbial biomass that its activities are higher in the control soil compared to those reclaimed. Also, considering the metabolic quotient, parameter that should indicate the state of stress / soil ecosystem disturbance, the reclaimed land are "more stressed". The results of this research indicate that the ecosystem study soil chemical parameters must necessarily be supplemented by biological ones, because their behavior can be quite contrasting. In fact, even if the results of the chemical analyzes suggest that the recovered soils are best, as biochemical ones it shows that the biochemical fertility is improved in the virgin marisma with the worst chemical conditions. because their behavior can be quite contrasting. In fact, even if the results of the chemical analyzes suggest that the recovered soils are best, as biochemical ones it shows that the biochemical fertility is improved in the virgin marisma with the worst chemical conditions. because their behavior can be quite contrasting. In fact, even if the results of the chemical analyzes suggest that the recovered soils are best, as biochemical ones it shows that the biochemical fertility is improved in the virgin marisma with the worst chemical conditions.
Original languageItalian
Pages164-171
Number of pages8
Publication statusPublished - 2007

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