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  1. Artikel: Distinct leaf water potential regulation of tree species and vegetation types across the Cerrado–Amazonia transition

    Soares Jancoski, Halina / Schwantes Marimon, Beatriz / C. Scalon, Marina / de V. Barros, Fernanda / Marimon‐Junior, Ben Hur / Carvalho, Eder / S. Oliveira, Rafael / Oliveras Menor, Imma

    Biotropica. 2022 Mar., v. 54, no. 2

    2022  

    Abstract: The Cerrado–Amazonia transition harbors forest and savanna formations under the influence of pronounced climate seasonality; however, the water use strategies of this key region is not yet well understood. This study aimed at deciphering in intra‐ and ... ...

    Abstract The Cerrado–Amazonia transition harbors forest and savanna formations under the influence of pronounced climate seasonality; however, the water use strategies of this key region is not yet well understood. This study aimed at deciphering in intra‐ and interspecific variability in leaf water potential regulation among species across three distinct vegetation types (typical cerrado, cerradão, and semideciduous seasonal forest) of the Cerrado–Amazonia transition region. We expected a variation across iso/anisohydric strategies driven by plant–environment interactions and by species attributes (phenology and wood density). We selected 21 dominant species (seven per vegetation type), recorded their phenological strategy and wood density, and measured leaf water potential (Ψₗ) during the dry and rainy seasons to analyze variations associated with minimum Ψₗ, predawn Ψₗ (ΔΨₚd), and midday Ψₗ (ΔΨₘd) under the effect of variable vapor pressure deficit (VPD). The variation in Ψₗ across species was higher in the dry season than in the rainy season for all vegetation types. Most species from typical cerrado and cerradão showed similar behavior patterns, with higher Ψₗ regulation under high VPD and lower ΔΨₚd. In contrast, most forest species showed lower regulation under high VPD, and higher ΔΨₚd. Total or partial deciduousness together with strong stomatal regulation seems to be common water regulation strategies in the dry season for cerrado species but not for forest species. Our results suggest that, if drought events become more intense and frequent as predicted, seasonal forest species may be more vulnerable due to their lower Ψₗ regulation. Abstract in Portuguese is available with online material.
    Schlagwörter cerrado ; climate ; deciduous forests ; dominant species ; drought ; dry season ; interspecific variation ; leaf water potential ; phenology ; savannas ; stomatal movement ; trees ; vapor pressure deficit ; wet season ; wood density
    Sprache Englisch
    Erscheinungsverlauf 2022-03
    Umfang p. 431-443.
    Erscheinungsort John Wiley & Sons, Ltd
    Dokumenttyp Artikel
    Anmerkung JOURNAL ARTICLE
    ZDB-ID 2052061-X
    ISSN 1744-7429 ; 0006-3606
    ISSN (online) 1744-7429
    ISSN 0006-3606
    DOI 10.1111/btp.13064
    Datenquelle NAL Katalog (AGRICOLA)

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  2. Artikel: The adoption of Voluntary Sustainability Standards (VSS) and value chain upgrading in the Brazilian coffee production context

    Piao, Roberta Souza / Carvalho, Eder / Florencio de Almeida, Luciana / Fonseca, Lyon / Januário, Eder de Carvalho / Macchione Saes, Maria Sylvia

    Journal of rural studies. 2019 Oct., v. 71

    2019  

    Abstract: With the spread of sustainable thinking, people have come to recognize that profitability is not the only element for the long-term success of businesses. Of equal importance is the issue of the use of natural resources and people's living conditions. ... ...

    Abstract With the spread of sustainable thinking, people have come to recognize that profitability is not the only element for the long-term success of businesses. Of equal importance is the issue of the use of natural resources and people's living conditions. Within this realization, consumers' interest in knowing the implications of their consumption is increasing through information on how products and services are produced. This increasingly leads organizations to seek to differentiate their brands through Voluntary Sustainability Standards (VSS). In this context, the aim of this paper is to present a taxonomy of value chain upgrading types through VSS adoption by farmers. Empirical evidence to test the proposed framework is presented focusing on the adoption of the 4C system by coffee farmers in Brazil. Although all five types of upgrading were identified in the field research, most of the improvements can be characterized as environmental. Furthermore, the results indicated that the adoption of the 4C standards was an upgrading form for farmers to enhance the coffee production process, as well as to control management activities within the production unit. The paper is innovative in integrating and proposing a framework for the value chain by adding value through VSS. It also empirically applies the proposed framework in the context of the Brazilian coffee chain.
    Schlagwörter business enterprises ; crop production ; farmers ; natural resources ; profitability ; supply chain ; sustainable agriculture ; Brazil
    Sprache Englisch
    Erscheinungsverlauf 2019-10
    Umfang p. 13-22.
    Erscheinungsort Elsevier Ltd
    Dokumenttyp Artikel
    ZDB-ID 252458-2
    ISSN 0743-0167
    ISSN 0743-0167
    DOI 10.1016/j.jrurstud.2019.09.007
    Datenquelle NAL Katalog (AGRICOLA)

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