Influência da dinâmica atmosférica na produção de serapilheira em um manguezal da costa amazônica.

Abstract

This work aimed to investigate the influence of atmospheric dynamics on litterfall production in the Cuiarana mangrove, Salinópolis, Amazon Coast. The seasonal rainfall variation was analyzed along with the precipitating systems on the Amazon coast and its influence on the variability of litterfall production. It was also characterized the temporal variation of the direction and speed of the wind and its influence on the spatiotemporal production of litterfall. In a mangrove forest, 3 sample plots were delineated with 3 mangrove species Rizophora mangle, Avicennia germinans and Laguncularia racemosa. In each plot, 4 traps 1 m2 were randomly installed. Meteorological data were obtained from the Micrometeorological Tower of the UFRA located in the study area. The main statistical methodologies used were two-way and one-way ANOVA, linear regression analysis (p <0.05) and Principal Components Analysis (PCA). The results show that the temporal variation of precipitation is modulated by different meteorological systems, where the months of March, April and May appear as the region's rainiest quarter. The annual distribution of wind direction showed predominance in the eastern (E), frequency of winds with higher velocity were recorded in the second semester. In the litterfall production there was a significant difference between the values of monthly production and between the fractions. The annual total litter production was 9.4 ± 0.06 Mg ha-1 year-1, where 67% was composed by the leaf fraction. Leaves had negative trends with precipitation, but woody and reproductive material had positive trends. The ACP shows in 4 components negative correlation with reproductive material and positive correlation with wood associated with the temporal variation of winds and rainfall.