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Indicatori microbici nei suoli calcarei, strumenti per il biomonitoraggio

Pische, Davide (2010) Indicatori microbici nei suoli calcarei, strumenti per il biomonitoraggio. Doctoral Thesis.

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Abstract

The aim of the research was to study through traditional methods of microbiology, the microbial component and some physiological groups and with the method of the Community Level Physiological Profile, heterotrophic activity and functional biodiversity of microbial communities in relation to vegetation cover and physical-chemical characteristics of calcareous soils along the flanks of Mounts Bardia and Tului (Dorgali). The sites who were sampled are 15 and samples were 2 in the spring. The results of microbiological analysis of soil showed the presence of a soil bacterial community numerically higher than fungal. Among the groups of microorganisms, the free nitrogen-fixers was the most abundant because of high values of C/N. The index of Shannon has not shown a good survey instrument for the high degree of redundancy of microbial communities. The Average Well Color Development showed that inoculate ecoplates with a too concentrated microbial suspension (105 UFC/ml) does not highlight the differences between communities, visible inoculating a less concentrated suspension (104 UFC/ml). The PCA combined with the clusters analysis showed that forest cover and overgrazing appear to be the factors most influence the soil microbial community and there seems no relationship with soil type. It’s confirmed that centrifugation is a valid technique to standardize the inoculum.

Item Type:Doctoral Thesis
ID Code:3456
Publisher:Universita' degli studi di Sassari
Uncontrolled Keywords:Comunità microbiche, suoli calcarei, biomonitoraggio, Sardegna
Subjects:Area 07 - Scienze agrarie e veterinarie > AGR/16 Microbiologia agraria
Divisions:001 Università di Sassari > 01 Dipartimenti > Protezione delle piante
Cicli, scuole e corsi:Ciclo 21 > Corsi > Monitoraggio e controllo degli ecosistemi forestali in ambiente mediterraneo
Deposited On:26 Mar 2010 12:20

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