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Seasonal variations in phytodesalination capacity of two perennial halophytes in their natural biotope

Rabhi, M; Karray-Bouraoui, N; Medini, R; Attia, H; Athar, H; Abdelly, C; Smaoui, A

Journal of Biological Research. 14:181-189.

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Abstract

In Soliman sabkha (NE Tunisia), Tecticornia indica and Suaeda fruticosa tufts were divided into three size classes (small, medium, and big) in which the shoot sodium and potassium contents were determined in July 2007 and February 2008. Shoot dry weights per tuft and per hectare were estimated. Soil samples (20 upper centimeters) were taken from inside and outside the halophyte tufts and analyzed for electrical conductivity (EC1/10) and soluble sodium content. We found that these two parameters were significantly lower in the soil from inside the tufts than in the surrounding soil. This effect was more pronounced in winter (February 2008) when EC1/10 inside halophyte tufts was 63 to 72% lower than outside. In July 2007, the relevant reduction of EC1/10 inside the tufts was 55%. Soluble sodium content was reduced by 70.5% in winter and only 31 to 37% in summer. The ecosystem productivity was about 8.6 tonnes dry weight per hectare (t DW ha-1) with higher sodium than potassium contents (about 0.646 t Na+ ha-1 in summer and 0.752 tonnes Na+ ha-1 in winter). Regardless of the season, T. indica exhibited much higher phytodesalination capacity (77.7-94.4% of the whole shoot-removed sodium). For S. fruticosa, the decrease in soil salinity was due to roots that released sodium ions from the exchange sites and facilitated their leaching to the deeper horizons. From an ecological point of view, phytodesalination and sodium leaching enhancement are interesting processes since they provide glycophytes with a microhabitat suitable for their development, which maintains the biodiversity within the saline ecosystem.

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Volume:
14
Start page:
181
End page:
189
Total:
9
Pagination:
181-189
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  • Related website http://www.scopus.com/inward/record.url?eid=2-s2.0-78149238048&partnerID=40&md5=fd94bbb2141672175a89762e2c6e2c32
General notes:
  • 1790045X (ISSN) Export Date: 27 March 2012 Source: Scopus Language of Original Document: English Correspondence Address: Rabhi, M.; Laboratoire des Plantes Extrêmophiles, Centre de Biotechnologie de Borj-Cédria, B. P. 901, Hammam-Lif 2050, Tunisia; email: mokdedrabhi@yahoo.fr References: Abdelly, C., Lachâal, M., Grignon, C., Soltani, A., Hajji, M., Association épisodique d'halophytes strictes et de glycophytes dans un écosystème hydromorphe sale en zone semi-aride (1995) Agronomie, 15, pp. 557-568; Ahmad, N., Qureshi, R.H., Qadir, M., Amelioration of a calcareous saline-sodic soil by gypsum and forage plants (1990) Land Degradation and Rehabilitation, 2, pp. 277-284; Barazani, O., Golan-Goldhirsh, A., Salt-driven interactions between Pistacia lentiscus and Salsola inermis (2009) Environmental Science and Pollution Research, 16, pp. 855-861; Benwahhoud, M., Jouad, H., Eddouks, M., Lyoussi, B., Hypoglycemic effect of Suaeda fruticosa in streptozotocin- induced diabetic rats (2001) Journal of Ethnopharmacology, 76, pp. 35-38; Bhatt, J.G., Indirakutty, K.N., Salt uptake and salt tolerance by sunflower (1973) Plant and Soil, 39, pp. 457-460; Helalia, A.M., El-Amir, S., Abou-Zeid, S.T., Zaghloul, K.F., Bio-reclamation of saline-sodic soil by amshot grass in northern Egypt (1992) Soil and Tillage Research, 22, pp. 109-115; Kursakova, V.S., The effect of perennial herbs on the physical properties of saline soils (2006) Eurasian Soil Science, 39, pp. 748-752; Kumar, A., Abrol, I.P., Studies on the reclaiming effect of Karnal-grass and para-grass grown in a highly sodic soil (1984) The Indian Journal of Agricultural Sciences, 54, pp. 189-193; le Houérou, H.N., Ionesco, T., (1973) Appétibilité Des Espèces Végétales De La Tunisie Steppique, , AG-TUN 71/ 525, FAO, Rome; Lipiec, J., Hatano, R., Quantification of compaction effects on soil physical properties and crop growth (2003) Geoderma, 116, pp. 107-136; Munns, R., Tester, M., Mechanisms of salt tolerance (2008) Annual Review of Plant Biology, 59, pp. 651-681; Pottier-Alapetite, G., (1979) Flore De La Tunisie. 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Manchester eScholar ID:
uk-ac-man-scw:158099
Created by:
Athar, Habib-Ur-rehman
Created:
27th March, 2012, 16:03:50
Last modified by:
Athar, Habib-Ur-rehman
Last modified:
20th May, 2013, 20:59:25

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