The Rangeland Journal The Rangeland Journal Society
Rangeland ecology and management

Using trees as a restoration tool in Tunisian arid areas: effects on understorey vegetation and soil nutrients

K. Jeddi A and M. Chaieb A B

A Department of Biology, Faculty of Sciences, University of Sfax, 3000 – B.P. 1171 Sfax, Tunisia.

B Corresponding author. Email:

The Rangeland Journal 31(4) 377-384
Submitted: 13 November 2008  Accepted: 26 June 2009   Published: 27 November 2009


A field experiment was conducted in an afforested Stipa tenacissima L. steppe in arid southern Tunisia to evaluate the effect of three tree species (Acacia salicina Lindl., Pinus halepensis Mill. and Eucalyptus occidentalis Endl.) on understorey vegetation and soil nutrients. For each tree species, two subhabitats were distinguished: under the canopy, and out in the open. Organic carbon, total N, available P and pH were higher under the canopies of the three tree species than out in the open, and the effect was more pronounced in the top 10 cm of soil. Similarly, plant cover, biomass, richness and diversity were significantly higher under tree canopies. Some species such as Plantago amplexicaulis Cav., Helianthemum kahiricum Del. and Artemisia campestris L., which use large amounts of soil nutrients, showed a strong preference for areas under the canopy. Among the three tree species, Acacia salicina had the strongest positive effect on soil nutrients and understorey vegetation, and, thus, may be more useful for restoring arid areas and creating areas of enhanced soil nutrients than Pinus or Eucalyptus.

Additional keywords: arid ecosystem, restoration, soil fertility, subhabitat, vegetation dynamic, woody plants.


Abdallah F. Noumi Z. Touzard B. Ouled Belgacemc A. Neffati M. Chaieb M. 2008 The influence of Acacia tortilis (Forssk.) subsp. raddiana (Savi) and livestock grazing on grass species composition, yield and soil nutrients in arid environments of South Tunisia. Flora 203 116 125

Abule E. Smit G. N. Snyman H. A. 2005 The influence of woody plants and livestock grazing on grass species composition, yield and soil nutrients in the middle awash valley of Ethiopia. Journal of Arid Environments 60 343 358

AFNOR (1987). ‘Recueil de normes françaises, qualité des sols, méthodes d’analyses.’ (Association française de normalisation: France.)

Aguilera L. E. Rodríguez J. L. Meserve P. L. 1999 Variation in soil micro-organisms and nutrients underneath and outside the canopy of Adesmia bedwellii (Papilionaceae) shrubs in arid coastal Chile following drought and above average rainfall. Journal of Arid Environments 42 61 70 doi:10.1006/jare.1999.0503

Akpo L. E. Grouzis M. 2004 Interactions arbre/herbe en bioclimat semi-aride: influence du pâturage. Sécheresse 15 253 261

Amundson R. G. Ali A. R. Belsky A. J. 1995 Stomatal responsiveness to changing light intensity increases rain use efficiency of below-tree-crown vegetation in tropical savannas. Journal of Arid Environments 29 139 153

Augusto L. Dupouey J. Ranger J. 2003 Effects of tree species on understory vegetation and environmental conditions in temperate forests. Annals of Forest Science 60 823 831 doi:10.1051/forest:2003077

Bautista, S. , and Vallejo, R. (2002). Spatial variation of post-fire plant recovery in Aleppo pine forests. In ‘Fire and Biological Processes’. (Eds L. Trabaud and R. Prodon.) pp. 13–24. (Backhuys Publisher: Leiden, The Netherlands.)

Belsky A. J. Amundson R. G. Duxbury J. M. Riha S. J. Mwonga S. W. 1989 The effects of trees on their physical, chemical, and biological environments in a semiarid savannah in Kenya. Journal of Applied Ecology 26 1005 1024 doi:10.2307/2403708

Belsky J. A. Canham C. D. 1994 Forest gaps and isolated savanna trees: an application of patch dynamics in two ecosystems. Bioscience 44 77 84 doi:10.2307/1312205

Berg B. Berg M. Cortina J. Johansson M. B. Gallardo A. Madeira M. Pausas J. Kartz W. Vallejo V. R. Claugherty M. C. 1999 Amounts of litterfall in some pine forests in the northern hemisphere, especially Scots pine. Annals of Forest Science 56 625 639 doi:10.1051/forest:19990801

