Deposição de serrapilheira como indicador de produtividade em diferentes materiais genéticos de Eucalyptus sp., no sudoeste do Paraná

Abstract

This work evaluated the cycling of nutrients through the burlap deposition, in different genetic materials of Eucalyptussp., in Dois Vizinhos – PR. The study it was lead in area of Test of Multiple Use of Eucalipto (TUME) in the Experimental Station of the UTFPR-DV, evaluated 10 genetic materials with use of four collectors in each one, with amostral area of 0,5 m ², set to 70 cm of height of the ground, with monthly collections during 2 years (2012-2014). The collected material was dry in heats 65°C and heavy with scale of precision of 0,01g. The fees of decomposition of the burlap through the coefficient of decomposition k of Olson had been estimated. calculated the correlation enters the monthly deposition with local meteorological data and dendrométricos data. The results had shown that the average production between the species, in year 1, was bigger, 4.138,4 kg/ha, but without significant difference. The fraction leaf represented 71.4%, followed of twigs with 11% and miscellany 17.6%. The genetic material that more produced burlap, in year 1, was E. camaldulensis, with 4.802,4 kg/ha e, for year 2 was E. propinqua, with 4.769,1 kg/ha. Great variation was verified weather in the burlap deposition, along the 2 years, observing peaks of production, August and September, in general way, the climatic variable had not presented forts correlations with the deposition of the burlap. The deposition for E. pellita presented fort correlation with dendrométricas variable H and DAP for leaves. The decomposition represented for coefficient k of Olson, was presented of normal form as in other studies, around 1, with excessão of Clone H-13 (k=0,562), representing slow decomposition, representing slow decomposition, indicating that influence of its localization in the seek area presented influence, and decomposition sped up for E. pellita k=1,383, considered value very high and that it can indicate its dependence how much to the nutrients contained in the burlap accumulated on the ground.