Nutrients and heavy metals accumulation by the giant milkweed Calotropis procera (Aiton) W.T. Aiton in urbanized areas, Egypt

Galal, Tarek M.; Farahat, Emad A.; El-Midany, Maha M.; Hassan, Loutfy M.

doi:10.1007/s12210-015-0468-4

Cited by 16 publications

(17 citation statements)

References 24 publications

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“…These portions of Pb, Cu, Cd and Zn under favourable conditions are available for wider food chain impact through plant uptake. Elevated concentrations of Cd, Zn, Pb and Cu recorded in some plant species collected from the study area by El-Mekawy 2007 , Galal et al 2016 and Alkhdhairi et al 2018 confirm the bio-accessibility and total bioavailability indicated by this result. The content of the exchangeable fraction (F1) is readily available for plant uptake.…”

Section: Resultssupporting

confidence: 67%

“…Soil contamination with PTE has previously been identified as an issue in parts of the Helwan area ((Shakour 1991 ); (Ammar 2005 ); (Melegy 2005 ); (El-Mekawy 2007 ); (Melegy et al 2010 ) and (Alkhdhairi et al 2018 )). These have already been associated with crop production in this area ((El-Mekawy 2007 ); (Galal et al 2016 ) and (Alkhdhairi et al 2018 )) as a result of the presence of high PTE concentrations (particularly for Zn, Pb, Cu and Cd) in vegetation in the study area. The identification of wide spread soil contamination in the El-Tabbin district of southern Helwan (Melegy et al 2010 ) highlighted Cd, Se, As, Zn, Ba and Pb as an issue.…”

Section: Introductionmentioning

confidence: 55%

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Environmental factors controlling potentially toxic element behaviour in urban soils, El Tebbin, Egypt

Said

Salman

Samy

et al. 2019

Environ Monit Assess

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This study focuses on the assessment of surface soils from industrially polluted region (El Tebbin) of southern Cairo, Egypt. The impact of agricultural, residential and industrial land use on soils developed from Nile river sediments has significantly compromised their function. Previous evidence has shown that the food chain is contaminated and enhances risk of contaminant exposure of the residential communities. This study investigates factors controlling potentially toxic element (PTE) distribution (Co, Ni, Pb, Cd, Zn, Cr and Cu) in El Tebbin soils and provide estimates of their mobility and bioavailability. The PTE concentrations are characterised by high variability as result of the variety of natural and anthropogenic influences. Highest spatial variability is found for Zn, Cd, Pb and Cu (C.V = 260.0%, 280.4%, 140.8% and 159.6% respectively) and enrichment factors indicate strong anthropogenic inputs. For Co and Ni, relatively low spatial variability (C.V = 65.8% and 45.0% respectively) with depletion in Ni suggests a relatively minor contribution from anthropogenic sources. For Cr, a more uniform distribution pattern showing depletion to minimal enrichment across the study area (C.V = 19.2%) reflects almost exclusive lithogenic control. Using principle component analysis (PCA) to explore concentration data reveals that the major inputs affecting PTE distribution are modified by primary soil properties (texture and pH). Their relative bioavailability (identified through sequential chemical extraction) relates strongly to local input sources. Those elements dominated by lithogenic input (Ni and Co) were found predominantly in soil residual fractions (95.6% and 90.5% respectively), while elements with stronger anthropogenic contributions (Cd, Zn, Pb and Cu) showed much higher portion in the more mobile and bioavailable fractions obtained from sequential chemical extraction, with average proportions of the totals being 62.6%, 57%, 40.7% and 39.2% respectively. Those PTEs with strong anthropogenic influence are potentially much more mobile for bioaccumulation in food chain with increased health risk for exposed residents and are confirmed by elevated concentrations of Cd, Zn, Pb and Cu recorded in local plant species. The main pollution sources were further highlighted by cluster analysis and showed vehicle traffic and specific industrial activities but which varied significantly from site to site. The identification of sources through the approach developed here allows prioritisation of monitoring and regulatory decisions by the local government to reduce further environmental exposure of the local population.

