Weed community and growth under the canopy of trees adapted to the brazilian semi-arid region

Silva, P. S. L.; Silva, P. I. B.; Silva, K. M. B.; Oliveira, Odaci Fernandes de; Jales, J. D. D.; Medeiros, J. L. B.

doi:10.1590/s0100-83582010000100009

Cited by 4 publications

(5 citation statements)

References 12 publications

(7 reference statements)

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“…A smaller number of species was found as compared with similar studies (Sit et al, 2007;Silva et al, 2010a) but the number of more frequently occurring conformed to these studies.…”

Section: Planting Densitiessupporting

confidence: 63%

“…Weed effects on the behavior of trees have been observed by some authors (Cantarelli et al, 2006). However, tree crops may also influence the understory (Silva et al, 2010a). There are three other aspects under which the tree-understory species relationship has been studied; these aspects provide information that is useful for weed control: silvopastoral systems, allelopathy, and natural ecosystems.…”

Section: Introductionmentioning

confidence: 99%

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Weeds under the canopies of tree species submitted to different planting densities and intercropping

Souza¹,

Silva

Oliveira

et al. 2013

Planta daninha

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Assessing the growth and floristic composition of species that grow under the canopy of trees is important for weed control (WC). The objective of this study was to assess two experiments (E1 and E2), when the trees were two years and one year of age, respectively. In E1, sabiá (S) and gliricidia (G) were submitted to planting densities from 400 to 1.200 plants ha-1. In E2, growing systems consisting of S, G, and neem (N) combinations were compared: SSS, GGG, NNN, GSG, NSN, SGS, NGN, SNS, and GNG (each letter represents a row of plants). A random block design was adopted, with three (E1) and four (E2) replicates. In E1, treatments were arranged as split-plots (species in plots). In E2, the degrees of freedom for treatments (8) were partitioned into growing systems (treatments that involved the same species) and between growing system groups (2). Twenty-one weed species were found in E1. Gliricidia attained greater plant height than sabiá, but these species did not differ in canopy diameter, number of weed species per plot, and weed green and dry biomass of the shoot. Higher planting densities resulted in the reduction of all those traits. Twenty-six weed species were found in E2. Growing systems that included gliricidia showed canopies with greater diameters than growing systems that included neem. There were no differences between growing systems for number of weed species per plot and for weed green and dry biomass of the shoot.

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“…A smaller number of species was found as compared with similar studies (Sit et al, 2007;Silva et al, 2010a) but the number of more frequently occurring conformed to these studies.…”

Section: Planting Densitiessupporting

confidence: 63%

Section: Introductionmentioning

confidence: 99%

Weeds under the canopies of tree species submitted to different planting densities and intercropping

Souza¹,

Silva

Oliveira

et al. 2013

Planta daninha

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“…Phytosociology and floristic surveys were more predominant with regard to species conservation, with C. leprosum being cited in eight studies (Lacerda & Barbosa, 2020;Lima & Coelho, 2018;Pereira, et al, 2018;Sabino et al, 2016;Lima & Coelho, 2015;Umetsu et al, 2011;Silva et al, 2010;Farias & Castro, 2004). Studies that address knowledge about the floristic composition and phytosociological structure of a species or locality allow the conservation, management and recovery of natural environments (Borém & Ramos, 2001;Velazco et al, 2015).…”

Section: Conservation Regeneration and Managementmentioning

confidence: 99%

“…Studies associated with environmental regeneration cite C. leprosum as a facilitator in the establishment of species in the semiarid region (Vieira et al, 2013;Lucas et al, 2022a;Lucas et al, 2022b) and weed growth (Silva et al, 2010). In these studies, it was observed that species that grow under the canopy of C. leprosum present better values in water status, lower incidence of solar radiation, lower thermal stress and higher soil relative humidity (Vieira et al, 2013;Lucas et al, 2022a;Lucas et al, 2022b).…”

Section: Conservation Regeneration and Managementmentioning

confidence: 99%

Combretum leprosum Mart.: Botany, Ethnomedicinal Uses, Biological Activities, Phytochemistry and Conservation Needs

