Anthropogenic and climatic influences in the swamp environment of the Pandeiros River basin, Minas Gerais-Brazil

Santos, Gilsonley Lopes dos; Pereira, Marcos Gervásio; Delgado, Rafael Coll; Magistrali, Iris Cristiane; Silva, Claudio Gomes da; Oliveira, Carlos Magno Moreira de; Teodoro, Paulo Eduardo

doi:10.1007/s10661-020-8192-7

Cited by 5 publications

(6 citation statements)

References 29 publications

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“…geographic distribution in the neotropics and inhabits diverse well-illuminated habitats, including waterlogged, hypoxic soils, in which the main available N source is NH 4 + (dosSantos et al, 2020).Our results further reinforced the plasticity of C. pachystachya in the…”

supporting

confidence: 75%

“…Cecropia pachystachya also shows a relatively high tolerance to NH 4 + when compared to other shade‐intolerant species (Oliveira et al, 2017). Indeed, it has a wide geographic distribution in the neotropics and inhabits diverse well‐illuminated habitats, including waterlogged, hypoxic soils, in which the main available N source is NH 4 + (dos Santos et al, 2020). Our results further reinforced the plasticity of C. pachystachya in the use of NO 3 − and NH 4 + .…”

Section: Discussionmentioning

confidence: 99%

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Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Debiasi

Calzavara

Sodek

et al. 2021

Physiologia Plantarum

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Environmental conditions influence the use of different nitrogen (N) sources by plants. We hypothesized that an increase in light intensity favors the use of nitrate (NO 3 À ) relative to ammonium (NH 4 + ) by seedlings of neotropical tree species from different functional groups, that is, Cecropia pachystachya (a shade-intolerant species), Cariniana estrellensis (a shade-tolerant canopy species), and Guarea kunthiana (a shade-tolerant understory species). We analyzed the growth and N metabolism in seedlings simultaneously provided with NH 4 + and NO 3 À , under lower (LL) and higher (HL) light intensity. 15 N incorporation into amino acids was monitored after incubation with 15 N-labeled NH 4 + or NO 3 À . Under HL, all species showed decreased leaf area ratio, and increased growth, nitrate reductase activity and assimilated N content. Cecropia pachystachya increased the use of both N sources under HL, with substantial increases in 15 N-amino acids derived from 15 NO 3 À (12.5-and 4.0-fold in roots and leaves, respectively) and 15 NH 4 + (4.5-and 3.0-fold in roots and leaves, respectively). Guarea kunthiana showed the greatest plasticity in N use, as the assimilation of 15 NO 3 À in roots and leaves increased substantially under HL (11.2-and 17.0-fold, respectively). Cariniana estrellensis increased the assimilation of 15 NH 4 + in roots and 15 NO 3 À in leaves under HL. Therefore, the responses of N use strategies to light intensity varied with the species according to their ecological characteristics.

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supporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Debiasi

Calzavara

Sodek

et al. 2021

Physiologia Plantarum

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“…Studies suggest an increase in the intensity and frequency of droughts by the end of the century worldwide due to atmospheric evaporative demand increases, reducing water availability, soil water storage, and agricultural production [15,33,34]. Yet, Santos et al [35] observed a reduction in the water table in the PRB wetlands, downstream of the streamflow gauge station of this study, due to a The most significant meteorological droughts occurred during the hydrological years of 1986/87, 1994/95, 1995/96, 1997/98, 2007/08, and between 2014/15 and 2016/17 in the PRB. Similar behavior was observed for the rainy season, however, with some differences concerning intensity.…”

Section: Meteorological and Hydrological Droughtsmentioning

confidence: 99%

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

et al. 2020

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The Brazilian savanna is one of the world’s 25 biodiversity hotspots. However, droughts can decrease water availability in this biome. This study aimed to analyze meteorological and hydrological droughts and their influence on the hydrological behavior in a Brazilian savanna basin. For that, hydrological indicators were calculated to analyze the hydrological behavior in the Pandeiros river basin (PRB). The Standardized Precipitation Index (SPI) and Standardized Streamflow Index (SSI) were calculated for the hydrological year and rainy season from 1977 to 2018. The propagation of the meteorological to hydrological drought was studied by means of the Pearson coefficient of correlation between the SSI and SPI with 0, 3, 6, 9, and 12-month lags. A longer meteorological drought was observed from 2014/15 to 2017/18 which caused a reduction in the groundwater recharge, besides potentially reducing the ecological functions of the Brazilian savanna. This drought was intensified by an increase in the average annual temperature, resulting in the increasing of evapotranspiration. Regarding drought propagation, there is no significant difference among the coefficients of correlation from 0 to 6-month lags. For the lags of 9 and 12 months, the correlation decreases, indicating a greater influence of the current rainy season than the past ones.

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“…The regional geomorphology is of flattened surfaces, shallow valleys, and isolated residual hills. These are typical geomorphological features of the São Francisco depression (Santos et al, 2020). Hypsometry ranges from 449 to 846 m, with higher areas to the north.…”

Section: Study Areamentioning

confidence: 86%

“…In the downstream portion of the Pandeiros River, there is an extensive humid area, forming a vast swamp, the only one in the state of Minas Gerais (SANTOS et al, 2020). As it is a constantly humid area, the ETR values are high, and there is no significant variation in the periods (with 2.93 to 4.28 mm d -1 in winter and 6.24 to 8 mm d -1 in summer).…”

Section: Spatial Distribution Of Evapotranspirationmentioning

confidence: 99%

Estimativa da Perda de Água Na APA do Rio Pandeiros, Minas Gerais

Silva¹,

Souza

Leite

et al. 2020

Cad. Geogr.

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A evapotranspiração (ETR) varia conforme o uso da terra, período do ano, e pode influenciar no regime hidrológico de uma área. O objetivo foi analisar em série temporal (verão e inverno) as taxas de ETR em bacia hidrográfica, situada no Bioma Cerrado, em condição climática Subúmido-Seco. Utilizamos o algoritmo SEBAL (Surface Energy Balance Algorithm for Land) para estimar a ETR por imagem de satélite Landsat-8, no período de verão e inverno. Selecionamos áreas de oito classes de uso da terra (Cerradão, Cerrado ralo, Mata Seca, Cerrado degradado pelo fogo, irrigação com pivô, pastagem, eucalipto e Veredas). Analise de Componente Principal (PCA) foi aplicada para observar a relação dos usos com outras variáveis (índice de área foliar, índice de área foliar, fluxo de calor sensível, fluxo de calor latente, resistência aerodinâmica, saldo de radiação, e altitude) por. A ETR varia conforme época do ano, com maior ETR no verão, e as maiores médias ocorrem nas áreas de eucalipto (7,5 mm d-1) e veredas (7,2 mm d-1). O cerrado ralo, uso predominante na bacia, possui menor ETR (2,5 mm d-1 / verão), e a conversão destas áreas para usos antrópicos implica no aumento de ETR. A PCA indicou que os usos, alteram a ETR devido ao estado fenológico da planta, e baseado nas condições climáticas. Há indicativo que os reflorestamentos com eucalipto, em áreas de recarga pode afetar negativamente o regime hídrico da bacia em virtude do aumento da ETR.

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Anthropogenic and climatic influences in the swamp environment of the Pandeiros River basin, Minas Gerais-Brazil

Cited by 5 publications

References 29 publications

Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Nitrogen use plasticity in response to light intensity in neotropical tree species of distinct functional groups

Hydrological Response to Drought Occurrences in a Brazilian Savanna Basin

Estimativa da Perda de Água Na APA do Rio Pandeiros, Minas Gerais

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