Callaway R. M. 1995 Positive interactions among plants. Botanical Review 61 306 349 doi:10.1007/BF02912621

Caravaca F. Figueroa D. Barea J. M. Azcon-Aguilar C. Plenzuela J. Roldan A. 2003 The role of relict vegetation in maintaining physical, chemical and biological properties in an abandoned stipa-grass agroecosystem. Arid Land Research and Management 17 103 111 doi:10.1080/15324980301585

Castillo V. M. Martınez-Mena M. Albaladejo J. 1997 Runoff and soil loss response to vegetation removal in a semiarid environment. Soil Science Society of America Journal 61 1116 1121

Chaieb, M. , and Boukhris, M. (1998). ‘Flore succinte et illustrée des zones arides et sahariennes de Tunisie.’ (L’Or du Temps: Tunis, Tunisian Republic.)

Challinor D. 1968 Alteration of surface soil characteristics by four tree species. Ecology 49 286 290

Chirino, E. , Sanchez, J. R. , Bonet, A. , and Bellot, J. (2001). Effects of afforestation and vegetation dynamics on soil erosion in a semi-arid environment (SE Spain). In ‘Ecosystems and Sustainable Development III’. (Eds Y. Villacampa, C. A. Brebbia and J. L. Uso.) pp. 239–248. (WIT Press: Southampton, UK.)

Corcket E. Liancourt P. Callaway R. M. Michalet R. 2003 The relative importance of competition for two dominant grass species as affected by environmental manipulations in the field. Ecoscience 10 186 194

Cortina, J. , and Maestre, F. T. (2005). Plant effects on soils in drylands. Implications for community dynamics and dryland restoration. In ‘Tree Species Effects on Soils: Implications for Global Change’. (Eds D. Binkley and O. Menyailo.) pp. 85–118. (Kluwer Academic Publishers: Dordrecht, The Netherlands.)

Eldridge D. J. Freudenberger D. 2005 Ecosystem wicks: woodland trees enhance water infiltration in a fragmented agricultural landscape in eastern Australia. Austral Ecology 30 336 347

Eldridge D. J. Wong V. N. L. 2005 Clumped and isolated trees influence soil nutrient levels in an Australian temperate box woodland. Plant and Soil 270 331 342 doi:10.1007/s11104-004-1774-2

Emberger L. 1954 Une classification biologique des climates. Recueil des travaux du laboratoire de botanique. Série botanique 7 3 43

Fahy O. Gormally M. 1998 A comparison of plant and carabid beetle communities in an Irish oak woodland with a nearby conifer plantation and clearfelled site. Forest Ecology and Management 110 263 273

Floret, C. , and Pontanier, R. (1982). ‘L’aridité en Tunisie présaharienne, climat, sol, végétation et aménagement. Travaux et Documents de l’ORSTOM.’ (Institut français de recherche scientifique pour le développement en coopération: Paris, France.)

Greuter, W. , Burdet, H. M. , and Long, G. (1989). ‘A Critical Inventory of Vascular Plants of the Circum-Mediterranean Countries. Med-Checklist.’ (Conservatoire et jardin botaniques de la ville de Genève: Genève, Suisse.)

Grigg A. H. Mulligan D. R. 1999 Biometric relationships for estimating standing biomass litterfall and litter accumulation of Acacia salicina on mined land in Central Queensland. Australian Journal of Botany 47 807 816 doi:10.1071/BT97122

Guevarat J. C. Silva-Colomer J. H. Estevez O. R. Paez J. A. 2003 Simulation of the economic feasibility of fodder shrub plantations as a supplement for goat production in the north-eastern plain of Mendoza, Argentina. Journal of Arid Environments 53 85 98 doi:10.1006/jare.2002.1024

Hagos M. G. Smit G. N. 2005 Soil enrichment by Acacia mellifera subsp. detinens on nutrient poor sandy soil in a semi-arid southern African savanna. Journal of Arid Environments 61 47 59 doi:10.1016/j.jaridenv.2004.08.003

