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    Arazi kullanımının sulak alandan tarıma dönüştürülmesinin bazı toprak özellikleri üzerindeki etkileri ve bunların toprak derinliği ile değişimi
    (2022) Korkanç, Selma Yaşar; Korkanç, Mustafa; Mert, Muhammet Hüseyin; Geçili, Abdurrahman; Serengil, Yusuf
    Dünyada sulak alan ekosistemlerini etkileyen en önemli insan müdahalelerinden biri arazi kullanımının değiştirilmesidir. Bu çalışmanın amacı, Sultan Sazlığı örneğinde sulak alandan tarıma dönüştürmenin sulak alan ve civarı topraklarda organik karbon ve bazı toprak özellikleri üzerindeki etkilerini ortaya koymaktır. Bu amaçla sulak alan ekosisteminde bulunan sazlık (Örtülüakar ve Kepir Sazlıkları) ve tarıma dönüştürülmüş alanlardan doğal yapısı bozulmamış toprak örneklemesi yapılmış (0-40 cm) ve 10 ar cm’ lik derinlik kademesine ayrılarak her bir derinlik kademesindeki organik karbon miktarı (TOK) ile hacim ağırlığı belirlenmiş ve karbon depolama kapasiteleri hesaplanmıştır. Ayrıca her bir arazi kullanım şeklinden iki derinlik kademesinden (0-20 cm ve 20-40 cm) alınan toprak örneklerinin toprak tekstürü, pH, elektriksel iletkenlik (EC), ateşte kayıp, agregat stabilitesi özellikleri belirlenmiştir. Tarıma dönüştürme Sultan Sazlığı ekosistemindeki çeşitli toprak özelliklerini etkilemiştir. Arazi kullanımı dönüşümlerinden etkilenen toprak özellikleri; organik karbon, karbon depolama kapasitesi, agregat stabilitesi, kum, kil, toz içeriği, hacim ağırlığı, ateşte kayıptır. Toprak derinliği değişiminden etkilenen toprak özellikleri ise organik karbon, karbon depolama kapasitesi, pH, kil, kum içeriği ve hacim ağırlığıdır.
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    Effects of Land-Use Change on the Soil Organic Carbon and Selected Soil Properties in the Sultan Marshes, Turkey
    (Springer, 2022) Korkanc, Selma Yasar; Korkanc, Mustafa; Mert, Muhammet Huseyin; Gecili, Abdurrahman; Serengil, Yusuf
    This study aims to assess the effects of land-use changes on the carbon storage capacity and some soil properties of The Sultan Marshes, a wetland partially drained and converted to other land uses during the middle of the last century. Undisturbed soil sampling was performed in different land-use types (rangelands, shrubs, marsh, agriculture, and dried lake area) in the wetland area at depths of 0-50 cm, and soil organic carbon (SOC), bulk density, and carbon stocks of soils for each land use type were calculated at 10 cm soil depth levels. Furthermore, disturbed soil samples were taken at two soil depths (0-20 cm and 20-40 cm), and the particle size distribution, pH, electrical conductivity (EC), aggregate stability and dispersion ratio (DR) properties of the soils were analyzed. Data were processed using ANOVA, Duncan's test, and Pearson's correlation analysis. The soil properties affected by the land-use change were SOC, carbon stock, pH, EC, aggregate stability, clay, silt, sand contents, and bulk density. SOC and carbon stocks were high in rangeland, marsh, and shrub land, while low in agriculture and drained lake areas. As the soil depth increased, SOC and carbon stock decreased. The organic carbon content of the soils exhibited positive relationships with aggregate stability, clay, and carbon stock, while it showed a negative correlation with bulk density, pH, and DR. The results showed that s drainage and conversion of the wetland caused a significant decrease in the carbon contents of the soils.
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    Effects of litter layer on some exchangeable cations in Belgrad Forest, Turkey
    (PARLAR SCIENTIFIC PUBLICATIONS (P S P), 2008) Korkanc, Selma Yasar; Serengil, Yusuf
    The paper presents a synthesis of a set of experiments, implemented to investigate the acid buffering mechanism of Belgrad Forest soils. Previous studies carried out in the region, pointed out the exposure of Belgrad Forest ecosystems to acid deposition. Between 1999 and 2001, we performed a set of supplementary studies, focusing on the hydrogen buffering, part of the issue. Ceramic cup lysimeters were installed to various soil depths, and the soil water ionic composition was monitored to determine the main buffering, zones among the horizons. The upper 20 cm, litter layer and Ah horizon, were identified to have the main exchange mechanisms, decreasing the hydrogen ion activity from 22.82 mu eq L-1 to 0.56 mu eq L-1. To identify the role of litter layer, a litter removal parcel study was employed. After the litter removal, soil samples were taken bimonthly from two depths (0-12 and 12-20 cm) for a 1-year period of time, to determine changes in soil properties. Organic matter content and pH were slightly higher in the upper 12 cm. Finally, the exchange capacities of single-valenced base cations, Na+ and K+ were compared with a retention curve experiment in laboratory. The cation retention capacities of the soil samples rich in organic matter were lower than the ones with less organic matter. The results of the three experiments revealed that, even though the upper soil horizons were responsible of hydrogen buffering in the region, the litter layer or humus layer did not have a particular role.