Deforestation and conservation in major watersheds of the Brazilian Amazon

Trancoso, Ralph; Filho, Arnaldo Carneiro; Tomasella, Javier; Schietti, Juliana; Forsberg, Bruce R.; Miller, Robert Pritchard

doi:10.1017/s0376892909990373

Cited by 53 publications

(42 citation statements)

References 39 publications

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“…However, these two indicators were considered important in the semi-arid region Brazil based on the fact that the region has relatively low development indexes and several inadequate land uses practices, and previous studies in other regions of Brazil (Trancoso et al, 2010) have shown that conservation enforcement in protected areas is crucial for avoiding degradation.…”

Section: Resultsmentioning

confidence: 99%

Identifying areas susceptible to desertification in the Brazilian northeast

et al. 2015

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Abstract. Approximately 57 % of the Brazilian northeast region is recognized as semi-arid land and has been undergoing intense land use processes in the last decades, which have resulted in severe degradation of its natural assets. Therefore, the objective of this study is to identify the areas that are susceptible to desertification in this region based on the 11 influencing factors of desertification (pedology, geology, geomorphology, topography data, land use and land cover change, aridity index, livestock density, rural population density, fire hot spot density, human development index, conservation units) which were simulated for two different periods: 2000 and 2010. Each indicator were assigned weights ranging from 1 to 2 (representing the best and the worst conditions), representing classes indicating low, moderate and high susceptibility to desertification. The results indicate that 94 % of the Brazilian northeast region is under moderate to high susceptibility to desertification. The areas that were susceptible to soil desertification increased by approximately 4.6 % (83.4 km 2 ) from 2000 to 2010. The implementation of the methodology provides the technical basis for decisionmaking that involves mitigating actions and the first comprehensive national assessment within the United Nations Convention to Combat Desertification framework.

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Section: Resultsmentioning

confidence: 99%

Identifying areas susceptible to desertification in the Brazilian northeast

et al. 2015

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“…On the other hand, some studies report that even larger changes in forest coverage (greater than 33%) may not cause changes to the streamflow regime. For example, no flow variation trends were observed (Trancoso et al, 2007) in large watersheds distributed in the Madeira, Tapajós and Xingu rivers watersheds, or even in those where more than half of the area is deforested (Trancoso et al, 2009). These data seem to indicate that changes in the FC alone may not be sufficient to affect the streamflow, although other factors also influence the hydrological behavior of watersheds.…”

Section: Relationship Of the Streamflow With Forest Coverage And Precmentioning

confidence: 96%

Forest Coverage and Streamflow of Watersheds in the Tropical Atlantic Rainforest

2018

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-The present study analyzed the average and minimum streamflow behavior of 11 watersheds located in the Atlantic Forest Biome, relating them to the changes in forest cover. The average minimum flow with seven days of duration (Q 7 ), the average annual flow (Q ave ), the total annual precipitation (P a ) and the percentage of forest cover (FC) for each watershed were determined. The joint correlation between the FC and the P a with the flow for each watershed were analyzed by adjusting multiple linear regression equations. The partial correlation coefficient was also used to analyze whether the variation in the FC influenced the water flow when the effects of P a are fixed. This study allowed us to identify significant associations between FC and P a with Q 7 or Q ave in only two of the watersheds. Disregarding the effects of P a , the increase in the FC tended to result in a reduction in the Q ave , and in turn increased the Q 7 in these two watersheds.Keywords: Water availability, Watershed management, Forest hydrology. COBERTURA FLORESTAL E VAZÕES DE BACIAS HIDROGRAFICAS DAMATA ATLÂNTICA RESUMO -O presente trabalho analisou o comportamento das vazões médias e mínimas de cursos d'água de 11 bacias hidrográficas localizadas no Bioma Mata Atlântica, relacionando-as às mudanças ocorridas na cobertura florestal. Determinaram-se, para cada bacia, a vazão mínima média com sete dias de duração (Q 7 ), a vazão média anual (Q ave ), a precipitação total anual (Pa) e o percentual de cobertura florestal (FC). Para cada bacia, a correlação conjunta da FC e Pa com as vazões foi analisada por meio do ajuste de equações de regressão linear múltipla. Também foi utilizado o coeficiente de correlação parcial para analisar se a variação do FC exerceu influência nas vazões, quando os efeitos da Pa são fixados. O estudo permitiu a identificação de associações significativas entre FC e Pa com Q 7 ou Q ave em apenas duas bacias. Descontados os efeitos da Pa, o incremento da FC tendeu a provocar redução da Q ave , tendo como contrapartida o aumento da Q 7 nestas duas bacias.

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“…However, although large areas have already been deforested in the Amazon River Basin, the balance between deforestation and conservation is still positive from the perspective of ecological processes and conservation [51]. On the scale of large watersheds, the area delimited by conservation areas is more than three times larger than the deforested areas [51]. These conservation measures might improve the status of wetland ecosystem health.…”

Section: Discussionmentioning

confidence: 99%

Assessment of Wetland Ecosystem Health in the Yangtze and Amazon River Basins

Sun

Yao

Wang

et al. 2017

IJGI

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Abstract:As "kidneys of the earth", wetlands play an important role in ameliorating weather conditions, flood storage, and the control and reduction of environmental pollution. With the development of local economies, the wetlands in both the Amazon and Yangtze River Basins have been affected and threatened by human activities, such as urban expansion, reclamation of land from lakes, land degradation, and large-scale agricultural development. It is necessary and important to develop a wetland ecosystem health evaluation model and to quantitatively evaluate the wetland ecosystem health in these two basins. In this paper, GlobeLand30 land cover maps and socio-economic and climate data from 2000 and 2010 were adopted to assess the wetland ecosystem health of the Yangtze and Amazon River Basins on the basis of a pressure-state-response (PSR) model. A total of 13 indicators were selected to build the wetland health assessment system. Weights of these indicators and PSR model components, as well as normalized wetland health scores, were assigned and calculated based on the analytic hierarchy process method. The results showed that from 2000 to 2010, the value of the mean wetland ecosystem health index in the Yangtze River Basin decreased from 0.482 to 0.481, while it increased from 0.582 to 0.593 in the Amazon River Basin. This indicated that the average status of wetland ecosystem health in the Amazon River Basin is better than that in the Yangtze River Basin, and that wetland health improved over time in the Amazon River Basin but worsened in the Yangtze River Basin.

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Deforestation and conservation in major watersheds of the Brazilian Amazon

Abstract: SUMMARYConserving natural vegetation cover is of critical importance for maintaining the ecological integrity and hydrological properties of large river basins (more than 100 000 km 2 ). Recent estimates indicate that more than 700 000 km

Cited by 53 publications

References 39 publications

Identifying areas susceptible to desertification in the Brazilian northeast

Identifying areas susceptible to desertification in the Brazilian northeast

Forest Coverage and Streamflow of Watersheds in the Tropical Atlantic Rainforest

Assessment of Wetland Ecosystem Health in the Yangtze and Amazon River Basins

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