Eugenio M., Lloret F., Alcañiz J.M. (2006) Regional patterns of fire recurrence effects on calcareous soils of Mediterranean Pinus halepensis communities. Forest Ecology and Management. 221: 313-318.EnllaçDoi: 10.1016/j.foreco.2005.10.011
The effects of fire recurrence on soils were studied on calcareous sites of Mediterranean Pinus halepensis-dominated communities in Catalonia (NE Iberian Peninsula). Soil organic horizons and mineral soils of 15 sites consisting in two adjacent areas, one burnt only once (in 1994) and the other burnt twice (in the same 1994 fire but also once before, from 1975 to 1993) were surveyed 9 years after the last fire. Fire recurrence decreased the occurrence and dry mass of soil organic horizons. Total nitrogen concentration in L organic horizon was higher in less recurrently burnt areas. No other significant difference between once- and twice-burnt areas was found for any studied chemical parameter either in organic L and FH horizons or in mineral soils. The present study underlines the fact that fire effects on soil organic horizons are accumulated through consecutive fires. © 2005 Elsevier B.V. All rights reserved.
Moreno-Peñaranda R., Lloret F., Alcañiz J.M. (2004) Effects of sewage sludge on plant community composition in restored limestone quarries. Restoration Ecology. 12: 290-296.EnllaçDoi: 10.1111/j.1061-2971.2004.00310.x
The effects of sewage sludge, used to improve fertility of replaced soil, on vegetation were studied in limestone quarry restoration. Plant community growing in the first stages after sludge application was surveyed in six quarries of NE Spain. Areas with a mixture of sewage sludge and residual soil were compared to areas where the application consisted only of residual soil (a mixture of previous top soil and mine spoils). Sewage sludge was hypothesized to increase total biomass and cover, modifying species composition and delaying the early successional recover of the community. The results showed that both biomass and plant cover increased because of sewage sludge addition. The floristic composition was dominated by ruderal species that did not show any dependence on sewage sludge application. Convergence on similarity between sludge and control plots was not detected along a 5-year period. Although species richness was significantly lower in sludge plots, diversity and equitability indexes did not show differences between treatments. The results did not show differences in the proportion of non-native species. The proportion of legumes was lower in sludge plots. These results show that the plant communities resulting from the addition of sewage sludge to the soil used in limestone quarry restoration have more biomass and cover, but less number of species, and they do not show a clear trend to converge to those areas restored only with non-amended soil. © 2004 Society for Ecological Restoration International.
Alcañiz JM, García X, Lloret F (1998) Banc de llavors i densitat de plàntules en sòls restaurats amb fang de depuradora. Orsis 13:91-104.
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