Changes in attributes of soils subjected to fallow in desertification hotspot

Ferreira, Mirele Paula da Silva; Artur, Adriana Guirado; Queiroz, Hermano Melo; Romero, Ricardo Espíndola; Costa, Mírian Cristina Gomes

doi:10.5935/1806-6690.20180003

Cited by 5 publications

(3 citation statements)

References 9 publications

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“…Both communities are located in the district of Irauçuba which, according to Araujo Filho et al (2002) and Ferreira et al (2018), presents livestock farming with a greater number of animals than the carrying capacity, and where land-use pressure increased between 2000 and 2006 by 69% (INSTITUTO BRASILEIRO DE GEOGRAFIA E STAT Í STICA, 2006). This explains the critical situation of overgrazing in the region, which, together with other factors of recurrent degradation in these areas, justifies the results found in this study for the communities of Bom Jesus and Fumo.…”

Section: Resultsmentioning

confidence: 99%

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Detecting desertification in different years and rainfall regimes by 2D Scatter Plot

Santos

Teixeira

Terra

et al. 2021

Revista Ciência Agronômica

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The desertification process causes soil degradation and a reduction in vegetation. The absence of visualisation techniques and the broad spatial and temporal dimension of the data hampers the identification of desertification and rapid decision-making by multidisciplinary teams. The 2D Scatter Plot is a two-dimensional visual analysis of reflectances in the red (630 -690 nm) and nearinfrared (760 -900 nm) bands to visualise the spectral response of the vegetation. The hypothesis of this study is that visualising the reflectances of the vegetation by means of a 2D scatter plot will allow desertification to be inferred. The aim of this study was to identify desertified areas and characterise the spatial and temporal dynamics of the vegetation and soil during dry (DP) and rainy (RP) periods between 2000 and 2008, using a 2D scatter plot. The 2D scatter plot generated by the Envi ® 4.8 software and the reflectances in bands 3 and 4 of the TM5 sensor were used within communities in the Irauçuba hub (Ceará, Brazil). The concentration densities of the near-infrared reflectances of the vegetation pixels were observed. Each community presented pixel concentrations with reflectances of less than 0.4 (40%) during each of the periods under evaluation, indicating little vegetation development, with further degradation caused by deforestation, the use of fire and overgrazing. The 2D scatter plot was able to show vegetation with low reflectance in the near infrared during both dry and rainy periods between 2000 and 2008, thereby inferring the occurrence of desertification.

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Section: Resultsmentioning

confidence: 99%

“…The Irauçuba Centro Norte desertification hub (CE) is one of the most studied in north-eastern Brazil. The causes of degradation are overgrazing and deforestation, recurrent practices in the area, which have led to soil compaction and erosion, and a loss of productive potential (ARAUJO FILHO et al, 2002;FERREIRA et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

Detecting desertification in different years and rainfall regimes by 2D Scatter Plot

Santos

Teixeira

Terra

et al. 2021

Revista Ciência Agronômica

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“…Conforme é abordado por Araújo e Souza (2017), na agricultura, as consequências da desertificação são bastante graves por si próprias, porém os impactos mais severos são vistos na redução da capacidade de produção das terras. Diante disso, vários indicadores de produção agropecuária podem sofrer efeitos deletérios, como o rendimento e valor da produção agropecuária; evidenciados, por exemplo, por meio da diminuição da produção de leite, queda da produção de carne, bem como a redução na produtividade de várias culturas agrícolas (Jamala et al, 2013;Geidam e Sabo, 2014;Ferreira et al, 2018).…”

Section: Impactos Ambientais Da Desertificação E Os Seus Efeitos Nas ...unclassified

Técnicas hidricamente eficientes e modelagem: estratégias para a sustentabilidade e intensificação da agricultura frente às mudanças do clima em ambientes suscetíveis à desertificação

Costa¹,

Souza²,

Jardim³

et al. 2022

Rev. Bras. Geog. Fis.

