Deposição de nutrientes pela serapilheira em um fragmento de Floresta Estacional Decidual no Rio Grande do Sul

Abstract

Nutrients input from litter in a seasonal deciduous forest fragment in Rio Grande do SulKnowledge on nutrient deposition from species that compose the Deciduous Forest is incipient. The objective of this study was to determine the nutrient input by different species, from litter deposition in a Seasonal Deciduous Forest in Itaara, RS. Six plots (25.0 m x 17.0 m) were installed for litter collection,. In each plot, 5 mesh-screen traps were allocated. The litter was monthly collected from January 2006 to December 2007. Litter was sorted out in leaves, twigs (diameter < 0.5 cm) and mixture (flowers, fruits, seeds and non identified plant parts). Leaves were separated regarding the most representative species in the forest. The material was analyzed for the levels of macro and micronutrients. The concentration of nutrients differed between species. The highest nutrient input occurred from the leaf fraction, followed by twigs and mixture. Among the evaluated species, Parapiptadenia rigida showed the highest nutrient transfer, except for Mn that was highest in Matayba elaeagnoides, and Ocotea pulchella. O conhecimento do aporte de nutrientes das espécies que compõem a Floresta Estacional Decidual é ainda incipiente. Objetivou-se, neste trabalho, determinar a deposição de nutrientes pela serapilheira de diferentes espécies, em uma Floresta Estacional Decidual, no município de Itaara, RS. Para a coleta de serapilheira, foram demarcadas seis parcelas de 25,0 m x 17,0 m cada, sendo distribuídos cinco coletores em cada parcela. As coletas de serapilheira foram realizadas mensalmente, no período de janeiro de 2006 a dezembro de 2007. A serapilheira foi separada em folhas, galhos finos (diâmetro < 0,5 cm) e miscelânea (flores, frutos, sementes e restos vegetais não identificáveis). As folhas foram separadas de acordo com as espécies mais representativas da floresta. O material foi analisado quanto aos teores de macro e micronutrientes. A concentração de nutrientes diferiu entre as espécies. A maior transferência de nutrientes ocorreu por meio da fração folhas, seguido pelos galhos finos e miscelânea. Dentre as espécies avaliadas, a espécie Parapiptadenia rigida apresentou a maior transferência de nutrientes, com exceção do Mn, o qual foi mais transferido pela espécie Matayba elaeagnoides, juntamente com a espécie Ocotea pulchella.Palavras-chave: floresta nativa, mata atlântica, nutrição florestal, produção de serapilheira

Litterfall Dynamics and Nutrient Cycling in an Experimental Plantation of Peach Palm (Bactris gasipaes Kunth)

“…In leaflets, nutrient content followed the order N > Ca > K > Mg > P, whereas, in rachises, the order of nutrient concentration was K > N > Ca > Mg > P (Table 2). Marafiga et al (2012) observed the same order of nutrient concentration in leaflet litter collected in a seasonal semideciduous forest. In the study by Gomes et al (2010), the nutrient content of litterfall collected in a dense ombrophilous forest followed the order Ca > K > Mg > P. Diniz et al (2015) studied the nutrient composition of litter produced in Atlantic Forest fragments at intermediate stages of succession and found the following order: Ca > N > K > Mg > P.…”

“…Thus, knowledge of litter production and decomposition provides a basis for comprehending how an ecosystem functions (Herrera, 1989). The leaf fraction of litterfall has the highest nutrient density and is responsible for a faster transfer of macronutrients than the other fractions (Bianchin et al, 2016;Godinho et al, 2013;Machado et al, 2015;Marafiga et al, 2012;Pinto et al, 2016;Ribeiro et al, 2017). Litterfall decomposition and nutrient accumulation rates depend on several factors: climatic conditions, type of substrate, macronutrient content, and C/N/P ratios (Arco-Verde et al, 2009).…”

Ecological Restoration in Conservation Units

“…Additionally, ecological processes, such as nutrient cycling and soil enzymatic activity [37], are related to stabilization and soil fertility [38]. In the same region of the conservation unit, [10] found that with leaf deposition of the leguminous tree Parapiptadenia rigida, soil nutrients returned to 32.4 kg ha From 2010 onwards, some attributes were evaluated to verify the recovery of degraded environments. We analyzed the vegetation structure, the diversity and ecological processes, which served as a parameter to evaluate different areas under restoration in the conservation unit.…”

“…These species define local patterns of both organic matter accumulation in the soil [9] and nutrient cycling [10]. They help soils against the effects of erosion processes, favoring water infiltration (less runoff) and the definition of the microclimate standards of the habitat (shading, air and soil temperature, etc.)…”

Deposição e concentração de nutrientes da serapilheira de seis espécies nativas do Pontal do Paranapanema: uso da biodiversidade funcional em sistemas agroflorestais

“…Por essa ocasião muitos autores encontraram cálcio na serapilheira em altas quantidades superando até mesmo a concentração de nitrogênio. (SCHUMACHER et al 2004;PIMENTA et al 2011;MARAFIGA et al 2012;SANTOS et al, 2014) Essa alta contribuição da serapilheira na ciclagem de Ca possui fundamental importância para o aporte deste elemento ao sistema. Este estudo apresentou diferenças na dinâmica de concentração deste elemento na serapilheira oriunda das diferentes espécies.…”