Ağaçlarda besin maddelerinin yeniden taşınması olayı ve ekolojik yönü

Besin maddelerinin “yeniden tasınması” besin maddesi döngüsünün önemli bölümünü olusturmasından ve ekosistem incelemelerinde bu hususa da yer verilmesi gerektiğinden dolayı büyük bir öneme sahiptir. Yeniden tasınma, yetisme ortamının besin maddesi varlığı, ağaç türü ve besin maddelerinin kullanım özellikleri ile değismektedir. Bu çalısma ile yeniden tasınma olayının gerçeklestiği ağaç organları, yeniden tasınmayı etkileyen etkenler, yeniden tasınma olayının değerlendirilmesinde göz önüne alınması gereken hususlar sunulmaya çalısılmıstır. Önemli oranda yapraklarda gerçeklesen bu olayın (a) iğne yapraklı ağaçlar ile yapraklı ağaçlar arasında farklı siddetlerde meydana geldiği; (b) yeniden tasınma olayının diğer unsurlarla birlikte değerlendirilmesi gerektiği; (c) köklerde gerçeklesen yeniden tasınma olayının daha çok kurak alanlarda gerçeklestiği elde edilen somut sonuçlardır.

Anahtar Kelimeler:

azot, besin maddesi yarayışlılığı, besin maddesi taşınması, besin maddeleri, ağaçlar, besin maddesi alımı, yeniden taşınma

Retranslocation of nutrients in and its ecological circumstance

Since “retranslocation” comprises a large portion of nutrient cycle and which also should be reconsidered in ecosystem investigations, it has a great importance. Retranslocation varies through nutrient wealth of a given site, tree species and nutrient use characteristics of trees. In this study an attempt was made to present the collection of researches on retranslocation, the tree organs where it occurs, the factors effective on retranslocation, and the additional components with which retranslocation should be appreciated together. As a conclusion; (a) there are significant differences between conifer and deciduous forest trees; (b) retranslocation should be evaluated in integrity with several alternative indices; (c) retranslocation in roots generally exists more in dry sites.

Keywords:

nitrogen, nutrient availability, nutrient transport, nutrients, trees, nutrient uptake, translocation,

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