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Em regiões suscetíveis a desertificação, como é o caso do Semiárido, o uso de tecnologias hídricas pode servir como ferramenta para mitigar os impactos ambientais, aumentar a eficiência no uso da água e garantir uma menor estacionalidade da produção. Nesta revisão, buscamos abordar as principais estratégias que podem contribuir para a sustentabilidade, intensificação e planejamento da atividade agrícola nas regiões com riscos de desertificação. Para isso, discutiu-se os problemas e as principais características ambientais das áreas suscetíveis a esse processo; abordou-se o uso de tecnologias hídricas (e.g. adoção de espécies vegetais resistentes ao estresse hídrico, uso de clones/cultivares mais adaptados à condições estressantes, intensidade de corte, cultivo, uso de cobertura morta), práticas que visam aumentar a eficiência do uso da água na agricultura; destacou-se o modelo AquaCrop da FAO como ferramenta para inferir sobre o impacto de possíveis cenários ambientais na agricultura, bem como simular as melhores estratégias de resiliência; e, por fim, frisou-se outros conceitos relacionados a sustentabilidade da agricultura como: eficiência no uso da água, agricultura verde, e caracterizadores de um sistema agrícola. Nossos achados reforçam a necessidade de uma visão holística dos agroecossistemas para integrar as tecnologias hídricas a outras estratégias de aumento da eficiência no uso dos recursos e de redução a liberação de gases de efeito estufa (GEE), de modo a contribuir com a sustentabilidade da atividade e a mitigação dos impactos no meio ambiente. Outrossim, com a utilização da modelagem é possível prever os impactos que as condições climáticas futura proporcionarão ao planeta, de modo a planejar estratégias mais eficazes para a convivência da agricultura com as mudanças do clima.Palavras-chave: AquaCrop; eficiência no uso da água; estratégias de resiliência agrícola. Water technologies and modeling: strategies in the search for sustainability and intensification of agriculture in susceptible environments to desertification A B S T R A C TIn regions susceptible to desertification, such as the semi-arid region, the use of water technologies can serve as tool to mitigate environmental impacts, increase water efficiency, and ensure a lower state of production. In this review, we seek to address the main strategies that can contribute to the sustainability, intensification and planning of agricultural activity in regions with desertification risks. To this end, the problems and main environmental characteristics of the areas susceptible to this process were discussed; the use of water technologies (e.g. adoption of plant species resistant to water stress, use of clones/cultivars more adapted to stressful conditions, cutting intensity, cultivation, use of mulch), practices aimed at increasing the efficiency of water use in agriculture; the FAO AquaCrop model was highlighted as a tool to infer about the impact of possible environmental scenarios on agriculture, as well as to simulate the best resilience strategies; and, finally, other concepts related to the sustainability of agriculture were emphasized, such as: efficiency in the use of water, green agriculture, and characterizations of an agricultural system. Our findings reinforce the need for a holistic view of agroecosystems to integrate water technologies with other strategies to increase resource efficiency and reduce the release of greenhouse gases (GHG), to contribute to the sustainability of the activity and the mitigation of impacts on the environment. Moreover, with the use of modeling it is possible to predict the impacts that future weather conditions will bring to the planet, to plan more effective strategies for the coexistence of agriculture with climate change.Keywords: AquaCrop; efficiency in water use; agricultural resilience strategies

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Monitoring desertification in semiarid Brazil: Using the Desertification Degree Index (DDI)

et al. 2020

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Desertification is a phenomenon that takes place in the arid, semiarid and dry subhumid areas of the Planet. Although its causes and consequences are well known, data and robust information are often insufficient to provide indicators that allow desertification effects to be measured precisely and efficiently. Accordingly, the objective of this study was to introduce a methodology for the drafting of a monitoring index for desertification, with indicators of vegetal coverage, taking the semiarid area of Paraiba State, Brazil, as the test example. For this purpose, we analyzed conserved and desertified areas (22 pairs), in which we evaluated the following parameters: woody species richness, woody plant density, canopy height, mean basal circumference, mean circumference at breast height and total absolute dominance. First, we selected the indicators, calculated the areas of coverage and measured the reference values. Subsequently, we obtained masses for the indicators, and developed and tested the desertification degree index (DDI). The DDI showed 99% accuracy and 95% efficiency, respectively, and was able to select indicators and evaluate the level of desertification in the test areas. The methodology is simple, inexpensive and replicable in other regions of the world as a means of monitoring and planning strategies to counter desertification.

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Changes in attributes of soils subjected to fallow in desertification hotspot

Cited by 5 publications

References 9 publications

Detecting desertification in different years and rainfall regimes by 2D Scatter Plot

Detecting desertification in different years and rainfall regimes by 2D Scatter Plot

Técnicas hidricamente eficientes e modelagem: estratégias para a sustentabilidade e intensificação da agricultura frente às mudanças do clima em ambientes suscetíveis à desertificação

Monitoring desertification in semiarid Brazil: Using the Desertification Degree Index (DDI)

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