Bursa, Karacabey subasar ormanı kızılağaç (Alnus glutinosa L.) meşcerelerinin ölü örtü ve topraklarının organik karbon ve besin stokları

Öz

Giriş ve Hedefler Orman ekosistemlerinde ölü örtü ve topraklar organik karbon ile besinlerin en önemli havuzlarıdır. Bu havuzların karbon ve besin stoklarına etki eden faktörlerin doğru bir şekilde ortaya konulması, dünya çapında küresel iklim değişikliğiyle mücadele yanında ormanların doğru bir şekilde yönetilmesinde büyük bir ilgi görmektedir. Bununla beraber, subasar orman ekosistemlerine ait araştırma sonuçları sınırlıdır. Bu çalışmada, Bursa, Karacabey subasar ormanlarındaki saf kızılağaç (Alnus glutinosa L.) meşcerelerinin ölü örtü ve topraklarının organik karbon ile besin stoklarının belirlenmesi amaçlanmıştır. Yöntemler Ölü örtü örneklemesi sulak (suyun yüzeyde uzun dönem kaldığı) ve karasal (suyun yüzeyde kısa dönem kaldığı) ortamdaki kızılağacın iki farklı gelişme çağındaki (Kzc3 ve Kzd3) meşcerelerinde yapılmıştır. Toprak örnekleri de aynı ortamlarda beş farklı toprak derinlik kademesinden (0-10 cm, 10-20 cm, 20-30 cm, 30-60 cm, 60-100 cm) alınmıştır. Alınan örnekler organik karbon ve besin konsantrasyonları bakımından analiz edilmiş ve sonrasında çalışma alanlarının organik karbon ve besin stokları (t/ha) hesaplanmıştır. Bulgular Kızılağaç meşcerelerinde, ölü örtü birikiminin yüksek olduğu sulak ortam ile Kzc3 meşcerelerinde ölü örtü karbon ve besin stokları, karasal ortam ve Kzd3 meşcerelerinden daha yüksek bulunmuştur. Benzer şekilde, toprak organik karbon ve besin stokları da sulak ortamda yüksek belirlenmiştir. Bununla beraber, her iki ortamda, Kzc3 meşcerelerinin toprak organik karbon ve besin stokları Kzd3 meşcerelerine göre daha düşük tespit edilmiştir. Kızılağaç meşcerelerinde, organik karbon ve azotun mineral toprağın 0-30 cm derinlik kademesinde, diğer besinlerin ise daha çok mineral toprağın >30 cm derinlik kademesinde stoklandığı belirlenmiştir. Sonuçlar Çalışma sonuçları, yüksek karbon ve besin stoklama potansiyeline sahip olduğu bilinen subasar orman ekosistemlerinin ölü örtü ve topraklarındaki organik karbon ve besin stoklarını ve etki eden faktörleri anlamaya yardımcı olacaktır. Ayrıca sonuçlar, subasar ormanların iklim değişikliğinin azaltılmasına katkısı ve etkisi ile subasar ormanlardaki besin döngüsü ve ağaç ve bitki örtüsünün geliştirilmesi ve planlanması kapsamında gelecekte yapılacak çalışmalara altlık oluşturabilecek öncül veriler sağlaması bakımından önemlidir.

Anahtar Kelimeler

• Kıyısal subasar ormanlar
• Karbon havuzları
• Makro ve mikro besinler
• toprak derinliği

Organic carbon and nutrients stocks in forest floor litter and soil of alder (Alnus glutinosa L.) stands in Bursa, Karacabey forested wetlands

Öz

Background and aims Litter and soils are the most important pools of organic carbon and nutrients in forest ecosystems. The complete and accurate assessments of the carbon and nutrient stocks of these pools and the influencing factors is a major concern that has drawn widespread attention in the fight against global climate change and in the management of forests worldwide. However, research results on flooded forest ecosystems are limited. In this study, it was aimed to determine the organic carbon and nutrient stocks of the litter and soil of pure alder stands in Bursa, Karacabey forested wetlands. Methods Litter sampling was carried out in alder stands at two different development ages (Kzc3 and Kzd3) in floodplain (where water remains on the surface for a long period) and terrestrial (where water remains on the surface for a short period) sites. Soil samples were taken from five different soil depth levels (0-10 cm, 10-20 cm, 20-30 cm, 30-60 cm, 60-100 cm) in the same sites. The samples were analyzed for organic carbon and nutrient concentrations, and then the organic carbon and nutrient stocks (t/ha) of the study sites were calculated. Results Carbon and nutrient stocks of alder in the floodplain sites and Kzc3 stands with higher forest floor litter was higher than in terrestrial sites and Kzd3 stands. Soil organic carbon and nutrient stocks were also high in the floodplain sites. However, in both sites, soil organic carbon and nutrient stocks of Kzc3 stands were found to be lower than those of Kzd3 stands. It was seen that in alder stands, organic carbon and nitrogen were stored in the topsoil (0-30 cm), while other macro- and micro-nutrients were mostly stored in the subsoil (>30 cm). Conclusions The results of this study will help to understand the organic carbon and nutrient stocks and impact factors in the litter and soil of forested wetland ecosystems. In addition, the results are important to provide preliminary data that can form a basis for studies within the scope of the contribution and impact of forested wetlands to the mitigation of climate change in the future, the development and planning of nutrient cycles and tree and vegetation cover.

Anahtar Kelimeler

• Coastal forested wetlands
• Karbon pools
• Macro and micro nutrients
• soil depths

Kaynakça

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