| Title | Changes in bacterial community structure and functioning in a degraded soil amended with organic waste |
| Abstract | Although the application of organic amendments is considered a suitable tool for improving the quality and fertility of degraded soils, few studies have been conducted in semiarid climates to evaluate the effect of such practice on the structure and function of the soil microbial communities. Organic amendments may contain heavy metals and/or other micro-contaminants and therefore affect the composition and activity of soil microorganisms. In this work, we studied the changes in the structure (abundance and diversity) and functioning (viability and dehydrogenase activity) of the microbial community in a loam soil located near Rome (Italy) after adding a cattle and/or pig compost to restore the soil. Cattle or pig compost was applied at a low (30 t/ha) or a high dose (60 t/ha) on soil samples which were maintained in microcosms for 6 months. Moreover, some soil microcosms were treated with the fertilizer NPK and others (non-treated soil) were used as controls. rosemary plants were planted in half of the entire microcosms set up (48 microcosms). Rosemary was used both for its ability to grow in semi-arid regions and because its root system is able to protect soil from erosion. At different times (0, 30, 120 and 180 days) the bacterial abundance, cell viability and dehydrogenase activity were measured in the 12 different experimental conditions. The soil organic carbon and nitrogen content together with the bacterial community diversity were also assessed at 0 and 180 days. With an increase in carbon and nitrogen soil content, in the presence of cattle and pig compost, an increase of bacterial abundance was also observed. However, the bacterial activity was significantly influenced by the presence of the rosemary, without considering the allochthonous carbon and nitrogen input. The highest values for microbial community biodiversity were found in the co-presence of the plant and a low concentration of cattle or pig compost. The use of organic amendments, which reduces the costs of their disposal as waste, together with the planting of species suited to Mediterranean semi-arid areas seem to be an appropriate strategy for improving the soil quality and restoring the ecosystem services provided by microorganisms. |
| Source | 23rd SETAC Europe Annual Meeting, Glasgow (GB), 12-16 May 2013 |
| Keywords | organic amendmentsquality and fertility of degraded soilssoil microbial communities |
| Year | 2013 |
| Type | Contributo in atti di convegno |
| Authors | Barra Caracciolo A, Bustamante M, Cinicia M, Di Lenola M, Luprano ML, I. Nogues I, Grenni P |
| Text | 226782 2013 organic amendments quality and fertility of degraded soils soil microbial communities Changes in bacterial community structure and functioning in a degraded soil amended with organic waste Barra Caracciolo A, Bustamante M, Cinicia M, Di Lenola M, Luprano ML, I. Nogues I, Grenni P irsa cnr, ibaf cnr, Dept. of Soil and Water Conservation and Organic Waste Management, CEBAS CSIC , Murcia Spain Although the application of organic amendments is considered a suitable tool for improving the quality and fertility of degraded soils, few studies have been conducted in semiarid climates to evaluate the effect of such practice on the structure and function of the soil microbial communities. Organic amendments may contain heavy metals and/or other micro contaminants and therefore affect the composition and activity of soil microorganisms. In this work, we studied the changes in the structure abundance and diversity and functioning viability and dehydrogenase activity of the microbial community in a loam soil located near Rome Italy after adding a cattle and/or pig compost to restore the soil. Cattle or pig compost was applied at a low 30 t/ha or a high dose 60 t/ha on soil samples which were maintained in microcosms for 6 months. Moreover, some soil microcosms were treated with the fertilizer NPK and others non treated soil were used as controls. rosemary plants were planted in half of the entire microcosms set up 48 microcosms . Rosemary was used both for its ability to grow in semi arid regions and because its root system is able to protect soil from erosion. At different times 0, 30, 120 and 180 days the bacterial abundance, cell viability and dehydrogenase activity were measured in the 12 different experimental conditions. The soil organic carbon and nitrogen content together with the bacterial community diversity were also assessed at 0 and 180 days. With an increase in carbon and nitrogen soil content, in the presence of cattle and pig compost, an increase of bacterial abundance was also observed. However, the bacterial activity was significantly influenced by the presence of the rosemary, without considering the allochthonous carbon and nitrogen input. The highest values for microbial community biodiversity were found in the co presence of the plant and a low concentration of cattle or pig compost. The use of organic amendments, which reduces the costs of their disposal as waste, together with the planting of species suited to Mediterranean semi arid areas seem to be an appropriate strategy for improving the soil quality and restoring the ecosystem services provided by microorganisms. Building a Better future responsible innovation and environmental protection. 23rd SETAC Europe Annual Meeting SETAC EUROPE 978 1 63266 509 6 https //c.ymcdn.com/sites/www.setac.org/resource/resmgr/Abstract_Books/SETAC Basel abstracts.pdf 23rd SETAC Europe Annual Meeting Glasgow GB 12 16 May 2013 Internazionale Contributo Abstract Book SETAC_Basel_abstracts.pdf Contributo in atti di convegno anna.barracaracciolo BARRA CARACCIOLO ANNA mariaisabel.noguesgonzalez NOGUES GONZALEZ MARIA ISABEL paola.grenni GRENNI PAOLA TA.P04.005.011 Vulnerabilita degli ecosistemi delle acque sotterranee e attenuazione naturale degli inquinanti nel suolo e nel sottosuolo |