Alcântara

Almeida-Bezerra²,

Santos³

et al. 2022

RSD

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Combretum leprosum is a plant species with wide distribution in Brazil known as “mofumbo”, standing out in studies associated with its pharmacological and ethnobotanical activity. The medicinal applications of the species are widely reported in the literature, using the bark, leaves and flowers as healing agents. Given the economic, pharmacological and ecological importance, this work aimed to present a systematic review of production, conservation status and knowledge about the species in different fields of knowledge. The literature review was based on seven categories, characterized according to the study area: biological and/or pharmacological activity (32 articles), importance of conservation status (29), botanical aspects (18), phytochemistry (9), geographic distribution (8), foraging (5) and ethnobotanical uses (2). Most of the works address biological and/or pharmacological activity of the species, and its application is focused on antitumor action, treatment against Chagas disease, antinociceptive behavior, antibacterial, antioxidant, anti-inflammatory and antiproliferative action. Among the compounds isolated from C. leprosum with different applications, 3β-6β-16β-trihydroxylup-20(29)-ene stands out, a lupane triterpene isolated from different parts of the plant, associated with different medicinal and therapeutic applications. The species was highlighted in works associated with environmental regeneration, being resistant to different phytophysiognomies and showing tolerance to environments contaminated by heavy metals, being able to represent an important species in reforestation programs and recovery of degraded environments. However, even with the growing number of studies associated with C. leprosum in recent years, the species does not have an assessment regarding its degree of threat, demonstrating the need for research associated with the species and the possible impacts that its representatives may suffer, helping in sustainable development and conservation programs.

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“…However, such associations may become hampered in the event that the associated tree exhibits some level of allelopathy, or the capacity to alter the availability of soil nutrients, light and other limiting resources. On the other hand, the growth performance of any tree may be affected by a number of factors including cultural practices, planting density, as well as the tree's interaction with understory plants that also significant from an ecological viewpoint (Cantarelli et al 2006, Leopold and Salazar 2008, Silva et al 2010.…”

Section: Introductionmentioning

confidence: 99%

Single-tree influence of Tectona grandis Linn. f. on plant distribution and soil characteristics in a planted forest

2020

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Background: Little is known about the single-tree influence of Tectona grandis Linn. f. on plant distribution and soil characteristics in Benin City, Nigeria. We investigated the possible single-tree effect of T. grandis on understory plants in an 8-year-old teak plantation at the Moist Forest Research Station. An area of 36.57 m by 60.96 m was marked out and divided into 15 equal-sized subplots containing 10 trees per subplot. Marked distances from the base of a randomly selected tree per subplot were made (0-0.5 m, 0.5-1.0 m and 1.0-1.5 m). Results: Single-tree influence of T. grandis was observed in the soil total organic carbon, total nitrogen and soluble phosphorus, where concentrations were higher with 1.5-m radius from the tree than beyond. Moreover, the pH of the topsoil within 1.5 m from the base of the tree was lower (pH 4.4) than beyond 1.5 m from the base of the tree (pH 5.4). Species-specific single-tree effect was also observed on the understory plant distribution likely due to diverse ecophysiological interactions. Within 1.5 m from the tree, plant species abundance, especially of Sida garckeana, Reisantia indica, Momordica charantia and Tridax procumbens were negatively affected. However, the distribution of Eleusine indica around the tree was not negatively influenced. Plant abundance was generally suppressed in Cynodon dactylon, Axonopus compressus, Andropogon gayanus, Commelina diffusa and Euphorbia hirta. Generally, there were more plant species beyond the canopy fringes than within the canopy, indicating inhibitory single-tree effects. Conclusion: Not all plant species in close proximity to T. grandis are affected. This is important considering that plant-plant associations affect the quality of forest soils. Generally, more plant species were recorded outside the 1.5-m demarcation than within, an increase in soil organic matter may further enhance such plant species abundance. The impact of T. grandis in forest soil quality is possibly a factor of the outcome of its association with neighbouring plant species. Diverse mechanisms at play may be responsible for the observed effects on soil chemistry. However, a reduction in the soil organic matter and variations in other environmental factors also contributed to observed single-tree effect.

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Weed community and growth under the canopy of trees adapted to the brazilian semi-arid region

Cited by 4 publications

References 12 publications

Weeds under the canopies of tree species submitted to different planting densities and intercropping

Weeds under the canopies of tree species submitted to different planting densities and intercropping

Combretum leprosum Mart.: Botany, Ethnomedicinal Uses, Biological Activities, Phytochemistry and Conservation Needs

Single-tree influence of Tectona grandis Linn. f. on plant distribution and soil characteristics in a planted forest

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