Unraveling the ecosystem functions in the Amazonia–Cerrado transition: evidence of hyperdynamic nutrient cycling

Oliveira, Beatriz Fátima Alves de; Marimon, Ben Hur; Mews, Henrique Augusto; Valadão, Marco Bruno Xavier

doi:10.1007/s11258-016-0681-y

Cited by 30 publications

(34 citation statements)

References 47 publications

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“…For example, nutrient cycling in the Amazon-Cerrado transition region is closely related to the hyper-dynamic turnover of AGB . Vegetation sustains the constant input of nutrients, including large annual amounts of available P, and in fact some key species might be crucial to the hyper-cycling of nutrients (Oliveira et al, 2017). In addition, weather can affect nutrient fluxes: intense rain can leach nutrients such as nitrogen and strong winds can transport clay particles on which nutrients are adsorbed.…”

Section: Discussionmentioning

confidence: 99%

“…The Amazon-Cerrado border is the result of the expansion and contraction of the Cerrado into the forest (see Marimon et al, 2006;Morandi et al, 2016), especially in Mato Grosso state where extreme events, such as intense droughts, influence the vegetation dynamics (Marimon et al, 2014) and the nutrient (Oliveira et al, 2017) and carbon cycling .…”

Section: Introductionmentioning

confidence: 99%

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Influence of climate variability, fire and phosphorus limitation on vegetation structure and dynamics of the Amazon–Cerrado border

et al. 2018

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Abstract. Climate, fire and soil nutrient limitation are important elements that affect vegetation dynamics in areas of the forest-savanna transition. In this paper, we use the dynamic vegetation model INLAND to evaluate the influence of interannual climate variability, fire and phosphorus (P) limitation on Amazon-Cerrado transitional vegetation structure and dynamics. We assess how each environmental factor affects net primary production, leaf area index and aboveground biomass (AGB), and compare the AGB simulations to an observed AGB map. We used two climate data sets (monthly average climate for 1961-1990 and interannual climate variability for 1948-2008), two data sets of total soil P content (one based on regional field measurements and one based on global data), and the INLAND fire module. Our results show that the inclusion of interannual climate variability, P limitation and fire occurrence each contribute to simulating vegetation types that more closely match observations. These effects are spatially heterogeneous and synergistic. In terms of magnitude, the effect of fire is strongest and is the main driver of vegetation changes along the transition. Phosphorus limitation, in turn, has a stronger effect on transitional ecosystem dynamics than interannual climate variability does. Overall, INLAND typically simulates more than 80 % of the AGB variability in the transition zone. However, the AGB in many places is clearly not well simulated, indicating that important soil and physiological factors in the Amazon-Cerrado border region, such as lithology, water table depth, carbon allocation strategies and mortality rates, still need to be included in the model.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of climate variability, fire and phosphorus limitation on vegetation structure and dynamics of the Amazon–Cerrado border

et al. 2018

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“…Ongoing long-term (>12 years) ecological research has indicated above-average tree mortality and diversity loss in seasonally flooded forests due to fire (da Silva et al, 2018;Maracahipes et al, 2014). Fire disturbance can disrupt biological processes and biogeochemical cycles, notably those concerning N (Pellegrini et al, 2018), which can influence natural succession in dystrophic, nutrient-poor soils (de Oliveira et al, 2017;Nardoto et al, 2014;Taylor et al, 2019). For example, the effect of fire includes transformations of the soil organic and inorganic pools with subsequent loss through volatilization or via export of particulate matter (Certini, 2005;Crutzen & Andreae, 2016;Dionizio et al, 2018;Mataix-Solera et al, 2011;Schlesinger et al, 2016).…”

Section: Introductionmentioning

confidence: 99%

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

et al. 2020

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In this study, we investigate the biogeochemical consequences of fire in seasonally flooded Amazon forests, where recent declines in forest cover have been linked to increases in fire frequency and severity. Previous studies have hypothesized that a quasi‐permanent state‐shift transition from typical Amazon forests to open savannas can occur when fire results in further depletion of already impoverished soil nutrient pools. Asymbiotic N2 fixation (ANF) is an essential pathway for fire‐affected forests to acquire nitrogen (N) after disturbance, but ANF response to fire has yet to be quantified in Amazonia. Here, we quantify ANF through field sampling and laboratory incubations using 15N‐labeled dinitrogen (15N2) and measurement of 14 biogeochemical parameters in surface (0–10 cm) and subsurface (10–30 cm) soils. Our data represent burned and unburned replicated sampling sites, across five stands, spanning a gradient from infrequent (once in 13 years) to frequent (five times in 13 years) fire occurrences. ANF did not vary with fire frequency but was, on average, 24% lower in burned than in unburned surface soils across all stands. Burned and unburned subsurface soils had similar ANF rates. About 58% of ANF variance was explained by the joint effect of carbon (C):N ratio and available phosphorus (P) in burned and unburned soils. ANF increased linearly with C:N and P availability in unburned soils, but a highly non‐linear relationship was observed in burned soils. Our findings show that fire alters soil C‐to‐nutrient stoichiometry, which resulted in lower N inputs via ANF into burned relative to unburned tropical forest soils.

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“…Additionally, the recent unprecedented rise in atmospheric carbon dioxide is expected to favor C3 plants over C4 grasses, as more CO2 may preferentially increase the water use efficiency of C3 plants (Phillips et al 2009;Kerbauy 2012). These multiple factors may impact the species composition (Khavhagali and Bond 2008), structural dynamics, density of individuals, basal area, aboveground biomass (Phillips et al 2009;Marimon et al 2014;Morandi et al 2015), occurrence of fire-tolerant plants (Miranda et al 2002;Henriques 2005) and vegetation encroachment (Khavhagali and Bond 2008), and contribute to the high biodiversity of the region (Marimon et al 2014;Oliveira et al 2016).…”

Section: Introductionmentioning

confidence: 99%

Savanna turning into forest: concerted vegetation change at the ecotone between the Amazon and “Cerrado” biomes

Passos¹,

Marimon

Phillips

et al. 2018

Braz. J. Bot

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In the Cerrado-Amazon ecotone in central Brazil, recent studies suggest some encroachment of forest into savanna, but how, where, and why this might be occurring is unclear. To better understand this phenomenon, we assessed changes in the structure and dynamics of tree species in three vegetation types at the Cerrado-Amazon ecotone that are potentially susceptible to encroachment: open cerrado (OC), typical cerrado (TC) and dense woodland (DW). We estimated changes in density, basal area and aboveground biomass of trees with diameter >10 cm over four inventories carried out between 2008 and 2015 and classified the species according to their preferred habitat (savanna, generalist, or forest). There was an increase in all structural parameters assessed in all vegetation types, with recruitment and gains in basal area and biomass greater than mortality and losses. Thus, there were net gains between the first and final inventories in density (OC: 3.

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Unraveling the ecosystem functions in the Amazonia–Cerrado transition: evidence of hyperdynamic nutrient cycling

Cited by 30 publications

References 47 publications

Influence of climate variability, fire and phosphorus limitation on vegetation structure and dynamics of the Amazon–Cerrado border

Influence of climate variability, fire and phosphorus limitation on vegetation structure and dynamics of the Amazon–Cerrado border

Fire Affects Asymbiotic Nitrogen Fixation in Southern Amazon Forests

Savanna turning into forest: concerted vegetation change at the ecotone between the Amazon and “Cerrado” biomes

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