Water Appropriation on the Agricultural Frontier in Western Bahia and Its Contribution to Streamflow Reduction: Revisiting the Debate in the Brazilian Cerrado
Over the last three decades, almost half of the Brazilian tropical savanna (Cerrado biome) has been converted into cropland and planted pastures. This study aims to understand the implications of the expansion of the agricultural frontier for water resources in western Bahia state. We use an interdi...
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| creator | Silva, Andréa Leme da Souza, Saulo Aires de Coelho Filho, Osmar Eloy, Ludivine Salmona, Yuri Botelho Passos, Carlos José Sousa |
| description | Over the last three decades, almost half of the Brazilian tropical savanna (Cerrado biome) has been converted into cropland and planted pastures. This study aims to understand the implications of the expansion of the agricultural frontier for water resources in western Bahia state. We use an interdisciplinary approach that combines quantitative and qualitative data (spatial and hydrological analysis, interviews) to tie together land use changes in the Corrente basin, the streamflow and precipitation time series in the Pratudão River sub-basin (part of the Corrente basin), and the perceptions of soybean farmers and smallholder communities about the transformations of the hydrological cycle over the last few years. We observed an almost 10-fold increase in agricultural surface area in the Corrente River basin over the last three decades (1986–2018), going on from 57,090 ha to 565,084 ha, while center-pivot irrigated areas increased from 240 ha to 43,631 ha. Over this period, the streamflow has reduced by 38% in the Pratudão River. Our hydrological analyses, based on the Mann-Kendall test, of seven fluviometric stations and 14 pluviometry stations showed a statistically significant streamflow trend in the Pratudão River sub-basin for both minimum and mean streamflow series (p ≤0.05). Surface runoff coefficient, which relates streamflow and precipitation annual data coefficient, decreased from around 0.4 in the late 1990s to less than 0.2 in 2015. In addition, most precipitation time series analysis (number of annual rainy days) showed no statistically significant trend (p > 0.05). Our results indicate that agricultural changes rather than climate change may be the main driver of downward streamflow trends in the Pratudão River sub-basin that is part of Corrente River basin. |
| doi_str_mv | 10.3390/w13081054 |
| format | Article |
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This study aims to understand the implications of the expansion of the agricultural frontier for water resources in western Bahia state. We use an interdisciplinary approach that combines quantitative and qualitative data (spatial and hydrological analysis, interviews) to tie together land use changes in the Corrente basin, the streamflow and precipitation time series in the Pratudão River sub-basin (part of the Corrente basin), and the perceptions of soybean farmers and smallholder communities about the transformations of the hydrological cycle over the last few years. We observed an almost 10-fold increase in agricultural surface area in the Corrente River basin over the last three decades (1986–2018), going on from 57,090 ha to 565,084 ha, while center-pivot irrigated areas increased from 240 ha to 43,631 ha. Over this period, the streamflow has reduced by 38% in the Pratudão River. Our hydrological analyses, based on the Mann-Kendall test, of seven fluviometric stations and 14 pluviometry stations showed a statistically significant streamflow trend in the Pratudão River sub-basin for both minimum and mean streamflow series (p ≤0.05). Surface runoff coefficient, which relates streamflow and precipitation annual data coefficient, decreased from around 0.4 in the late 1990s to less than 0.2 in 2015. In addition, most precipitation time series analysis (number of annual rainy days) showed no statistically significant trend (p > 0.05). Our results indicate that agricultural changes rather than climate change may be the main driver of downward streamflow trends in the Pratudão River sub-basin that is part of Corrente River basin.</description><identifier>ISSN: 2073-4441</identifier><identifier>EISSN: 2073-4441</identifier><identifier>DOI: 10.3390/w13081054</identifier><language>eng</language><publisher>Basel: MDPI AG</publisher><subject>Agribusiness ; Agricultural commodities ; Agricultural land ; Agriculture ; Annual precipitation ; Annual rainfall ; Annual runoff ; Aquatic resources ; Aquifers ; Basins ; Biomes ; Brazil ; Canals ; Climate change ; Climatic changes ; Community ; Data analysis ; Earth Sciences ; Ecosystems ; Environment and Society ; Environmental Sciences ; Farms ; Geography ; Humanities and Social Sciences ; Hydrologic cycle ; Hydrologic data ; Hydrological analysis ; Hydrology ; International economic relations ; Irrigated areas ; Irrigation ; Land use ; Pasture ; Precipitation ; Qualitative analysis ; River basins ; Rivers ; Runoff ; Runoff coefficient ; Savannahs ; Sciences of the Universe ; Seasons ; Small farms ; Soybean ; Soybean industry ; Soybeans ; Spatial analysis ; Spatial data ; Statistical analysis ; Stream discharge ; Stream flow ; Streamflow ; Surface runoff ; Time series ; Trends ; Vegetation ; Water in agriculture ; Water resources ; Water-supply, Agricultural ; Watersheds</subject><ispartof>Water (Basel), 2021-04, Vol.13 (8), p.1054</ispartof><rights>COPYRIGHT 2021 MDPI AG</rights><rights>2021 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.