Abstract
This study was part of the Manipulation of Moisture and Nutrient Availability in Young Regrowth Forests in Eastern Amazonia Project (MANFLORA). The experiment was designed in completely randomized blocks containing control and irrigated treatments during the dry period (5 mm of water/day), with four repetitions each. The monthly mean litter values ranged from 316.10 to 997.90 kg ha-1 month-1. The magnitude of this phenomenon can be explained by the functional role of the floristic structure, represented by the species Myrcia sylvatica (G. mey) DC., Myrcia bracteata (Rich) DC., Miconia ciliata (Rich) DC., Lacistema pubescens Mart., Lacistema aggregatum (Berg.) Rusby, Vismia guianensis (Aubl.) Choisy, Cupania scrobiculata Rich. and Ocotea guianensis Aubl., which constituted the determinant factors, associated with the hydroperiodic effect and ecosystem manipulation. The monthly mean of the analytical results of mass treatments were significant (P < 0.05), however, when compared annually there was no significance, which indicates seasonal influence, since the period of greatest deposition is the dry one, regardless of the water manipulation along the period studied. Only in time the mass values of Ca and Mg were not significant for treatment (P < 0.05). The amount of Ca was significantly (P < 0.05) higher than that of Mg.
Highlights
Tropical regions are characterized as locals of intense luminosity, abundant rainfall, and predominance of soils with clay minerals of low activity
Litter can be defined as all types of biogenic material in different stages of decomposition, which represents a potential source of energy for consumer species
As for the species, the number found in this experiment was considered low, but it followed the pattern of the secondary forests of the Bragantina Zone, which have few species
Summary
Tropical regions are characterized as locals of intense luminosity, abundant rainfall, and predominance of soils with clay minerals of low activity. It is precisely in these regions that it is observed a high level of plant biodiversity Among these characteristics, the nutrient poverty of the soil caused most studies on nutrient cycling to focus on biotic compartments, mainly litter, of easier measurement (Klinge & Rodrigues, 1968; Clevelário Júnior, 1988; Summers, 1998). Litter production is considered the most important mean of transferring essential elements from vegetation to soil (Nascimento et al, 2018). It is fundamental for the knowledge of the structure and functioning of forest ecosystems. Many biotic and abiotic factors influence in litter deposition, such as: vegetation type, latitude, altitude, relief, temperature, rainfall, light availability during growing season, photoperiod, evapotranspiration, deciduousness, successional stage, water availability and jas.ccsenet.org
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