Vegetation diversity in natural and agro-ecosystems of arid lands

Hegazy, Ahmad K.; Fahmy, Gamal M.; Ali, Mahdi; Gomaa, Nasr H.

doi:10.1556/comec.5.2004.2.3

Cited by 30 publications

(31 citation statements)

References 31 publications

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“…As indicated by CCA organic matter, Na, CaCO 3 , Mg, pH and salinity (electrical conductivity) contribute significantly to the distribution of plant species and plant communities in the study area. This finding had been reported by (Abd El-Ghani and Amer, 2003;Hegazy et al, 2004;SUMAMAD, 2014;Salama et al, 2014). Abd El-Ghani (1998) indicated that organic matter played an important role as a key element in soil fertility, and distribution of plant species.…”

Section: Discussionsupporting

confidence: 72%

Effect of the recent land use on the plant diversity and community structure of Omayed Biosphere Reserve, Egypt

Ahmed

Fawzy

Saeed

et al. 2015

Global Ecology and Conservation

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a b s t r a c tThe present study aims at describing and analysing the floristic composition and vegetation types, as well as determining the effect of recent land uses on the vegetation structure. It aims also at identifying the alien plants species and elucidating the impact of these species on the plant diversity and community structure of the study area. One hundred and ninety stands were selected monthly for this study, 145 species were recorded (69 perennials and 76 annuals) related to 83 genera, 40 families in 9 identified habitats in El-Omayed Biosphere Reserve (coastal sand dunes, salt marshes, saline depression, nonsaline depression, inland ridges, inland plateau, irrigation canals, road sides and cultivated lands). Therophytes were the most represented life form. Three habitat groups resulted after the application of TWINSPAN and DCA as classification and ordination techniques: 2 represented the natural habitats and one represented the urban and cultivated habitats. Group I represented coastal dunes and salt marshes GII: saline depressions, non-saline depressions, inland plateau and inland ridges and GIII: irrigation canals, road sides and cultivated lands. Coastal dunes had the highest species richness (α-diversity), followed by cultivated lands, while inland plateau had the lowest; but saline depressions had the highest species turnover (β-diversity). Non-saline depressions had the highest relative evenness, while saline depressions had the highest relative concentration of dominance. Coastal dunes had highest values of calcium carbonates and calcium ions, and salt marshes had the highest salinity, pH, potassium and sodium contents, but cultivated lands had the highest values of silt, clay and organic matter. The diagram resulting from CCA showed an influence of most soil variables, except nitrogen, calcium and potassium. Twenty two species were recorded for the first time in the study area. The recent land use (overgrazing, wood cutting and collecting, construction of summer resorts and irrigation canals and agricultures) led to the emergence of new invasive species, which may severely affect the plant diversity and community structure of this hot spot of biodiversity in Egypt.

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Section: Discussionsupporting

confidence: 72%

Effect of the recent land use on the plant diversity and community structure of Omayed Biosphere Reserve, Egypt

Ahmed

Fawzy

Saeed

et al. 2015

Global Ecology and Conservation

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“…The wide distribution and the dominancy of E. colona over other weed species which reported in other studies (Shaltout et al, 1992;Hegazy et al, 2004) and also in this study may be attributed to its phytotoxic stress on other weed species which documented in the present study. El-Khatib (2000) pointed out that allelopathic plants tend to form pure dense patches with relatively few other species growing within their vicinity.…”

Section: Test Species a G R A E C I Z A N S A H Y B R I D U S B supporting

confidence: 78%

“…This weed is also an alternate host of diseases, insects, and nematodes (Holm et al, 1991). E. colona is widespread throughout different habitat types and is a dominant species of weed communities of summer crops and orchards in Egypt (Shaltout et al, 1992;Hegazy et al, 2004). It is characterized by a high relative growth rate (RGR) together with a high dry matter investment into leaves, during seedling and juvenile stages.…”

Section: Introductionmentioning

confidence: 99%

Phytotoxic effects of Echinochloa colona (L.) Link. (Poaceae) extracts on the germination and seedling growth of weeds

Gomaa

AbdElgawad

2012

Span. j. agric. res.

