DOI: 10.5281/zenodo.6525627
title: Fire promotes functional plant diversity and modifies soil carbon dynamics in tropical savanna

description: Dataset associated with the manuscript <strong>"Fire promotes functional plant diversity and modifies soil carbon dynamics in tropical savanna" </strong>(Teixeira et al.). It includes 6 different datasets and for all datasets, we provided one metadata.<br> Version 2 includes an update of the biomass data set including the correct transformation to g/m2 on fine roots biomass data. <br> <br> fluxes: it includes data related to net ecosystem C and water exchange. NEE and ET from each plot were measured using the LiCOR 7500 infrared gas analyzer (Li-Cor Inc.). See the method section in the manuscript for full details. soil_carbon: it includes carbon soil data.<br> <br> biomass_v2: it includes data related to aboveground and belowground biomass. Aboveground data were collected in 0.5m2 subplot and belowground at 0.25m2 at 20cm depth both within 1m2 sampling plot. See the method section in the manuscript for full details. aboveground_traits: all aboveground functional traits from plant species. See the method section in the manuscript for full details. belowground_traits: all roots functional traits from plant species. See the method section in the manuscript for full details. species_composition: plant community composition. See the method section in the manuscript for full details. <br> <strong>Abstract</strong><br> Fire is an evolutionary environmental filter in tropical savanna ecosystems altering functional diversity and associated C pools in the biosphere and fluxes between the atmosphere and biosphere. Therefore, alterations in fire regimes (e.g. fire exclusion) will strongly influence ecosystem processes and associated dynamics. In those ecosystems, C dynamics and functions are underestimated by the fire-induced offset between C output and input. To determine how fire shapes ecosystem C pools and fluxes in an open savanna across recently burned and fire excluded areas, we measured the following metrics: (I) plant diversity including taxonomic (i.e. richness, evenness) and plant functional diversity (i.e. functional diversity, functional richness, functional dispersion and community weighted means); (II) structure (i.e. above- and below-ground biomass, litter accumulation); and (III) functions related to C balance (i.e. net ecosystem carbon dioxide (CO<sub>2</sub>)<sub> </sub>exchange (NEE), ecosystem transpiration (ET), soil respiration (soil CO<sub>2</sub> efflux), ecosystem water use efficiency (eWUE) and total soil organic C (SOC). We found that fire promoted aboveground live and belowground biomass, including belowground organs, and coarse and fine root biomass, and contributed to higher biomass allocation belowground. Fire also increased both functional diversity and dispersion. NEE and total SOC were higher in burned plots compared to fire-excluded plots whereas soil respiration recorded lower values in burned areas. Both ET and eWUE were not affected by fire. Fire strongly favored functional diversity, fine root, and belowground organ biomass in piecewise SEM models but the role of both functional diversity and ecosystem structure to mediate the effect of fire on ecosystem functions remain unclear. Fire regime will impact C balance, and fire exclusion may lead to lower C input in open savanna ecosystems.
description: Funding from National Geographic Society grant (NGS 51903C-18), FAPESP (#2015/06743-0),CNPq (#141715/2018-9 and #303988/2018-5) and Fulbright Program grant (DDRA 2019-2020).