Forest management practices alter forest structure quantified with ecosystem characteristics and values. In this paper, we utilized a forest management simulation model to assess the effects of three forest management strategies focusing on timber production, carbon sequestration, oxygen production, soil erosion, and water production of a forest management unit in Turkey. A forest simulation model "ETÇAPSimülasyon" was developed and used to project forest ecosystem development over 100 years under three forest management policies of timber-oriented forest management (TFM), multipurpose forest management (MFM), and no intervention (NI). The results showed that TFM strategy produced more timber and its net present value than MFM and NI strategies did. The amount of carbon sequestration and oxygen production potential was also found to be the highest with TFM strategy than with the MFM and NI strategies. Compared with the other strategies, however, NI strategy produced the highest amount of water production and soil losses over the planning horizon. The effects of a forest management strategy depend mainly on the initial forest structure, the rate of development and the level of forest management interventions. Therefore, forest dynamics under various management strategies should be explained before the final management decision. Understanding long-term effects of any management strategies on forest structure will provide the basis for better reaching the management objectives.
ÖzetBu makalede, ekosistem tabanlı çok amaçlı planlama anlayışına göre geliştirilmiş bir simülasyon tabanlı konumsal orman amenajmanı planlama modeli tanıtılmıştır. Öncelikle modelin genel mimari çatısı kısaca açıklanmıştır. Model daha sonra örnek bir orman planlama biriminde uygulanmıştır. Bu amaçla konumsal özellikleri dikkate almayan bir temel simülasyon senaryosu ile farklı konumsal özelliklerin yer aldığı üç farklı planlama senaryosu olmak üzere toplamda dört tane planlama senaryosu üretilmiştir. Bu planlama senaryoları değişik performans göstergeleri (eta, dikili servet, net karbon birikimi, simülasyon süresi sonundaki yaş sınıfı dağılımı) kapsamında karşılaştırılmıştır. Planlama senaryolarının karşılaştırılması sonucunda, konumsal olmayan planlama senaryosu ile konumsal planlama senaryoları arasında eta açısından büyük farklılıkların olmadığı saptanmıştır. Ancak, konumsal planlama senaryoları ile birlikte orman ekosisteminde konumsal düzenlemenin etkin bir şekilde yapıldığı ve daha uygulanabilir orman amenajman planlarının üretilebileceği belirlenmiştir.Anahtar Kelimeler: Konumsal orman planlaması, Simülasyon, Modelleme, Orman amenajmanı
Preparing Forest Management Plans With Spatial Simulation Model AbstractThis manuscript presents a simulation-based spatial forest management planning model developed for ecosystembased multiple use forest planning approach. The general framework of the simulation model was firstly introduced. It was then implemented in a typical forest management planning unit. Four forest management planning scenarios including nonspatial and spatial characteristics were developed. These scenarios were compared in the context of different forest performance indicators (such as allowable cut, growing stock, net carbon sequestration, age-class distribution at the end of the simulation). When compared the simulation-based forest management planning scenarios, it was found that there were no significant changes in timber production levels among scenarios. On the other hand, spatial forest management scenarios controlled forest ecosystem structure and produced more applicable forest management plans.
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