Eutrofização de solos e comunidade arbórea em fragmentos de uma paisagem agrícola

Uzêda, Mariella Camardelli; Fidalgo, E. C. C.; Moreira, Renato Valadares de Sousa; Fontana, Ademir; Donagemma, G. K.

doi:10.1590/s0100-204x2016000900011

Cited by 7 publications

(19 citation statements)

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“…Among the potential impacts from surrounding agricultural areas on the interior of the fragments, changes in soil fertility with increased nutrient levels have been widely discussed in the literature [15,17,18,47]. A recent study in the same study site [18] showed a trend of soil eutrophication in forest fragments located in the same study area, with significant increases in calcium, phosphorus and potassium, while another similar study [17] observed that the higher the fertilizer application intensity in agricultural areas, the higher the nutrient content in nearby forest fragments. The frequent practices of liming and fertilizer use in conventional agriculture fields combined with soil rotation result in drift and transport of fine soil particles by air, which are deposited in soil fragments [15,17, 18].…”

Section: Discussionmentioning

confidence: 99%

“…Location of the studied fragments and land use classes in the Guapi-Macacu River Basin, Rio de Janeiro, Brazil (FIDALGO et al, 2008). …”

Section: Methodsmentioning

confidence: 99%

“…The taxonomic determinations were carried out by consulting the Herbariums of the Research Institute of the Botanical Garden of Rio de Janeiro and the Department of Botany (RBR) of UFRRJ (Federal Rural University of Rio de Janeiro), by specialized bibliography, or by specialists. Part of the floristic survey had already been carried out in a previous study [18] using the same methodology used in this study. These data were also collected for conducting this work.…”

Section: Methodsmentioning

confidence: 99%

“…Then, the proportion of their boundaries to be found in line with the different types of land use was calculated. Because the studied fragments are only surrounded by pasture and agriculture, and therefore the percentages of these two limit types total 100, it was decided to only use the limit percentage with agriculture, thus avoiding highly correlated answers [18].…”

Section: Methodsmentioning

confidence: 99%

“…The main strategies for agriculture intensification are based on technological packages that include conventional practices and the frequent use of agricultural inputs for fertilization and correcting soil pH [5,6]. Some studies show that the intensification of these practices in agricultural fields generates impacts on nearby forest fragments through soil contamination by fertilizers, causing increased nutrient content in these areas [15-18]. These changes in fertility levels of soil fragments can have significant impacts on the floristic composition due to the great correlation between vegetation and soil chemical characteristics [19-21].…”

Section: Introductionmentioning

confidence: 99%

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Forest fragmentation and impacts of intensive agriculture: responses from functional groups of the tree community

2019

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Agricultural landscapes are seen as areas of extreme importance for studying and developing strategies that integrate biodiversity conservation and ecosystem services with food production. The main strategies for intensifying agriculture are based on conventional practices of frequently using agricultural inputs for fertilization and correction of soil pH. Some studies show that these practices generate impacts on nearby forest fragments through soil contamination, causing an increase in nutrient content. The objective of this study was to identify the impacts on the functional groups of sciophilous and heliophilous species of a tree community of 14 forest fragments near agricultural areas under conventional practices, and raised the hypothesis that the higher the fertility of forest fragments adjacent to intensive agriculture modifies the floristic composition of the tree community. The floristic composition of fragments close to agricultural areas are more similar to each other and the General Linear Model (GLM) results show a clear influence of the intensive farming environment on the richness and abundance of the two functional groups in the forest fragments, directly benefiting the abundance of heliophilous species which are also benefited by the greater declivity and smaller fragment area, while the abundance of sciophytes is negatively correlated with these last two variables. The increase of calcium content is beneficial for the richness of heliophilous species, while the increase in phosphorus content influences a reduction in the richness of sciophyte species, which also respond strongly to the isolation between fragments. The results indicate a dominance trend of pioneer species in nutritionally enriched soils, evidencing that the intense adoption of inputs in cultivated areas causes concrete impacts on the diversity of the tree community of forest fragments, being more determinant for the species richness than the size of the fragments.

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