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Gewählte Doctoral Thesis:

Yoseph Tewodros Delelegn (2021): LAND USE CHANGE EFFECTS ON SOIL QUALITY IN RELATION TO MICROBIAL COMMUNITY STRUCTURE AND FUNCTION.
Doctoral Thesis - Institut für Waldökologie (IFE), BOKU-Universität für Bodenkultur, pp 119. UB BOKU obvsg

Data Source: ZID Abstracts
Abstract:
Context: Ethiopia has undergone a significant land use change during the past centuries, particularly deforestation. However, we know very little about how these changes of land use types modulate the soil attributes, shape the soil microbiome and their functional diversity, and factors corresponding to the shift in soil microbial community compositions. Aims: Investigating the effect of land use types on soil quality, aggregate stability, soil microbiomes, and their functions, and determining the factors correlated with microbial community compositions. Methods: The study was conducted on the soils from five land uses types taking the natural forest as reference. Soil quality indicators, including soil biochemical and aggregate stabilities, were analyzed to determine the land use effect on soil quality. To determine the soil bacterial and fungal richness, community composition, and functional diversity, I applied the paired-end Illumina high throughput sequencing approach. Results: Conversion of natural forest to cropland results in a decline of soil quality and aggregate stability, whereas application of exclosure and afforestation on degraded lands restore soil quality and aggregate stability. Overall, the fungal community composition was affected by the alteration of vegetation cover, whereas the bacterial communities were mainly sensitive to changes in soil attributes. The land use change led to the recruitment of new microbial functional groups in cropland and grassland; and a unique ectomycorrhiza and ericoid mycorrhiza fungi in eucalyptus plantations. Exclosure led to the restoration of native soil microbial communities, implying its potential role in recovering the soil health, microbial biodiversity, and related ecosystem functions. Conclusion: Uncontrolled land use change significantly affects soil quality, microbial community structure, and ecosystem functions. However, exclosure can be used as one of the cheapest ecosystem restoration mechanisms.

Betreuer: Godbold Douglas L.
1. Berater: Katzensteiner Klaus

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