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SEASONAL VARIATION OF MINERAL NUTRITION FOR SESSILE OAK (QUERCUS PETRAEA (LIEBL.))

Raluca Enescu

Abstract

The sessile oak is the widest spread species of all autochthonous oaks species in Romania, forming a lower level of vegetation. The purpose of this study is to analyze the variability of leaf nutrients, as well as of soil nutrients, for two sessile oak stands situated under different forest site conditions. These two stands are located on the same type of soil: luvisol. As such, four soil profiles were realized for analyzing soil properties. Leaves samples were collected from twenty sessile oak trees, during three moments from the growing season. The same eight elements were determined for both soil and leaves components, namely: N, P, K, Ca, Mg, Fe, Cu, Zn. Furthermore, the seasonal variation of eight elements from the leaves content were studied, followed by correlations between the content of elements in the soil and in the leaves. In addition, the degree of influence exerted by some soil properties on the foliar content of nutrients (multiple regression) was also studied. The obtained results show a different mobility of these elements while a greater variability was noticed in the case of certain elements. Furthermore, it was noticed that the foliar nitrogen content was influenced by the same three soil properties.

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DOI resolver: doi.org/10.5593/sgem2018/3.2/s14.116

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