The Effect of Land Use and Land Cover on Soil Organic Carbon Stock in Relation to Some Soil Properties

Öz

Identifying the primary factors influencing spatial distribution of soil organic carbon (SOC) stock is critical for improving the accuracy of soil organic carbon stock estimation. The primary objective of the current study is to determine the effects of land use-land cover, and some soil characteristics on SOC stock in an area of 111 km2 in Vezirköprü district, Samsun province in the Central Black Sea Region of Turkey. To determine land use and land cover of the study area, Triplesat satellite image was used. Four main land use and land cover that are forest, pasture, settlement, and cultivated land were determined. According to the results obtained, it was determined that some soil characteristics and land use-land cover in the study area had a statistically significant effect on the spatial variation of SOC density. The amount of SOC stock in the study area varies between 4.79- and 94.10-tons ha-1 in surface (0-20 cm) soils and between 5.16- and 8.86-tons ha-1 in subsurface (20-40 cm) soils. Among the different land uses, it was determined that the highest amount of SOC stock in the surface soil was 53.356 tons ha-1 in forest areas, while the lowest amount of SOC stock was in agricultural lands with 34.048 tons ha-1.

Anahtar Kelimeler

• Soil organic carbon
• land use
• land cover
• soil physico-chemical properties
• Vezirköprü

Bazı Toprak Özellikleri İle İlişkili Olarak Arazi Kullanımı ve Arazi Örtüsünün Toprak Organik Karbon Stokuna Etkisi

Öz

Toprak organik karbon (TOK) stokunun mekânsal dağılımını etkileyen temel faktörlerin belirlenmesi, TOK stok tahminlerinin doğruluğunu artırmak için kritik öneme sahiptir. Bu çalışmanın temel amacı, Türkiye’nin Orta Karadeniz Bölgesi’nde yer alan Samsun ilinin Vezirköprü ilçesinin 111 km2’lik kısmını kaplayan alanda arazi kullanımı-arazi örtüsü ile bazı toprak özelliklerinin TOK stoku üzerindeki etkilerini belirlemektir. Çalışma alanının arazi kullanımını ve arazi örtüsünü belirlemek için Triplesat uydu görüntüsü kullanılmıştır. Orman, mera, yerleşim ve tarım arazileri olmak üzere dört ana arazi kullanımı ve arazi örtüsü belirlenmiştir. Elde edilen sonuçlara göre, çalışma alanında bazı toprak özelliklerinin ve arazi kullanımının-arazi örtüsünün TOK yoğunluğunun mekânsal değişimini istatistiksel olarak önemli düzeyde etkilediği saptanmıştır. Çalışma alanında TOK stok miktarı yüzey (0-20 cm) topraklarında 4.79 ton ha-1 ile 94.10 ton ha-1 arasında, yüzey altı (20-40 cm) topraklarda ise 5.16 ton ha-1 ile 8.86 ton ha-1 arasında değişmektedir. Farklı arazi kullanımları arasında en yüksek TOK stoku miktarının yüzey toprağında 53.356 ton ha-1 ile ormanlık alanlarda iken, en düşük TOK stoku miktarının ise 34.048 ton ha-1 ile tarım arazilerinde olduğu belirlenmiştir.

Anahtar Kelimeler

• Toprak organik karbonu
• toprak fiziko-kimyasal özellikleri
• arazi kullanımı
• arazi örtüsü
• Vezirköprü

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