Classification of radicular biomass and monitoring of litter in Pantanal and Cerrado Mato-Grossense

Abstract

The quantification of root biomass and the assessment of its dynamics in forest ecosystems has been intensified due to its important role in carbon sequestration and storage and the possible consequences under climate change conditions. In general, biomass stocks between and within forest ecosystems are highly variable. It is necessary to study all the different components of vegetation, however, the vast majority of the works found in the literature, address only the biomass of the aerial part of the plants, with few studies involving the quantification of these stocks by the roots, in the different ecosystems. The present study objective quantify and classify a root biomass with a depth of 0 to 10 cm, and to monitor accumulated litter in the soil (litter pool), in two different regions, in the Pantanal (Acurizal) and in the Cerrado (Sensu stricto) Mato-Grossense. The root biomass was obtained by means of unformed soil samples (0-10 cm) and the roots were classified by diameter, with the aid of digital calipers, between thick (> 10 mm), medium (5-10 mm), slightly thin (2-5 mm) and fine (<2 mm). The samples collected monthly between August 2018 and July 2019. Was observed that in both areas, about 90% of the roots collected, were fine (<2 mm). The root density in Acurizal was on average 124.92 g/m² and in Sensu stricto it was on average 57.5 g/m². The difference in root density in the soil, between the two study areas, significant (p<0.05). However, there no significant difference in root density between the dry and wet periods in each area. The monthly average of litter pool in the area of Acurizal and Sensu stricto was, respectively: 526.52 g/m² and 588.96 g/m². In both areas, the accumulated litter was significantly different between periods of drought and precipitation.

Net Primary Production and Ecosystem Carbon Flux of Brazilian Tropical Savanna Ecosystems From Eddy Covariance and Inventory Methods

“…Because P R was not measured for either site during the study period, it was estimated from P W since it was the most consistently measured component and there was enough information from our data and other studies to provide a justifiable estimate of P R . Results from tropical forests indicated that the ratio of P R (coarse and fine) to P W was between 0.80 and 1.25 (Chambers et al, 2004;Malhi et al, 2009);however, Pinto Jr. et al (unpublished) and Taques (2020) found a ratio of 1.96-2.83 for the seasonally flooded Cerrado forest studied here. We chose an average of 1.7 from these studies (Table 1).…”

“…Results from tropical forests indicated that the ratio of P R (coarse and fine) to P W was between 0.80 and 1.25 (Chambers et al., 2004; Malhi et al., 2009); however, Pinto Jr. et al. (unpublished) and Taques (2020) found a ratio of 1.96–2.83 for the seasonally flooded Cerrado forest studied here. We chose an average of 1.7 from these studies (Table 1).…”

Quantification of Root Biomass in Post-Mining Areas in the Municipality of Capitão Poço – PA, Brazil

“…In the three areas analyzed in this study, it was observed that from a depth of 10-20 cm there were decreases in the concentrations of thick roots, which may be due to the Amazonian soils having higher concentrations of nutrients in the more superficial layers, supporting the development of roots in these depths [11]. In similar research, it was observed that the thick roots are spaced in the topsoil, a behavior that may be related to the purpose of each type of root, such as support, nutrient absorption, mineral and water absorption [12]. There were also significant differences in the 0-10 and 10-20 cm shallow depths in relation to other areas for native forest, which may have occurred because the native forest was in balance with the environment and did not suffer anthropic disturbances.…”