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Variation in soil C and microbial functions across tree canopy projection and open grassland microenvironments

Mixtures of grasslands and perennial woody crops or vineyards represent a major source of potential carbon storage or release. Understanding the spatial variability of soil properties in these ecosystems is important in determining soil constraints related to the management of soil resources. | Turkish Journal of Agriculture and Forestry http://journals.tubitak.gov.tr/agriculture/ Research Article Turk J Agric For (2014) 38: 62-69 © TÜBİTAK doi:10.3906/tar-1303-82 Variation in soil C and microbial functions across tree canopy projection and open grassland microenvironments Roberto LAI 1,2, 3 1,2 1,2 *, Alessandra LAGOMARSINO , Luigi LEDDA , Pier Paolo ROGGERO Desertification Research Centre, University of Sassari, Sassari, Italy 2 Department of Agriculture, University of Sassari, Sassari, Italy 3 Council for Research and Experimentation in Agriculture - Research Centre for Agrobiology and Soil Science (CRA-ABP), Florence, Italy 1 Received: 25.03.2013 Accepted: 09.06.2013 Published Online: 13.12.2013 Printed: 20.01.2014 Abstract: Mixtures of grasslands and perennial woody crops or vineyards represent a major source of potential carbon storage or release. Understanding the spatial variability of soil properties in these ecosystems is important in determining soil constraints related to the management of soil resources. The aims of the study were 1) to explore the spatial variability associated to the trees for soil C storage and its components and reactivity; and 2) to assess the similarities between microenvironments in terms of microbial functional diversity. Eight microenvironments characterized by different long-term soil management practices and different positions with respect to woody plant canopy soil vertical projections were selected in a Mediterranean agropastoral system. Four management types were considered: pasture, hay crop, grass-covered vineyard, and tilled vineyard. Soil organic C, microbial biomass, and respiration were measured to assess C storage and dynamics, while functional diversity was determined by means of soil enzyme activities. The results showed that the microenvironmental variation of soil organic C and functional microbial diversity generated by the tree canopies in the wooded grassland can be very relevant for