‘Cerrado’, old and new agricultural frontiers

Pires, Mauro Oliveira

doi:10.1590/1981-3821202000030006

Cited by 19 publications

(9 citation statements)

References 9 publications

(4 reference statements)

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“…Here again, pixels belonging to the Cerrado biome in the Brazilian region (green dots in Figure 4b,d, right column) show a wide spread of increasing and decreasing PET/AET pixels, indicating that there is no significant global trend over this specific biome. However, it is important to note that pixels corresponding to the Cerrado biome region with high values of RNF but no significant AET decrease could be explained by the fact that this region has a high rate of agricultural production (Reis et al ., 2017; Pires, 2020). Therefore, the expansion and intensification of irrigated agriculture that was identified in the Cerrado region is likely to influence the AET values (Arantes et al ., 2016; Spera et al ., 2016).…”

Section: Resultsmentioning

confidence: 99%

A regional view of the linkages between hydro‐climatic changes and deforestation in the Southern Amazon

Wongchuig

Espinoza

Condom

et al. 2021

Intl Journal of Climatology

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In the last four decades, the Southern Amazon (south of 8 S) has shown changes in the spatial and temporal patterns of its hydro-climatic components, leading to drier conditions. Due to climate and land-use changes, this region is considered as a zone under biophysical transition processes. Previous studies have documented a complex interaction between climate and deforestation either on a large-scale or based on limited in situ data, typically covering the Brazilian Amazon. In this study, we analyse the relationships between hydro-climate, the surface waterenergy partitioning and an index of regional forest cover change for the period 1981-2018. Additionally, we discretized three regions covering the Bolivian Amazon and the southern portions of the Peruvian and Brazilian Amazon due to their differences in the evolution of land use. In the Bolivian region, a high ratio of forest cover change, exceeding 40-50%, is related to a significant tendency to become water-limited. This change is associated with decreased rainfall, increased potential evapotranspiration and decreased actual evapotranspiration. Regardless of the region analysed, those that are characterized by a high ratio of forest cover change (>40-50%) show growing imbalance between increasing potential and decreasing actual evapotranspiration. However, in the Peruvian and Brazilian regions, hydroclimatic conditions remain energy-limited due to minor rainfall changes. The observed differences in surface water-energy partitioning behaviour evidence a complex dependence of both sub-regional (i.e., land cover changes) and large-scale (i.e., strengthening of the Walker and Hadley circulations) conditions. Our findings indicate a clear link between hydro-climatic changes and deforestation, providing a new perspective on their spatial variability on a sub-regional scale.

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Section: Resultsmentioning

confidence: 99%

A regional view of the linkages between hydro‐climatic changes and deforestation in the Southern Amazon

Wongchuig

Espinoza

Condom

et al. 2021

Intl Journal of Climatology

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“…High rates of deforestation also have been registered for the Tropical Savannas. The Brazilian Cerrado and Dry Chaco biomes are currently considered the most active agricultural frontiers in South America (Baldi et al, 2015;Le Polain de Waroux et al, 2018;M. O. Pires, 2020).…”

Section: Deforestationmentioning

confidence: 99%

Beyond Carbon: The Contributions of South American Tropical Humid and Subhumid Forests to Ecosystem Services

Borma

Costa

Rocha

et al. 2022

Reviews of Geophysics

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Tropical forests are key habitats for diverse organisms, and because of their wide global distribution, rich biodiversity, and long history of human use, they are also essential for providing a wide range of ecosystem services (ESs;Brandon, 2015; Brockerhoff et al., 2017;Gibson et al., 2011;Mori et al., 2017). Considerable attention has been devoted to tropical forests and their role as a natural climate solution for mitigating climate change. It is estimated that about 30% of all CO 2 emitted by human activities is removed from the atmosphere by these forests (Le Quéré et al., 2018). The important role of tropical forests as a carbon sink and stock has historically guided conservation pacts, programs, and policies for establishing targets associated with carbon storage and climate change mitigation. This role was important in developing several articles of the 1997 Kyoto Protocol (Swingland et al., 2002) and explicit policies for reducing emissions from deforestation and forest degradation through the REDD+ agreement (Pistorius, 2012). Several countries also set ambitious goals for restoring forests to reduce emissions or sequester carbon in the United Nations Framework Convention on Climate Change 2015 Paris Agreement. The land use, land cover change, and forestry (LULCCF) sector is included in many countries' first nationally determined contributions (NDCs) but with differing levels of specificity. Assuming full implementation of NDCs, Grassi et al. (2017) show that land use-and forests, in particular-emerges as a key component of the Paris Agreement: global land use will turn from a net anthropogenic source during 1990-2010 (1.3 ± 1.1 Gt CO 2 e yr −1 ) to a net sink of carbon by 2030 (up to −1.1 ± 0.5 Gt CO 2 e yr −1 ) and would provide a quarter of countries' planned emission reductions. Two tropical countries stand out regarding the magnitude of the LULCCF contribution: Brazil set ambitious goals of reducing greenhouse gas emissions by 43% by 2030 with

