IMPACT OF CEDRUS LIBANI AFFORESTATION ON SOIL CARBON AND NITROGEN STOCKS IN THE UPPER MEDITERRANEAN BASIN
Year 2025,
Volume: 9 Issue: 1, 75 - 88, 30.04.2025
Emre Babur
,
Burak Yalçıntaş
,
Yasin Taha Ünsal
Abstract
Soils, as the most dynamic and complex components of terrestrial ecosystems, serve as crucial sinks for atmospheric carbon storage and retention. Human interventions in soil management significantly influence the amount of carbon and nitrogen stored or sequestered. This study investigated the effects of afforestation using Cedrus libani A. Rich (Lebanese cedar or Taurus cedar) at two different ages (10 and 25 years) in the Upper Mediterranean basin on soil organic carbon and nitrogen stocks. The afforestation was conducted on previously bare lands for soil conservation purposes. A total of 45 soil samples were collected from topsoil (0–10 cm): 15 samples were randomly taken from two different times (2000 and 2015) afforested areas and 15 from non-afforested (control) land. Soil organic carbon (SOC), total nitrogen (TN), and bulk density (BD) analyses were performed on these samples. To calculate soil organic carbon stocks in tons per hectare, bulk density (BD) was estimated using the SOC and soil mass equation. The results revealed a substantial increase in carbon and nitrogen storage in the afforested areas, depending on tree age. Specifically, organic carbon and nitrogen stocks in the topsoil of 25-year-old and 10-year-old afforestation sites were 65% and 48% higher, respectively, than in control soils. Carbon and nitrogen storage followed the trend: 25-year > 10-year > 0-control. The highest total nitrogen content (0.78%) was observed in 10-year-old cedar afforestation sites. While BD values did not differ significantly among afforested areas, the control areas showed distinct differences from the afforested sites. This study demonstrates that age-protected cedar afforestation significantly enhances carbon and nitrogen sequestration in previously bare soils, highlighting its importance for soil conservation and ecosystem sustainability.
Ethical Statement
This study does not require any ethics committee approval.
Supporting Institution
The study received no financial support.
Thanks
The authors would like to thank Erdemli Forest Management Directorate staff, Master's student Nisanur Belge and Res. Asst. Ferhat Kepek for their help.
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CEDRUS LIBANI AĞAÇLANDIRMASININ YUKARI AKDENİZ HAVZASINDA TOPRAK KARBON VE AZOT STOKLARI ÜZERINDEKİ ETKİSİ
Year 2025,
Volume: 9 Issue: 1, 75 - 88, 30.04.2025
Emre Babur
,
Burak Yalçıntaş
,
Yasin Taha Ünsal
Abstract
Karasal ekosistemlerin en dinamik ve karmaşık yapıtaşı olan topraklar atmosferik karbonun tutularak depo edildiği en önemli yutakların başında gelmektedir. Topraklara yapılan müdahaleler depo edilen veya edilecek olan bu karbon ve azot miktarlarını değiştirmektedir. Bu çalışmada, toprak koruma amacıyla yukarı Akdeniz havzasındaki çıplak arazilerde 25 ve 10 yıllık Cedrus libani A. Rich (Lübnan sediri veya Toros sediri) kullanılarak yapılan ağaçlandırmaların toprakların organik karbon ve azot stoklarına olan etkileri araştırılmıştır. İki farklı zamanda (2000 ve 2015) ağaçlandırma yapılan alanlardan rastgele olarak 15 er adet ve ağaçlandırma yapılmayan çıplak bir araziden de 15 adet toprak alınmak suretiyle toplamda 45 adet toprak numunesi 0-10 cm derinliğinden alınmıştır. Toprak örneklerinde organik karbon (TOK), toplam azot (TA) ve hacim ağırlığı (HA) analizleri yapılmıştır. TOK ve TA stoklarını hektar başına ton cinsinden hesaplamak için HA, TOK veya TA ve toprak kütlesi eşitliğinden yararlanılarak tahmin edilmiştir. Elde edilen veriler sonucunda yaşa bağlı