Abstract
The aim of this study was to evaluate the contribution of pure stands of Eucalyptus camaldulensis and Acacia mangium for litter deposition and nutrient return in a pit of clay extraction in northern Rio de Janeiro (RJ). We conducted a randomized block design experiment with two treatments and three replications. For the evaluation of the annual deposition of litter and nutrients (N, P, K, Ca and Mg), we used circular collectors during a year (from July 2006 to June 2007). The planting of Acacia mangium in clay extraction pits contributed with the largest annual deposition of litter and with a litter of better quality compared to Eucalyptus camaldulensis , with higher levels of P and N and lower C:N and polyphenol:N ratios. This fact possibly allows higher rates of decomposition by edaphic microorganisms and, hence, a faster release of these nutrients to the soil. In addition, the planting of legumes showed higher annual deposition of P and N.
Highlights
The exploitation of mineral resources is among the human activities that most promote impacts on natural areas (SILVA; MARGUERON, 2002; CABRAL; ALBUQUERQUE, 2012), due to the drastic landscape alteration and removal of vegetation and soil (VALICHESKI; MARCIANO, 2008; MECHI; SANCHES, 2010)
In northern Rio de Janeiro (RJ) some areas have been exploited by the activity of extracting clay for brick and tile production, which has led to the degradation of the soil and landscape (COSTA JUNIOR, 1997; RODRIGUES et al, 2006; VALICHESKI; MARCIANO, 2008)
It was found that only A. mangium showed variation between seasons regarding litter deposition, and they were significantly higher in winter and spring
Summary
The exploitation of mineral resources is among the human activities that most promote impacts on natural areas (SILVA; MARGUERON, 2002; CABRAL; ALBUQUERQUE, 2012), due to the drastic landscape alteration and removal of vegetation and soil (VALICHESKI; MARCIANO, 2008; MECHI; SANCHES, 2010). In northern Rio de Janeiro (RJ) some areas have been exploited by the activity of extracting clay for brick and tile production, which has led to the degradation of the soil and landscape (COSTA JUNIOR, 1997; RODRIGUES et al, 2006; VALICHESKI; MARCIANO, 2008) The revegetation of these areas with arboreal Fabaceae species that fix atmospheric nitrogen and eucalyptus have been a viable option for the rehabilitation of the soil, promoting improvements in its chemical and biological qualities (SCHIAVO et al, 2009; MENDONÇA, 2006; BATISTA et al, 2008; SILVA et al, 2013, 2012). The dynamics of litter and its nutrients, represented by the input via deposition and output via decomposition and/or mineralization, is important for maintaining both native forests and forest plantations (FERREIRA et al, 2007)
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