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Gradient analysis of canal vegetation in nile delta region

, : Gradient analysis of canal vegetation in nile delta region. Feddes Repertorium 102(7-8): 639-645

The present study aims at evaluating the behaviour of 15 common weeds [Cyperus alopecuroides, Phragmites australis, Polygonum salicifolium, Conyza dioscoridis, Cynodon dactylon, Rumex dentatus, Aster squamatus, Polypogon monospeliensis, Ethulia conyzoides, Echinochloa staginum, Sonchus olerauus, Chenopodium murale, Panicum repens, Eichhornia crassipes, Potamogeton crispus] distributed along the net of canals and drains in the Middle Delta region, in relation to environmental gradients of some soil variables. Some species have significant simple correlations (either positive or negative) with certain soil variables (salinity, CaCO3, nitrogen and organic matter). Some other species have monomodal behaviours along some soil gradients, while all the all the examined species have bimodal behaviours along, at least, one soil gradient. The possible reasons that could be lead to bimodality were discussed.


DOI: 10.1002/fedr.19911020714

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