Produção de serapilheira e restituição de nutrientes em florestas secundárias do litoral paranaense

Abstract

Litterfall and restitution of nutrientes in secondary forests of the coast Paraná stateAbstract: Monthly collections of litterfall were collected in secondary forest areas with different ages under the control of Dense Ombrophylous Submontane Forest in Paraná state 25 collectors of 1 m² suspended systematically distributed in 1 ha each; with the objective of estimating the production of litter: Annual, seasonal, by fractions leaves, twigs, reproductive organs and remains, and the amount of nutrients restored. Secondary forests were called SF, with SF-1 and SF-2 being approximately 100 years old (more developed); SF-3 and FS-4 between 60 and 80 years (intermediate); SF-5 between 40 and 60 years and SF-6 between 20 and 30 years (less developed). After the quantifications of the phytomass, homogenization and milling were performed for chemical analyzes of C, N, P, K, Ca and Mg. The annual production was between 5 and 10 Mg ha -1 year -1 and a statistical difference was observed in annual and seasonal production, with summer and spring being the highest deposition rates. The annual deposition had no relation with the age and phytosociological structures of the forests.The leaves fraction was responsible for the higher rates and pattern of deposition in the areas, but the miscellaneous fraction contributed to the higher nutrient return in the soil in the more developed forests. The annual amount of nutrients returned had the sequence C>N>Ca>K>Mg>P in the areas, with the exception of FS-1, with a higher content of Mg in relation to K. The sequence in the annual nutrient supply was FS-1 = FS-2>FS-5>FS-6>FS-4>FS-3 concluding that more developed forests returned more nutrients to the soil.

Spatial and temporal structure of diversity and demographic dynamics along a successional gradient of tropical forests in southern Brazil

“…The soils of all areas include Dystric Acrisol and Cambisol in Stand‐25, Stagnic Dystric Gleysol and Dystric Cambisol in Stand‐60, Dystric Cambisol in Stand‐75, Stand‐90, and Stand‐100A; and Dystric Acrisol and Dystric Cambisol in Stand‐100B (Gobel, ; IUSS Working Group WRB, ). All soils are characterized by high acidity, high concentrations of C, and low or very low levels of nutrients (P, K, Ca, and Mg) in the 0–20‐cm layer (Woiciechowski & Marques, ).…”

Biomass and Nutrients in the Forest-Floor Litter of Second-Growth Brazilian Atlantic Forests

“…Contrarily, Ca has little mobility in plant tissues, which results in higher levels in litter than in live leaves (CALDEIRA et al, 2008). The slightly lower concentrations of C found in the ML fraction result from the more advanced decomposition process of this fraction, which disagrees with the findings by Woiciechowski and Marques (2017), who reported small variations in C levels between the fractions evaluated. Concentration of N is smaller in woody fractions than in leaf fractions, as it is part of chlorophyll and other compounds in the active metabolism of plants, which are more concentrated in photosynthetic organs (BREDEMEIER; MUNDSTOCK, 2000).…”

Interaction of macroinvertebrates in leaf litter in forest ecosystems: a review

“…Unlike the hot and humid equatorial regions, the cold regions have lower yields, in which the highest yields occur (Bray & Gorham, 1964). However, it is possible to observe a large leaf litter production during the spring (Woiciechowski & Marques, 2017). Forests located in alpine or arctic regions produce approximately one ton per hectare annually, cold temperate forests (3.5 ton.ha -1 ), equatorial forests (11 ton.ha -1 ), and warm temperate forests (5,5 ton.ha -1 ) (Bray & Gorham, 1964).…”