Impact of the conversion of Brazilian woodland savanna (cerradão) to pasture and Eucalyptus plantations on soil nitrogen mineralization

López-Poma, Rosário; Pivello, Vânia Regina; Brito, Gisele Silveira de; Bautista, Susana

doi:10.1016/j.scitotenv.2019.135397

Cited by 18 publications

(11 citation statements)

References 73 publications

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“…The grown pasture may be repeatedly burned to remove unwanted weeds and used for ranches (Neill et al 2001(Neill et al , 2017. If fertilizers are not added to pasture lands, nutrient stocks in the soil may gradually decline from the original stock in primary forests (Hattori et al 2019;López-Poma et al 2020). Because of deforestation and conversion to pasture, the primary production and standing stock of biomass are decreasing globally on tropical lands (Erb et al 2016).…”

Section: Pastures and Ranchesmentioning

confidence: 99%

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

2021

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Tropical primary forests have been disappearing quickly to make use of the land for commercial purposes. Land-use change has an impact on downstream aquatic processes, but those impacts have mainly been studied in temperate climate regions. The present article reviews the impacts of various tropical land-use changes caused by human activities on downstream riverine and estuarine water properties and biogeochemical cycles, focusing especially on the behaviors of nitrogen (N) and phosphorus (P). Logging of tropical primary forests, subsequent establishment of pasture lands, and occasional wildfire or intentional burning have decreased terrestrial N fixation and increased the discharge of P combined with soils, which has lowered the N:P ratio of dissolved inorganic nutrients in the adjacent stream waters and downstream rivers. Agricultural fertilizers and aquacultural practices basically cause nutrient enrichment in downstream riverine and estuarine waters, changing the N:P ratio depending on the source. Finally, urbanization causes eutrophication in many tropical estuaries, where a halocline forms easily because of a warm temperature throughout the year and the water at the bottom of the estuary tends to become hypoxic or anoxic. Overall, the impact of land-use change on aquatic processes may be more serious in tropical regions than in temperate or cold climate regions because of (1) a higher biomass and nutrient stock in original tropical forests; (2) higher precipitation, more frequent episodic flooding, and warmer temperatures in tropical regions; and (3) certain practices that are rapidly expanding in tropical regions such as land-based aquaculture. Various land-use changes are causing downstream nutrient enrichment or disturbance of the nutrient balance at tropical land-sea interfaces, and the overall N:P ratios in the aquatic ecosystem seem to be declining. Nonetheless, if proper management is conducted and the discharge of nutrients and soils ceases, tropical aquatic systems may have the potential to recover faster than those in other climate regions because of their abundant precipitation and warm temperature. Long-term monitoring and more attention to elemental stoichiometry are important areas for future research.

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Section: Pastures and Ranchesmentioning

confidence: 99%

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

2021

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“…Estimates of C stocks in the Cerrado, especially belowground, are scarce and highly variable, across different Cerrado physiognomies and soil depths (Paiva and Faria 2007;Maquère et al 2008;Neto et al 2010;Fidelis et al 2013;Oliveras et al 2013;Brito et al 2019). Similarly, there are few estimates of N stocks in Cerrado ecosystems, which point to a much higher concentration in the rst 50 cm soil layer (Bustamante et al 2006;López-Poma et al 2020). However, the effects caused by biological invasions in the Cerrado C and N stocks have not been reported to this moment, and this is a vital issue especially in times of global warming and changes in the natural ecological cycles.We compared C stocks aboveground, and C and N stocks belowground along the soil pro le between an uninvaded open cerrado and a site invaded by the African grass U. decumbens.…”

Section: Discussionmentioning

confidence: 99%

Can an invasive African grass affect carbon and nitrogen stocks in open habitats of the Brazilian Cerrado?

Garcia

Xavier

Camargo

et al. 2022

Flora

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Section: Discussionmentioning

confidence: 99%

Can an invasive African grass affect carbon and nitrogen stocks in open habitats of the Brazilian Cerrado?

Garcia

Xavier

Camargo

et al. 2021

Preprint

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Considering the emergence of ecosystems dominated by invasive species, there is growing interest in estimating the effect of biological invasions in ecosystem processes and provision of services. African grasses are the most invasive plants in the Cerrado (Brazilian savanna), but their impact on C and N stocks is poorly known. We compared patterns of C and N stocks in the aboveground biomass, root biomass and soil in open Cerrado (campo sujo) sites, both uninvaded and invaded by the African grass Urochloa decumbens. In both sites we estimated the aboveground biomass of U. decumbens and native grasses, as well as the root biomass up to 50 cm. We obtained C and N contents in the soil, as well as C and N stocks, up to 1 m depth, and variation in soil δ13C and δ15N. Although invasion did not affect the aboveground biomass, it did affect belowground biomass, leading to higher C stock in fine roots and soil N content close to soil surface, as well as higher C content along the soil profile. C and N soil stocks, soil δ13C and δ15N values did not significantly differ between invaded and uninvaded site. Even a relatively low level of invasion by U. decumbens changed the root distribution pattern and increased C and N contents in the upper soil, which may promote ecosystem changes by altering nutrient dynamics. Although still preliminary, our study shows that dominance by U. decumbens can have severe effects in the Cerrado belowground environment.

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Impact of the conversion of Brazilian woodland savanna (cerradão) to pasture and Eucalyptus plantations on soil nitrogen mineralization

Cited by 18 publications

References 73 publications

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

The impact of tropical land-use change on downstream riverine and estuarine water properties and biogeochemical cycles: a review

Can an invasive African grass affect carbon and nitrogen stocks in open habitats of the Brazilian Cerrado?

Can an invasive African grass affect carbon and nitrogen stocks in open habitats of the Brazilian Cerrado?

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