Probabilistic Classification of Tree and Shrub Vegetation on Phytogeographic System

Costa, T. C. e C. da; Silva, Andréia Fonseca; Oliveira, Luciana Mara Temponi de; Viana, J. H. M.

doi:10.17265/2162-5263/2015.06.003

Cited by 3 publications

(2 citation statements)

References 7 publications

(7 reference statements)

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“…NDVI saturation in dense plant coverage affects the relation between LAI and NDVI, which occurs especially in ombrophilous typologies. The site 81 is classified as rain forest by IBGE, and is predominantly classified as Seasonal forest always green by Costa, T. C. C., et al [24]. Another possible cause of NDVI saturation is amplitude changes of red and near infrared bands in Landsat 8.…”

Section: Resultsmentioning

confidence: 99%

Improved Model for Semideciduous Seasonal Forest Production of Leaves and Deciduousness

Costa¹

2017

JESE-A

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The climate, mainly the water availability and temperature, drives the renewal of biomass in seasonal forest ecosystem, and the greenness and leaf area of its canopy are responsive by climate variations. This study verified models to explain the phenomenon of leaf production and deciduousness by time, with LAI (Leaf Area Index), NDVI (Normalized Difference Vegetation Index) and climate variables, on period 2011-2016. The data were obtained in satellite images and in plots installed at forest monitoring sites, visited monthly. The analysis incorporated the water balance. Three equations were compared, two already published and the equation that was adjusted in this work. The model was improved and validated with new variables and data. It is possible to estimate the fall and renew of leaves biomass in semideciduous forests with reasonable precision.

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Section: Resultsmentioning

confidence: 99%

Improved Model for Semideciduous Seasonal Forest Production of Leaves and Deciduousness

Costa¹

2017

JESE-A

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“…Areas of conventional maize and of maize genetically modified with B. thuringiensis (Bt) were used, as they show a history of intensive maize and sorghum cultivation; and an area of native vegetation (NV), characterized as Seasonal Forest Always Green (Costa et al, 2015). Ant samplings were carried out in four producing cycles (periods) of mayze crops grown at different times: the first one was performed in 2011 (May to October -1 st maize period); and the second one, in 2011/2012 (December 2011 to April 2012 -2 nd maize period).…”

Section: Methodsmentioning

confidence: 99%

Transgenic Bt maize does not affect the soil ant community

Assis

Chagas

Marinho

et al. 2018

Pesq. agropec. bras.

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-The objective of this work was to survey soil ants in Bt and non-Bt maize (Zea mays) crops, and to compare their effect on the soil ant community. Nine pitfall traps, 10 m apart, were installed in a central area (900 m 2 ) of each of the following treatments (2,500 m 2 ): conventional maize; maize modified with the Cry1F, Cry1Ab, and Vip3A proteins; and a native vegetation area. Fortnightly collections were conducted during four periods (complete producing cycles) of the crop, from 2011 to 2013. The number of ant species varied from 25 in Bt maize (Vip 3A) to 58 in Bt maize (Cry 1F). The treatment with conventional maize showed the highest Shannon-Wiener diversity index (H' = 2.60). Jaccard's index showed that there is dissimilarity between the cultivated maize areas and the native vegetation area in most treatments, and that Bt and non-Bt maize show similarity in their soil ant assemblages. The cultivation of Bt maize does not affect the soil ant community. The subfamily Myrmicinae shows the highest number of species in all the collection periods, with 57, 41, 47, and 50 species in the first, second, third, and fourth periods, respectively. The genus Pheidole, belonging to this subfamily, shows the greatest number of species.

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Soil carbon stock and biological activity in silvopastoral systems planted with

et al. 2022

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Context There is little information on the effects of tree densities and ages of silvopastoral systems (SSPs) on total soil carbon stock (TSCS). Aims This study aimed to evaluate the TSCS, carbon and nitrogen fractionation and biological activity in SSPs planted with Eucalyptus grandis in different densities and ages. Methods Two SSPs (333 or 166 trees ha−1) and one full sun pasture (FSP) grown for 5 or 7 years and native vegetation (NV) were evaluated (seven treatments). Samples were collected up to 1 m deep to evaluate the variables. Key results Particulate organic carbon (POC) and particulate organic nitrogen (PON) were higher (P < 0.05) in FSP (14.1 and 0.725 g kg−1), intermediate in SSP (9.88 and 0.46 g kg−1) and lower in NV (6.12 and 0.29 g kg−1). TSCS was 44.8% (194 vs 134 Mg ha−1; P < 0.001) higher in SSP and FSP compared to NV. Higher tree density reduced TSCS in younger systems, but without effect on older systems. TSCS was 13.7% (207 vs 182 Mg ha−1; P = 0.026), POC was 52.0% (11.9 vs 7.83 g kg−1; P < 0.001) and PON was 54.4% (0.556 vs 0.360 g kg−1; P < 0.001) higher in SSP for 7 compared to 5 years, respectively. Conclusions Tree density had a limited effect on TSCS. Higher SSP age increased carbon sequestration, probably due to greater cycling in the particulate fraction and better biological activity. Implications The SSP and well-managed FSP are good strategies to increase TSCS compared to NV, and their use can improve environmental indicators.

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Probabilistic Classification of Tree and Shrub Vegetation on Phytogeographic System

Cited by 3 publications

References 7 publications

Improved Model for Semideciduous Seasonal Forest Production of Leaves and Deciduousness

Improved Model for Semideciduous Seasonal Forest Production of Leaves and Deciduousness

Transgenic Bt maize does not affect the soil ant community

Soil carbon stock and biological activity in silvopastoral systems planted with

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