Rainfall Regime on Fine Root Growth in a Seasonally Dry Tropical Forest

Andrade, Eunice Maia de; Rosa, Gilberto; Almeida, Aldênia Mendes Mascena de; Silva, Antonio Givanilson Rodrigues da; Sena, Maria Gina Torres

doi:10.1590/1983-21252020v33n218rc

Cited by 4 publications

(4 citation statements)

References 30 publications

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“…These lower values can be explained by the degree of degradation in the area, as with the reduction of vegetation coverage, the amounts of roots also decreased (Premrov et al, 2017). According to Andrade et al, (2020), the amount of fine roots in pasture area ranged from 5.33 to 25.83 g, which are within values found in this study. The same authors Research, Society andDevelopment, v. 11, n. 1, e53811125333, 2022 (CC BY 4.0) | ISSN 2525-3409 | DOI: http://dx.doi.org/10.33448/rsd-v11i1.25333 6 also reported that the results found in their work in relation to the behavior of fine root biomass are inversely proportional to depth, and the amounts of roots decreased around 36% in the layer of 5-30 cm.…”

Section: Resultssupporting

confidence: 80%

Root biomass under different soil uses and native Cerrado in Tocantins, Brazil

Lima

Araujo

Filho

et al. 2022

RSD

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Studies on the importance of root biomass and the effects that changes in vegetation coverage cause on carbon amount and stock are scarce, especially in the cerrado biome. Taking into account the scarcity of information about root biomass estimates, this work aimed to quantify root biomass under different land uses and native cerrado in Tocantins, Brazil. The research was conducted in different land uses: agriculture, pasture, eucalyptus and control with native cerrado forest. Six trenches with dimensions of 70 x 70 cm were opened and root biomass was collected at depths of 0-10, 10-20, 20-30, 30-40 and 40-50 cm. With the aid of a sieve, root biomass was collected and separated into fine and coarse roots. The amounts of fine and coarse root biomass showed the highest mean values of 7.7 and 12.9 g, respectively, in the eucalyptus area. Root biomass stocks were higher in the eucalyptus area, with maximum values above 3.68 Mg ha-1. Root biomass amounts and stocks were greater in eucalyptus areas, since forest areas, whether planted or native, manage to keep the environment in balance due to their long-term cycles, greater stability and low degree of disturbance.

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Section: Resultssupporting

confidence: 80%

Root biomass under different soil uses and native Cerrado in Tocantins, Brazil

Lima

Araujo

Filho

et al. 2022

RSD

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“…Recent studies on DH species found that root biomass was largely concentrated near the tree base and within the top 20 to 40 cm of soil (Albuquerque et al., 2015 ; Costa et al., 2014 ). The growth of fine roots is driven by water availability, which explains why there is high investment in root length per unit of biomass in surface soils (Andrade et al., 2020 )—roots must maximize lateral exploitation of soil water, especially in dry or shallow soils. Thus, we argue that the extent to which DH trees exploit deeper soil water sources is limited, and instead, they on lateral versus vertical soil water exploitation.…”

Section: Discussionmentioning

confidence: 99%

Plant functional types broadly describe water use strategies in the Caatinga, a seasonally dry tropical forest in northeast Brazil

Wright

Lima

Souza

et al. 2021

Ecology and Evolution

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In seasonally dry tropical forests, plant functional type can be classified as deciduous low wood density, deciduous high wood density, or evergreen high wood density species. While deciduousness is often associated with drought‐avoidance and low wood density is often associated with tissue water storage, the degree to which these functional types may correspond to diverging and unique water use strategies has not been extensively tested. We examined (a) tolerance to water stress, measured by predawn and mid‐day leaf water potential; (b) water use efficiency, measured via foliar δ13C; and (c) access to soil water, measured via stem water δ18O. We found that deciduous low wood density species maintain high leaf water potential and low water use efficiency. Deciduous high wood density species have lower leaf water potential and variable water use efficiency. Both groups rely on shallow soil water. Evergreen high wood density species have low leaf water potential, higher water use efficiency, and access alternative water sources. These findings indicate that deciduous low wood density species are drought avoiders, with a specialized strategy for storing root and stem water. Deciduous high wood density species are moderately drought tolerant, and evergreen high wood density species are the most drought tolerant group. Synthesis. Our results broadly support the plant functional type framework as a way to understand water use strategies, but also highlight species‐level differences.

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“…For all vegetation scenarios (potential, contemporary, and future) except those above 60°N (described below), we estimated biome‐specific rooting depths by assigning rooting depth functions derived from empirical data compiled in the Fine Root Ecology Database (FRED) and the National Ecological Observatory Network (NEON) database (Iversen et al., 2021; NEON, 2021). These data sets have recently expanded rooting depth knowledge beyond earlier works (e.g., Jackson et al., 1996; Schenk & Jackson, 2005; Zeng, 2001) by accumulating new datapoints detailing root trait and distribution patterns in diverse biomes (Andrade et al., 2020; Krasowski et al., 2018; Lozanova et al., 2019; Montagnoli et al., 2018). However, to date no one has harmonized and analyzed these data sets to produce equations describing global rooting depth distributions.…”

Section: Methodsmentioning

confidence: 99%

Global‐Scale Shifts in Rooting Depths Due To Anthropocene Land Cover Changes Pose Unexamined Consequences for Critical Zone Functioning

et al. 2022

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Rooting depth is an ecosystem trait that determines the extent of soil development and carbon (C) and water cycling. Recent hypotheses propose that human‐induced changes to Earth's biogeochemical cycles propagate deeply into Earth's subsurface due to rooting depth changes from agricultural and climate‐induced land cover changes. Yet, the lack of a global‐scale quantification of rooting depth responses to human activity limits knowledge of hydrosphere‐atmosphere‐lithosphere feedbacks in the Anthropocene. Here we use land cover data sets to demonstrate that root depth distributions are changing globally as a consequence of agricultural expansion truncating depths above which 99% of root biomass occurs (D99) by ∼60 cm, and woody encroachment linked to anthropogenic climate change extending D99 in other regions by ∼38 cm. The net result of these two opposing drivers is a global reduction of D99 by 5%, or ∼8 cm, representing a loss of ∼11,600 km3 of rooted volume. Projected land cover scenarios in 2100 suggest additional future D99 shallowing of up to 30 cm, generating further losses of rooted volume of ∼43,500 km3, values exceeding root losses experienced to date and suggesting that the pace of root shallowing will quicken in the coming century. Losses of Earth's deepest roots—soil‐forming agents—suggest unanticipated changes in fluxes of water, solutes, and C. Two important messages emerge from our analyses: dynamic, human‐modified root distributions should be incorporated into earth systems models, and a significant gap in deep root research inhibits accurate projections of future root distributions and their biogeochemical consequences.

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Rainfall Regime on Fine Root Growth in a Seasonally Dry Tropical Forest

Cited by 4 publications

References 30 publications

Root biomass under different soil uses and native Cerrado in Tocantins, Brazil

Root biomass under different soil uses and native Cerrado in Tocantins, Brazil

Plant functional types broadly describe water use strategies in the Caatinga, a seasonally dry tropical forest in northeast Brazil

Global‐Scale Shifts in Rooting Depths Due To Anthropocene Land Cover Changes Pose Unexamined Consequences for Critical Zone Functioning

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