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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Fine root biomass and root length density in a lowland and a montane tropical rain forest, SP, Brazil

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Pimentel Rosado, Bruno Henrique [1, 2] ; Martins, Amanda Cristina [1, 3] ; Colomeu, Talita Cristina [1, 3] ; Oliveira, Rafael Silva [1] ; Joly, Carlos Alfredo [1] ; Marinho Aidar, Marcos Pereira [4]
Total Authors: 6
[1] Univ Estadual Campinas UNICAMP, Dept Biol Vegetal, IB, Campinas, SP - Brazil
[2] Inst Pesquisas Jardim Bot Rio de Janeiro, Unidade Bot Sistematica, BR-22460030 Rio De Janeiro, RJ - Brazil
[3] Pontificia Univ Catolica Campinas PUC, Ctr Ciencias Vida, Fac Ciencias Biol, Campinas, SP - Brazil
[4] Inst Bot, Secao Fisiol & Bioquim Plantas, Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: Biota Neotropica; v. 11, n. 3, p. 203-209, Set. 2011.
Web of Science Citations: 6

Fine roots, <2 mm in diameter, are responsible for water and nutrient uptake and therefore have a central role in carbon, nutrient and water cycling at the plant and ecosystem level. The root length density (RLD), fine root biomass (FRB) and vertical fine root distribution (VRD) in the soil profile have been used as good descriptors of resource-use efficiency and carbon storage in the soil. Along altitudinal gradients, decreases in temperature and radiation inputs (depending on the frequency of fog events) may reduce decomposition rates and nutrient availability what might stimulate plants to invest in fine roots, increasing acquisition of resources. We evaluated the seasonal variation of fine root parameters in a Lowland and Montane forest at the Atlantic Rain Forest. We hypothesized that, due to lower decomposition rates at the Montane site, the FRB and RLD at soil surface will be higher in this altitude, which can maximize the efficiency of resource absorption. FRB and RLD were higher in the Montane forest in both seasons, especially at the 0-5 layer. At the 0-5 soil layer in both sites, RLD increased from dry to wet season independently of variations in FRB. Total FRB in the top 30 cm of the soil at the Lowland site was significantly lower (334 g.m-2 in the dry season and 219 g.m-2 in the wet season) than at the Montane forest (875 and 451 g.m-2 in the dry and wet season, respectively). In conclusion, despite the relevance of FRB to describe processes related to carbon dynamics, the variation of RLD between seasons, independently of variations in FRB, indicates that RLD is a better descriptor for studies characterizing the potential of water and nutrient uptake at the Atlantic Rain Forest. The differences in RLD between altitudes within the context of resource use should be considered in studies about plant establishment, seedling growth and population dynamics at the Atlantic Rain Forest. At the ecosystem level, RLD and it seasonal variations may improve our understanding of the Atlantic rain forest functioning in terms of the biogeochemical fluxes in a possible scenario of climate change and environmental changes. (AU)

FAPESP's process: 03/12595-7 - Floristic composition, structure and functioning of the Dense Rainforest nuclei of Picinguaba and Santa Virgínia of Parque Estadual da Serra do Mar, State of São Paulo, Brazil
Grantee:Carlos Alfredo Joly
Support type: BIOTA-FAPESP Program - Thematic Grants