Studies on the nitrogen transforms in the some plant communities of the alpine and sub-alpine belts in Murat Mountain (Uşak, Kütahya)


Thesis Type: Doctorate

Institution Of The Thesis: Uludağ Üniversitesi, Turkey

Approval Date: 2007

Thesis Language: Turkish

Student: MEHMET CÜNEYT ÜNVER

Supervisor: GÜRCAN GÜLERYÜZ

Abstract:

Murat (Didymus) Mountain is endowed with a rich flora containing numerous endemic species and forming several well-distinguished vegetation types. For this reason, the mount is one of the 122 Important Plant Areas (IPAs) of Turkey (Murat Mountain, IPA 38). Nitrogen mineralization was investigated in the soil of the dwarf shrub (Juniperus communis), mat (Plantago holosteum) and grassland (Alyssum virgatum) communities with serpentine substratum in the alpine and sub-alpine belts of Murat Mountain. The N mineralization and annual net production in two soil depths (0-5 and 5-15 cm) of three communities were measured with a field incubation technique. Simple correlation analyses were performed between net N-mineralization and soil properties (soil moisture, pH, Organic C, total N, Water Holding Capacity, C/N rate). The significant seasonal fluctuation of net mineral nitrogen was found (P<0.05). Significant differences were detected in annual N mineralization rates (in the 0-15 cm depth of soils) among three communities (P<0.05). Annual net mineral nitrogen yield in the soils of Plantago mat community, Juniperus dwarf shrub community and Alyssum grassland community was 59 kg / ha / y-1, 53 kg / ha / y-1 and 43 kg / ha / y-1, respectively. Soil moisture was limited on N mineralization. Significant positive correlation between Net N mineralization and/or nitrification and soil moisture was found (P<0.05). However, the correlation between the soil organic C and net N mineralization and nitrification rates was a negative significantly (P<0.05).