Soil N, P, and C dynamics of upland and seasonally flooded forests of the Brazilian Pantanal

Vourlitis, George L.; Hentz, C. S.; Pinto, Osvaldo Borges; Carneiro, Edna; Nogueira, José de Souza

doi:10.1016/j.gecco.2017.11.004

Cited by 20 publications

(31 citation statements)

References 40 publications

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“…Hydrological variation was an apparently important source of variation for Δ C w , but the lack of a statistically significant F × C ANCOVA interaction (Table ) supports the hypothesis that relationships between Δ C w and nutrient availability were not affected by differences in hydrology. This result was surprising given that a hyperseasonal hydrology, which is defined as seasonal flooding followed by drought, can cause large variations in nutrient availability (Vourlitis et al, ) and leaf photosynthesis for many cerrado trees (Dalmagro et al, ; Dalmolin et al, ). However, in a survey of nearly 60 forest sites across the Amazon Basin, Quesada et al () found that differences in soil fertility were more important than soil anoxia in explaining stand differences in Δ C w .…”

Section: Discussionmentioning

confidence: 99%

“…Relationships between nutrient availability and C w or Δ C w were quantified using analysis of covariance (ANCOVA) because nutrient availability may be dependent on stand hydrology (Vourlitis et al, , ). A mixed‐model analysis of variance was run first, where soil or leaf nutrient variables were treated as covariates (C), flooding (F) was treated as a fixed‐effect, and the F × C interaction was calculated to assess whether the effect of nutrient availability on average C w or Δ C w was affected by flooding (factor and error degrees of freedom [ df ] = 1 and 5, respectively).…”

Section: Methodsmentioning

confidence: 99%

“…There is also a paucity of data on aboveground wood C storage, especially from seasonally flooded forests (Sjögersten et al, 2014). Thus, given the potential for variation in hydrology to interact with C storage (Dalmagro et al, 2014(Dalmagro et al, , 2016 and nutrient availability (Vourlitis et al, , 2017, we were interested in seeing if patterns of aboveground wood C storage were correlated with nutrient availability and if these relationships were affected by stand hydrology.…”

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variations in Aboveground Woody Carbon Storage for Cerrado Forests and Woodlands of Mato Grosso, Brazil

et al. 2019

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Tropical forests and savanna account for nearly 65% of the total global terrestrial net primary production (NPP); however, there are still large uncertainties in tropical forest NPP because of limited field measurements, especially in the structurally diverse Brazilian savanna (cerrado). To address this uncertainty, we measured patterns of aboveground wood C stocks (C w ) and rates of wood C storage (ΔC w ) over a 7-year period for cerrado forests and woodlands of southern Mato Grosso, Brazil, arrayed across hydrological and soil fertility gradients. We focused on ΔC w because it is an important component of NPP, and wood is a stable, long-term, C storage reservoir. Annual rates of ΔC w were significantly affected by estimates of P and cation (K and Ca) availability, and analysis of covariance indicated that relationships between ΔC w and nutrient availability were independent of stand hydrology. Both upland and hyperseasonal stands exhibited a decline in ΔC w during the 2015-16 El Niño event, which was exceptionally warm and dry. A limited analysis of the uncertainty associated with the field measurements ranged from 7% for wood density to 24% for tree density, while the uncertainty associated with derived quantities ranged from 10% for tree height to 41% for C w . Overall, these results suggest that soil fertility and annual precipitation are important drivers of ΔC w and that warming and drying associated with climate change will cause a decline in aboveground woody C storage for these, and similar, tropical forests and woodlands.Plain Language Summary Tropical forests and savannas are important reservoirs for global carbon (C) storage, but there are still uncertainties in how much C is stored in these ecosystems, especially for savanna. We measured the amount and rate of C stored in aboveground wood for forests and woodlands of the Brazilian savanna in the southern part of the Amazon Basin. Rates of wood C storage increased as nutrient availability increased, and C storage declined during drought years for both seasonally flooded and non-flooded forests and woodlands. These results have implications for how climate and land-use change alter wood C storage in these globally important ecosystems.

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Section: Discussionmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Spatial and Temporal Variations in Aboveground Woody Carbon Storage for Cerrado Forests and Woodlands of Mato Grosso, Brazil

et al. 2019

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“…These conditions are broadly similar to lowland forests of the Amazon River floodplain, and many of the tree species found in the Pantanal forests are native to the Amazon Basin, making the results described here applicable to other tropical floodplain forests [9,16,34,35]. Forests arrayed across this hydrologic gradient exhibit large differences in aboveground biomass and litter production but, interestingly, seasonally flooded and upland forests share many of the same tree species [36][37][38]. Furthermore, this region is sensitive to human impacts, and climate change has been intensifying and altering hydrology [39].…”

Section: Introductionmentioning

confidence: 53%

“…The field experiment was conducted at two stands within Baía das Pedras, a seasonally flooded gallery forest and an upland forest that were located on flat, level terrain at an elevation of about 125 m above sea level and separated by approximately 200 m [37]. Both forests were composed of 7-15 m tall trees and had a closed canopy with minimal understory vegetation [41].…”

Section: Study Areamentioning

confidence: 99%

Interactions between Vegetation, Hydrology, and Litter Inputs on Decomposition and Soil CO2 Efflux of Tropical Forests in the Brazilian Pantanal

Pinto

Vourlitis

Carneiro

et al. 2018

Forests

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Climate change has the capacity to alter water availability and the litter production of tropical forests, which will alter rates of carbon (C) cycling and storage. We conducted a short-term field experiment in two hydrologically diverse forests in the Brazilian Pantanal to assess the initial response of litter decomposition and soil respiration (Rsoil) to variations in litter pool size. Total annual Rsoil and decomposition significantly declined with litter removal and increased with litter addition, but the rate of litter decomposition was highest for plots where litter was removed. Rsoil was positively related to soil organic matter content and the rate of litter decomposition, but not soil moisture or temperature, suggesting that the litter treatment effects on decomposition and Rsoil were due to changes in C availability and not litter effects on the soil environment (i.e., temperature and moisture). Rsoil was not significantly different between the forests studied here even though they had large differences in hydrology; however, litter decomposition was significantly higher in seasonally flooded forest, especially when augmented with litter. These results suggest that alterations in litter production from land use and/or climate change will alter short-term rates of decomposition and Rsoil for these and other floodplain forests of the Pantanal and Amazon Basin.

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Soil phosphorus loss increases under drought-flood abrupt alternation in summer maize planting area

Weng

Yan

et al. 2022

Agricultural Water Management

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Soil N, P, and C dynamics of upland and seasonally flooded forests of the Brazilian Pantanal

Cited by 20 publications

References 40 publications

Spatial and Temporal Variations in Aboveground Woody Carbon Storage for Cerrado Forests and Woodlands of Mato Grosso, Brazil

Spatial and Temporal Variations in Aboveground Woody Carbon Storage for Cerrado Forests and Woodlands of Mato Grosso, Brazil

Interactions between Vegetation, Hydrology, and Litter Inputs on Decomposition and Soil CO2 Efflux of Tropical Forests in the Brazilian Pantanal

Soil phosphorus loss increases under drought-flood abrupt alternation in summer maize planting area

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