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“…Here again, pixels belonging to the Cerrado biome in the Brazilian region (green dots in Figure 4b,d, right column) show a wide spread of increasing and decreasing PET/AET pixels, indicating that there is no significant global trend over this specific biome. However, it is important to note that pixels corresponding to the Cerrado biome region with high values of RNF but no significant AET decrease could be explained by the fact that this region has a high rate of agricultural production (Reis et al, 2017;Pires, 2020). Therefore, the expansion and intensification of irrigated agriculture that was identified in the Cerrado region is likely to influence the AET values (Arantes et al, 2016;Spera et al, 2016).…”

Section: Pet and Aetmentioning

confidence: 99%

A regional view of the linkages between hydro-climatic changes and deforestation in the Southern Amazon

Wongchuig

Espinoza

Condom

et al. 2021

Preprint

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Linking the Amazonian deforestation to changes in the hydrological cycle remains a puzzling question, addressed here through the use of recent global databases analyzing the relations between key hydro-climate variables (Precipitation (P), potential and actual evapotranspiration (PET and AET, respectively)), the surface water-energy balance and indices of forest cover change (regional forest loss ratio -RFL and regional non-forest vegetation ratio -RNF) for Southern Amazon (south of 8&#176;S) and over the 1981-2018 period. The Southern Amazon constitutes a peculiar region due to specific climatic characteristics and shows a higher significant deforestation rate in comparison with the Northern Amazon. We further subdivided the study region into three subregions called Southern Bolivian Amazon (15&#176; S&#8210;21&#176; S, 57&#176; W&#8210;70&#176; W), Southern Peruvian Amazon (8&#176; S&#8210;15&#176; S, 77&#176; W&#8210;65&#176; W) and Southern Brazilian Amazon (8&#176; S&#8210;15&#176; S, 65&#176; W&#8210;50&#176; W). The surface water-energy balance is analyzed using a pixel-based Budyko-like theoretical framework approach, which discriminates energy-limited regions from water-limited regions. Southern Bolivian Amazon is shown to have undergone the strongest forest transition, becoming water-limited in conjunction with high forest loss. In this region, there is a significant relation between RFL values above 40%, P decrease, PET increases and AET decrease. These results suggest that areas with RNF values higher than 40% are prone to shift from an energy-limited to a water-limited state and remain trapped in this new state. Regions further north remain energy-limited due to minor P changes and even though significant increases in PET and decreases in AET are observed, associated with deforestation (high values RFL). This is typically the case in the &#8216;Arc of Deforestation&#8217;. In the Southern Bolivian Amazon, land use transition is associated with much larger changes from closed forest to a low-tree cover state as compared to regions further north - by at least a factor three as a proportion of area. Our findings indicate a clear link between hydro-climatic changes and deforestation, providing a new perspective on their spatial variability on a regional scale.&#160;This research is part of the French AMANECER-MOPGA project.

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‘Cerrado’, old and new agricultural frontiers

Cited by 19 publications

References 9 publications

A regional view of the linkages between hydro‐climatic changes and deforestation in the Southern Amazon

A regional view of the linkages between hydro‐climatic changes and deforestation in the Southern Amazon

Beyond Carbon: The Contributions of South American Tropical Humid and Subhumid Forests to Ecosystem Services

A regional view of the linkages between hydro-climatic changes and deforestation in the Southern Amazon

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