Ortiz O., Alcañiz J.M. (2006) Bioaccumulation of heavy metals in Dactylis glomerata L. growing in a calcareous soil amended with sewage sludge. Bioresource Technology. 97: 545-552.EnllaçDoi: 10.1016/j.biortech.2005.04.014
The total and DTPA-extractable concentrations of Pb, Ni, Zn, Cu, Cr and Cd were measured in a calcareous soil amended with different doses of sewage sludge under field conditions. The same metals were also measured in the roots and leaves of Dactylis glomerata at the end of the first vegetative period after the sludge was added. The root concentrations of all the metals were unrelated to their concentrations in the soil. Leaf concentrations of Zn and Cr correlated with total (Zn) and DTPA-extractable (Zn and Cr) concentrations in the soil. DTPA extraction did not appear to be very useful for evaluating the bioavailability of metals in this kind of soil as it gave very low correlation coefficients with leaf content (r = 0.684, P = 0.0049 for Zn and r = 0.557, P = 0.0249 for Cr). Concentrations of Pb, Ni, Cu, and Cd in roots and leaves of Dactylis glomerata were unrelated to the total or DTPA-extractable concentrations in the sludge-amended soil. © 2005 Elsevier Ltd. 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.
Ojeda G., Alcaniz J.M., Ortiz O. (2003) Runoff and losses by erosion in soils amended with sewage sludge. Land Degradation and Development. 14: 563-573.EnllaçDoi: 10.1002/ldr.580
In order to promote the transformation of a burnt Mediterranean forest area into a dehesa system, 10 t ha-1 of dry matter of the same sewage sludge in three different forms: fresh, composted and thermally-dried, were added superficially to field plots of loam and sandy soils located on a 16 per cent slope. This application is equivalent to 13·8 t ha-1 of composted sludge, 50 t ha-1 of fresh sludge and 11·3 t ha-1 of thermally-dried sludge. The surface addition of a single application of thermally-dried sludge resulted in a decrease in runoff and erosion in both kinds of soil. Runoff in thermally-dried sludge plots was lower than in the control treatment (32 per cent for the loam soil and 26 per cent for the sandy soil). The addition of any type of sludge to both soil types also reduces sediment production. Significant differences between the control and sludge treatments indicate that the rapid development of plant cover and the direct protective effect of sludge on the soil are the main agents that influence soil erosion rates. Results suggest that the surface application of thermally-dried sludge is the most efficient way to enhance soil infiltration. Copyright © 2003 John Wiley and Sons, Ltd.
Barrera I., Andrés P., Alcañiz J.M. (2001) Sewage sludge application on soil: Effects on two earthworm species. Water, Air, and Soil Pollution. 129: 319-332.EnllaçDoi: 10.1023/A:1010335816237
Some biological effects of soil fertilisation with sewage sludge were investigated after soil reclamation in an opencast mining area. Two earthworm species (Allolobophora chlorotica chlorotica and Nicodrilus caliginosus meridionalis) inhabiting the reclaimed soil were tested for their response to two high doses of sludge (75 and 150 g kg-1 of dry sludge in dry sieved soil). The metal concentrations in the sludge amended soils were below that which worm mortality would be expected. Mean annual density of the earthworms was higher in the plots where the sludge was applied (435 and 335 ind. m-2) than in control (115 ind. m-2). We verified the accumulation of Cd and Zn by the two earthworm species at any dose of sludge, and metal accumulation was higher in N. caliginosus than in A. chlorotica. Zn, Pb, Cr, Cu and Ni were more concentrated in the earthworm egesta than in the bulk soil.
Sort X, Alcañiz JM (2001) Application of X-ray microanalysis to study the distribution of organic waste in soil. Geoderma 104:1-15.
Alcañiz JM, Romera JA, Comellas L, Munné R, Puigbó A (1989) Effects of some mineral matrices on flash pyrolysis-GC of soil humic substances. The Science of the Total Environment 81/82:88-90.
Sort X, Alcañiz JM (1999) Effects of sewage sludge amendment on soil aggregation. Land Degradation & Development 10:3-12.
Badia D, Alcañiz JM (1997) Short term changes in humic substances from different semiarid agricultural soils: optical density characterization. Agr. Med. 127:1-11.
Badia D, Alcañiz JM (1996) Response to NH4+-N fertilization of Xeric Torriorthent soils from middle Ebro Basin (Spain). Fertilizer Research 43:217-221.
Sort X, Alcañiz JM (1996) Contribution of sewage sludge to erosion control in the rehabilitation of limestone quarries. Land Degradation & Development 7:69-76.
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