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Section: Resultssupporting

confidence: 67%

Section: Introductionmentioning

confidence: 55%

Environmental factors controlling potentially toxic element behaviour in urban soils, El Tebbin, Egypt

Said

Salman

Samy

et al. 2019

Environ Monit Assess

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“…The plant is known generally to tolerate habitats with annual precipitation of 150-1,000 mm per year and temperature range of 20 -30°C (CABI 2005), however in Egypt it survived on precipitation rate of only 4.7 mm per year and temperature as low as 13.4°C [36]. As a result, Calotropis procera was found to produce deep roots and root suckers, and rarely grows in shallow soils over unfractured rock [34].…”

Section: Ecologymentioning

confidence: 99%

“…It has been declared as an invasive species in Australia where control strategies suggested to remove the tree mechanically with its deep tap root and lateral roots to prevent suckering, furthermore, extensive competition with tall weeds or brushes especially grass might be an efficient way to weaken Calotropis and prevent seed germination, meanwhile, chemical control is advisable for larger Calotropis colonies [13]. [26,36]. Meanwhile, Brazilian experimental studies have proved its ability to tolerate specific edaphic conditions and hence suggested that it has the potential to invade such habitats [46,47].…”

Section: Ecologymentioning

confidence: 99%

Population Ecology and Economic Importance of Calotropis procera as an Exotic Medicinal Plant

Ara¹

2017

JENR

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A review is given regarding the medicinal plant Calotropis procera (Aiton) W.T a member of the family (Asclepiadaceae) commonly known as Giant Milk weed. It demonstrated that Calotropis is a perennial xerophytic woody shrub that has a great capacity to inhabit abandoned lands, it tolerated poor soils with limited nutrition and moisture, known to establish an intensive root system as a drought resistance mechanism. It exhibited allelopathic properties and phytoremediation, considered invasive in many habitats. C. procera is widespread in tropical and subtropical regions of the globe, in Egypt it's distributed through several phytogeographic regions with different edaphic properties, consequently, it showed great polymorphism and wide variety in metabolites in accordance to different environments. The seeds possess a unique silk formation that aided in dispersal through wind, water or any moving substance. Environmental conditions specially precipitation rates, was found to control the invasive behavior of the species since it showed no invasive attribute in arid environments where it's originally found such as Egypt or Saudi Arabia, on the contrary, Australia for instance knew C. procera as an invasive naturalized plant. A great benefit could be taken from Calotropis procera on many levels, as on one hand it is known traditionally, in folk medicine to have purgative and anthelimintic properties and used in treating leprosy, ulcers, tumors and piles as well as purgative, anticoagulant, and anticancer, moreover, the plant's latex has been known for cardiac glycoside content and contains compounds with pesticide properties, while on the other hand, its biomass proved a tendency to be a good source of renewable energy and hydrocarbon. Finally, Calotropis procera populations have an immense ecologic role being habitat for several organisms, displaying phytoremedy properties in contaminated soils and its ability to rehabilitate deserted land bringing back life once again.

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“…These habitats were characterized by high levels of heavy metals. This could be an explanation for the high presence of Calotropis procera in these habitats because its high ability to accumulate heavy metals (Galal et al, 2016).…”

Section: Discussionmentioning

confidence: 99%

Vegetation Analysis of Some Wetland Habitats in Central Region of Saudi Arabia

Al-Amro¹,

El-Sheikh²,

El‐Sheikh³

2018

Appl. Ecol. Env. Res.

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Abstract. In this study, the vegetation of 63 sabkha and sewage canals in central region of Saudi Arabia was analyzed. A total of 109 plant species belonging to 83 different genera and 34 different plant families were collected. The most common plant families were Chenopodiaceae (18 species), Poaceae (16 species) and Asteraceae (10 species). Vegetation in the study area was classified into 6 groups; two of them were found in sabkhas only, one was found in sewage canals only and the other three were found in both habitats. The main factors controlling the plant presence and vigour in the studied wetlands were soil salinity, pH, EC, soil texture and content of organic matter.

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Nutrients and heavy metals accumulation by the giant milkweed Calotropis procera (Aiton) W.T. Aiton in urbanized areas, Egypt

Cited by 16 publications

References 24 publications

Environmental factors controlling potentially toxic element behaviour in urban soils, El Tebbin, Egypt

Environmental factors controlling potentially toxic element behaviour in urban soils, El Tebbin, Egypt

Population Ecology and Economic Importance of Calotropis procera as an Exotic Medicinal Plant

Vegetation Analysis of Some Wetland Habitats in Central Region of Saudi Arabia

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