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This paper aims to study the phytotoxic potential of Echinochloa colona in order to explore its potential as bioherbicide. In this way, the phytotoxic effects of the most active fraction and pure compound from methanol (MeOH) extract of E. colona shoots on germination and seedling growth of ten weed species and on E. colona itself were evaluated. A lettuce seed bioassay indicated that dichloromethane (CH 2 Cl 2 ) soluble fraction of MeOH extract had the most phytotoxic activity. The most phytotoxic active compound of CH 2 Cl 2 fraction was isolated and identified as tricin. ) significantly stimulated germination and seedling growth of some test species. There was no significant effect of the low concentration of tricin (50 µmol L -1 ) on germination and elongation of roots and shoots of species. Higher concentrations of CH 2 Cl 2 fraction (500, 1000 mg L -1 ) and tricin (100, 200 µmol L -1 ) inhibited germination and seedling growth of most species. The results suggest that CH 2 Cl 2 fraction and tricin might be potentially useful as bioherbicide for weed control in agriculture.Additional key words: allelochemicals; bioherbicide; tricin; weed control. ResumenEfectos fitotóxicos de extractos de Echinochloa colona (L.) Link. (Poaceae) sobre la germinación y el crecimiento de plántulas de malas hierbasEn este trabajo se estudia el efecto fitotóxico de la planta Echinochloa colona para explorar su potencial como herbicida natural. Se evaluaron los efectos fitotóxicos de la fracción más activa y del compuesto más puro del extracto de metanol de tallos de E. colona sobre la germinación de semillas y el crecimiento de plántulas de diez malas hierbas incluyendo E. colona. El ensayo biológico en semillas de lechuga indicó que la fracción soluble del diclorometano (CH 2 Cl 2 ) mostró la actividad fitotóxica más importante. Se aisló e identificó el componente activo más fitotóxico del CH 2 Cl 2 , que fue la tricina. La fitotoxicidad de estos compuestos se analizó con tres concentraciones distintas de CH 2 Cl 2 (100, 500 y 1000 mg L -1 ) y tres de tricina (50, 100, 200 µmol L -1 ) sobre la germinación de semillas y el crecimiento de plántulas de las especies Portulaca oleracea, Corchorus olitorius, Brachiaria reptans, Euphorbia heterophylla, Dinebra retroflexa, Hibiscus trionum, Amaranthus graecizans, Amaranthus hybridus, Convolvulus arvensis, Setaria pumila, y también E. colona. La concentración 100 mg L -1 de CH 2 Cl 2 estimuló significativamente la germinación de semillas y el crecimiento de plántulas de algunas de las especies de estudio. No hubo ningún efecto significativo de la concentración 50 µmol L -1 de tricina sobre la germinación de semillas o la elongación de raíces y tallos de las especies. Concentraciones más altas de CH 2 Cl 2 (500, 1000 mg L -1 ) y tricina (100, 200 µmol L -1 ) inhibieron la germinación de semillas y el crecimiento de plántulas de la mayoría de las especies. Los resultados sugieren que la fracción soluble del CH 2 Cl 2 y la tricina podrían ser potencialmente empleadas como herbicida...

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“…Only one ephemeral (Kochia indica) is recorded in all communities. These results are in accordance with those obtained by Mossallam et al (2009), Abd El-Ghani andFawzy (2006), Hegazy et al (2004) and Abd El-Ghani (2000).…”

Section: Sociological Range Of Speciessupporting

confidence: 93%

Ecological Study on Vegetation of Abu Tartur Plateau, the New Valley, Egypt

Ziada¹,

Alshamy²,

Jalal³

2015

J. of Environmental Science and Technology

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The present study deals with the ecology of the vegetation inhabiting Abu Tartur plateau, a part of the rainless region extending between Kharga and Dakhla oases in Western desert of Egypt including recognition of the plant communities. There were six community types dominated by: Astragalus vogelii, Bassia muricata, Morettia philaeana, Alhagi graecorum, Farsetia aegyptia and Schouwia purpurea. For each community the vegetation analysis and habitat conditions are given. A total 56 plant species belonging to 23 families were identified from the six communities. Poaceae, Chenopodiaceae, Asteraceae and Fabaceae were the predominant families. The majority of the species were of Irano-Turanian (24%), Saharo-Sidian (19%) and Saharo-Arabian (17%) distribution. Therophytes and chamaephytes had the highest contribution to the life forms spectra. Soil moisture is the main environmental factor governing the pattern of plant growth. It is affected by depth of underground water, depth of surface deposits and soil texture. These findings may lead to a better understanding of the vegetation of the different habitats found in Abu Tartur area which was not described before in other ecological work.

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Vegetation diversity in natural and agro-ecosystems of arid lands

Cited by 30 publications

References 31 publications

Effect of the recent land use on the plant diversity and community structure of Omayed Biosphere Reserve, Egypt

Effect of the recent land use on the plant diversity and community structure of Omayed Biosphere Reserve, Egypt

Phytotoxic effects of Echinochloa colona (L.) Link. (Poaceae) extracts on the germination and seedling growth of weeds

Ecological Study on Vegetation of Abu Tartur Plateau, the New Valley, Egypt

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