Studies on nitrogen transforms in soil of Verbascum olympicum plant community growing on the disturbance sites in the subalpine and alpine belt of Uludağ


Thesis Type: Postgraduate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2004

Thesis Language: Turkish

Student: ELİF TİTREK

Supervisor: GÜRCAN GÜLERYÜZ

Abstract:

Verbascum olympicum Boiss. is one of the pioneer species spreads on destroyed sites on alpine and subalpine belt in Uludağ National Park, Bursa. Rehder et al (1994) reported that this species dominant on the destroyed sites around the tourism development centers, roadsides and on the abandoned sheep folds and they reported that V. olympicum-commumty represents the ruderal vegetation type on these areas. In this study, N mineralization and annual net productivity in two soil depths (0-5 and 5-15 cm) of V. olympicum-commumty were examined with field work. The significant seasonal fluctuation of net mineral nitrogen was found. Annual production of N-mineralization was 96.5 1± 33.04 kg/ha in the 0-15 cm depth of soils. Simple correlation analyses were performed between net N-mineralization and environmental factors such as soil moisture, pH, Organic C, total N, Water Holding Capacity (WHC), C/N rates. Net mineral nitrogen productivity in the soil of V. olympiaim-commumty was compared to that of other communities in this area. It was higher than that of Festuca- hard cushion, Juniperus- dwarf shrub and Nardus-meadow plant communities. Our results indicate that nitrogen mineralization in alpine and subalpine belt of Uludağ increased in the first stage of secondary succession following anthropogenic disturbances.