</rights><rights>Distributed under a Creative Commons Attribution 4.0 International License</rights><lds50>peer_reviewed</lds50><oa>free_for_read</oa><woscitedreferencessubscribed>false</woscitedreferencessubscribed><citedby>FETCH-LOGICAL-c368t-4ee403f69432516f51cac49051c8ecd7034cf6864c306f7bee546bf8a77a97a53</citedby><cites>FETCH-LOGICAL-c368t-4ee403f69432516f51cac49051c8ecd7034cf6864c306f7bee546bf8a77a97a53</cites><orcidid>0000-0001-9944-3052 ; 0000-0002-0553-9342 ; 0000-0002-6899-1993</orcidid></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>230,314,780,784,885,27924,27925</link.rule.ids><backlink>$$Uhttps://shs.hal.science/halshs-03196184$$DView record in HAL$$Hfree_for_read</backlink></links><search><creatorcontrib>Silva, Andréa Leme da</creatorcontrib><creatorcontrib>Souza, Saulo Aires de</creatorcontrib><creatorcontrib>Coelho Filho, Osmar</creatorcontrib><creatorcontrib>Eloy, Ludivine</creatorcontrib><creatorcontrib>Salmona, Yuri Botelho</creatorcontrib><creatorcontrib>Passos, Carlos José Sousa</creatorcontrib><title>Water Appropriation on the Agricultural Frontier in Western Bahia and Its Contribution to Streamflow Reduction: Revisiting the Debate in the Brazilian Cerrado</title><title>Water (Basel)</title><description>Over the last three decades, almost half of the Brazilian tropical savanna (Cerrado biome) has been converted into cropland and planted pastures. This study aims to understand the implications of the expansion of the agricultural frontier for water resources in western Bahia state. We use an interdisciplinary approach that combines quantitative and qualitative data (spatial and hydrological analysis, interviews) to tie together land use changes in the Corrente basin, the streamflow and precipitation time series in the Pratudão River sub-basin (part of the Corrente basin), and the perceptions of soybean farmers and smallholder communities about the transformations of the hydrological cycle over the last few years. We observed an almost 10-fold increase in agricultural surface area in the Corrente River basin over the last three decades (1986–2018), going on from 57,090 ha to 565,084 ha, while center-pivot irrigated areas increased from 240 ha to 43,631 ha. Over this period, the streamflow has reduced by 38% in the Pratudão River. Our hydrological analyses, based on the Mann-Kendall test, of seven fluviometric stations and 14 pluviometry stations showed a statistically significant streamflow trend in the Pratudão River sub-basin for both minimum and mean streamflow series (p ≤0.05). Surface runoff coefficient, which relates streamflow and precipitation annual data coefficient, decreased from around 0.4 in the late 1990s to less than 0.2 in 2015. In addition, most precipitation time series analysis (number of annual rainy days) showed no statistically significant trend (p > 0.05). 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Our hydrological analyses, based on the Mann-Kendall test, of seven fluviometric stations and 14 pluviometry stations showed a statistically significant streamflow trend in the Pratudão River sub-basin for both minimum and mean streamflow series (p ≤0.05). Surface runoff coefficient, which relates streamflow and precipitation annual data coefficient, decreased from around 0.4 in the late 1990s to less than 0.2 in 2015. In addition, most precipitation time series analysis (number of annual rainy days) showed no statistically significant trend (p > 0.05). 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| source | Elektronische Zeitschriftenbibliothek - Frei zugängliche E-Journals; MDPI - Multidisciplinary Digital Publishing Institute |
| subjects | Agribusiness Agricultural commodities Agricultural land Agriculture Annual precipitation Annual rainfall Annual runoff Aquatic resources Aquifers Basins Biomes Brazil Canals Climate change Climatic changes Community Data analysis Earth Sciences Ecosystems Environment and Society Environmental Sciences Farms Geography Humanities and Social Sciences Hydrologic cycle Hydrologic data Hydrological analysis Hydrology International economic relations Irrigated areas Irrigation Land use Pasture Precipitation Qualitative analysis River basins Rivers Runoff Runoff coefficient Savannahs Sciences of the Universe Seasons Small farms Soybean Soybean industry Soybeans Spatial analysis Spatial data Statistical analysis Stream discharge Stream flow Streamflow Surface runoff Time series Trends Vegetation Water in agriculture Water resources Water-supply, Agricultural Watersheds |
| title | Water Appropriation on the Agricultural Frontier in Western Bahia and Its Contribution to Streamflow Reduction: Revisiting the Debate in the Brazilian Cerrado |
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