olarak çok ciddi miktarda sedir ağaçlandırma sahalarında karbon ve azot depolandığı, özellikle 25 ve 10 yaşlarındaki ağaçlandırma sahasındaki üst topraklarda depolanan karbon ve azot miktarının kontrol topraklarına nispeten sırasıyla %65 ve %48 daha fazla olduğu belirlenmiştir. Bu alanlardaki karbon ve azot depolama yaşa göre 25>10>0 şeklinde sıralanmıştır. Buna karşın toprakların toplam azot miktarlarında en yüksek değer 0.78 ile 10 yaşındaki sedir ağaçlandırma sahalarında bulunmuştur. İstatistiksel olarak ağaçlandırma yapılan alanlardaki hacim ağırlıkları birbirlerinden farklı olmadığı halde kontrol alanlarının hacim ağırlıkları ağaçlandırma yapılan alanlardan farklı bulunmuştur. Bu çalışma, yaşa bağlı olarak korunan sedir ağaçlandırma çalışmalarının çıplak topraklarındaki karbon ve azot miktarının önemli derecede arttırdığını göstermiştir.
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-
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-
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-
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-
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-
Dindaroglu, T., Tunguz, V., Babur, E., Menshov, O. & Battaglia, M. L. (2021b). Determination of the relationship among compound Topographic Index (CTI), soil properties and land-use in karst ecosystems. Physical Geography.
-
Dindaroglu, T., Boran, B., Babur,E. & Menshov, O. (2024). Long-term temporal variation of land use transition on soil carbon stocks in mediterranean karst ecosystems. Forestist, 74(1), 94-101.
-
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-
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-
Gong, C., Tan, Q., Liu, G. & Xu, M. (2021). Forest thinning increases soil carbon stocks in China. Forest Ecology and Management, 482, 118812.
-
Guo, L.B., Wang, M. & Gifford, R.M. (2007). The change of soil carbon stocks and fine root dynamics after land use change from a native pasture to a pine plantation. Plant and Soil 299, 251–262.
-
Hong, S., Cong, N., Ding, J., Piao, S., Liu, L., Peñuelas, J. et al. (2023). Effects of afforestation on soil carbon and nitrogen accumulation depend on initial soil nitrogen status. Global Biogeochemical Cycles, 37, e2022GB007490.
-
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-
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-
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-
Kara, O., Babur, E., Altun, L. & Seyis, M. (2016). Effects of afforestation on microbial biomass C and respiration in eroded soils of Turkey. Journal of Sustainable Forestry, 35(6), 385–396.
-
Lee, J., Hopmans, J. W., Rolston, D. E., Baer, S. G. & Six, J. (2009). Determining soil carbon stock changes: Simple bulk density corrections fail. Agriculture, Ecosystems and Environment, 134, 251–256.
-
Kokanc, S.Y. (2014). Effects of afforestation on soil organic carbon and other soil properties. Catena, 123, 62–69.
-
Lal, R. (2001). World cropland soils as a source or sink for atmospheric carbon. Advance Agronomy. 71, 145–191.
-
Lal, R. (2004). Soil carbon sequestration to mitigate climate change. Geoderma 123:1–22. doi:10.1016/j.geoderma.2004.01.032.
-
Lee, L., Makineci, E., Tolunay, D. & Son, Y. (2018). Estimating the effect of abandoning coppice management on carbon sequestration by oak forests in Turkey with a modeling approach. Science of Total Environment. 640–641:400–405.
-
Lee, J., Tolunay, D., Makineci, E., Çömez, A., Son, Y. M., Kim, R. & Son, Y. (2016). Estimating the age-dependent changes in carbon stocks of Scots pine (Pinus sylvestris L.) stands in Turkey. Annals of Forest Science, 73(2), 523–531.
-
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-
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