Kastamonu University Journal of Forestry Faculty 1303-2399 1309-4181 Kastamonu University 10.17475/kastorman.296912 Effect of Different Land Uses (Mature and Young Fir Stands-Pasture and Agriculture Sites) on Soil Organic Carbon and Total Nitrogen Stock Capacity in Kastamonu Region Kastamonu Yöresinde Farklı Arazi Kullanımının (Yaşlı ve Genç Göknar Meşcereleri-Mera-Tarım Alanları) Toprak Organik Karbon ve Toplam Azot Depolama Kapasitesine Etkileri Sarıyıldız Temel Savacı Gamze Maral Züleyha 05 05 2017 17 1 132 142 03 08 2017 02 13 2017 Copyright © 2001, Kastamonu University Journal of Forestry Faculty 2001 Kastamonu University Journal of Forestry Faculty

Land use strongly influences soil properties, andunsuitable practices lead to degradation of soil and environmental quality.Main aim of this study was to assess the impact of different land uses on somesoil properties, soil organic carbon (C) and total nitrogen (N) contents andstock capacities in Kastamonu, Turkey. Mature and young fir stands and adjacentpasture and agriculture sites were used to study the differences in some soilproperties and soil organic C and N contents and stock capacities. Mineral soilsamples were taken from two soil depths (the upper soil part 0-10 cm and thelower soil part 10-20 cm), and analysed for pH, texture, water holding capacity(WHC), salt, lime, organic matter (OM), P and K concentrations, total soilorganic C and total N content, and stock capacities. Results showed that for the soil upper part, the agriculture site hadthe lowest clay, silt, WHC, pH, P, K and OM, whereas it had the highest sandcontent. Most of these soil factors were highest in the soil from mature firstands. As for the lower soil part, there were no clear indications among theland-use types. However, the agriculture site had the highest clay, silt andsoil pH, whereas the pasture site showed the lowest clay, silt, P and Kcontents. The mature and young fir stands always showed the highest mean soil Cand N contents and stock capacities either at the upper or the lower soilparts, followed by the pasture and the agriculture sites. However, all soildepth was considered (0-20 cm), mean soil organic C stock capacity was highestfor the pasture site (50.2 Mg C ha-1), followed by the young firsite (48.6 Mg C ha-1), the mature fir site (47.4 Mg C ha-1),and the agriculture site (32.3 Mg C ha-1). Mean soil total N stock capacitywas highest for the young fir site (5.61 Mg N ha-1), followed by thepasture site (5.09 Mg N ha-1), the mature fir site (4.45 Mg N ha-1),and the agriculture site (3.33 Mg N ha1).  

Arazi kullanımı önemli derecede topraközelliklerini etkilemekte ve uygun olmayan uygulamalar toprağın ve çevrekalitesinin bozulmasına yol açmaktadır. Kastamonu Bölgesinde gerçekleştirilenbu çalışmada, farklı arazi kullanımının bazı toprak özellikleri, organik karbonve azot miktarları ve depolama kapasiteleri üzerine olan etkilerininaraştırılması amaçlanmıştır. Bu amaçla, yaşlı ve genç göknar meşçereleri ilebitişiğindeki tarım ve mera alanların bazı toprak özellikleri ile karbon veazot depolama kapasiteleri belirlenmiştir. Mineral toprak örnekleri üst (0- 10cm) ve alt (10-20 cm) olmak üzere iki farklı toprak derinlik kademesindenalınmış olup, sırasıyla bu topraklarda tekstür, su tutma kapasitesi,elektriksel iletkenlik, kireç miktarı, organik madde, fosfor (P) ve potasyum(K) konsantrasyonları yanında toplam organik karbon ve azot miktarları analizedilmiştir. Sonuçlar incelendiğinde, üst toprak kısımlarında, en düşük kil,toz, su tutma kapasitesi, pH, P, K ve organik madde miktarı ile en yüksek kummiktarı tarım alanları topraklarında tespit edilmiştir. Üst topraközelliklerinin çoğunluğu yaşlı veya genç göknar meşcerelerinde daha yüksekbelirlenmiştir. Alt toprak özellikleri değerlendirildiğinde ise, farklı arazikullanımları arasında belirgin bir farklılık tespit edilmemekle beraber, tarımalanları topraklarının en yüksek kil, toz ve pH değerlerine, mera alanlarıtopraklarının ise en düşük kil, toz, P ve K miktarına sahip olduğu görülmüştür.Yaşlı ve genç göknar meşcerelerinin üst ve alt toprakları en yüksek organikkarbon ve azot miktarı ve depolama kapasitesine sahip olurken, bu değerlerimera alanları ve tarım alanları izlemiştir. Bununla beraber, tüm toprakderinliği değerlendirildiğinde (0- 20 cm), ortalama toprak organik karbon depolama kapasitesi en yüksek meraalanlarında (50.2 Mg C ha-1), bunu sırasıyla genç göknar meşcereleri(48.6 Mg C ha-1), yaşlı göknar meşcereleri (47.4 Mg C ha-1)ve tarım alanları (32.3 Mg C ha-1) takip etmiştir. Ortalama toplamazot depolaması ise en yüksek genç göknar meşcerelerinde (5.61 Mg N ha-1)belirlenirken, bunu sırasıyla mera alanları (5.09 Mg N ha-1), yaşlıgöknar meşcereleri (4.45 Mg N ha-1) ve tarım alanları (3.33 Mg N ha-1)’naait topraklar izlemiştir. 

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