Hong Q. Klinka K. Sivak B. 1997 Diversity of the understory vascular vegetation in 40-year-old and old-growth forest stands on Vancouver Island, British Columbia. Journal of Vegetation Science 8 778 780

Hurlbert S. T. 1984 Pseudoreplication and the design of ecological experiments. Ecological Monographs 54 187 211

Le Houérou H. N. 1986 Salt tolerant plants of economic value in the Mediterranean basin. Reclamation and Revegetation Research 5 319 341

Le Houérou, H. N. (1987). ‘Aspects Météorologiques de la Croissance et du Développement Végétal Dans les Déserts et Les Zones Menacées de Désetification.’ (PNUE, Nairobi et OMM: Genève.)

Le Houérou H. N. Hoste C. H. 1977 Rangeland production and annual rainfall relations in the Mediterranean basin and in the Africa Sahelo-Sudanian zone. Journal of Range Management 30 181 189

Long G. 1954 Contribution a l’étude de la végétation de la Tunisie centrale. Annales du service botanique et agronomique de Tunisie 27 111 121

Lovenstein H. M. Berliner P. R. Van Keulen H. 1991 Runoff agroforestry in arid lands. Forest Ecology and Management 45 59 70

Ludwig F. De Kroon H. Berendse F. Prins H. H. T. 2004 The influence of savanna trees on nutrient, water and light availability and the understorey vegetation. Plant Ecology 170 93 105 doi:10.1023/B:VEGE.0000019023.29636.92

Maestre F. T. Cortina J. 2004 Are Pinus halepensis plantations useful as a restoration tool in semiarid Mediterranean areas? Forest Ecology and Management 198 303 317 doi:10.1016/j.foreco.2004.05.040

Maestre F. T. Cortina J. Bautista S. Bellot J. 2003 Does Pinus halepensis facilitate the establishment of shrubs under semi-arid climate? Forest Ecology and Management 176 147 160 doi:10.1016/S0378-1127(02)00269-4

Nelson, D. W. , and Sommers, L. E. (1982). Total carbon, organic carbon, and organic matter. In ‘Methods of Soil Analysis. Vol. 2’. (Ed. A. L. Page.) pp. 539–579. (American Society of Agronomy, Soil Science Society of America: Madison, WI.)

Olsen, S. R. , and Sommers, L. E. (1982). Phosphorus. In ‘Methods of Soil Analysis. Vol. 2’. (Ed. A. L. Page.) pp. 403–430. (American Society of Agronomy, Soil Science Society of America: Madison, WI.)

Parker G. G. 1983 Throughfall and stemflow in the forest nutrient cycle. Advances in Ecological Research 13 58 120

Pugnaire F. I. Armas C. Valladares F. 2004 Soil as a mediator in plant-plant interactions in a semi-arid community. Journal of Vegetation Science 15 85 92

Rehman S. Loescher R. N. Harris P. J. 1999 Dormancy breaking and germination of Acacia salicina Lindl. seeds. Seed Sciences and Technology 27 553 557

Reynolds, J. F. (2001). Desertification. In ‘Encyclopedia of Biodiversity. Vol. 2’. (Ed. S. A. Levin.) pp. 61–78. (Academic Press: London.)

Reynolds J. F. Virginia R. A. Kemp P. R. De Soyza A. G. Tremmel D. C. 1999 Impact of drought on desert shrubs: effects of seasonality and degree of resource island development. Ecological Monographs 69 69 106

Rhoades C. C. 1996 Single-tree influences on soil properties in agroforestry: lessons from natural forest and savannah ecosystems. Agroforestry Systems 35 71 94

Rhoades C. C. Eckert G. E. Coleman D. C. 1998 Effect of pasture trees on soil nitrogen and organic matter: implication for tropical montane forest restoration. Restoration Ecology 6 262 270 doi:10.1046/j.1526-100X.1998.00639.x

Rosa, M. L. , Gomes, M. F. , and Espırito-Santo, M. D. (1986). Influência de factores ecologicos e fitotecnicos na Flora espontânea de sistemas florestais da regiao de Castelo Branco. In ‘1 Congresso Florestal Nacional’. (Sociedade Portuguesa de Ciências Florestais) pp. 255–260. (Fundacao Calouste Gulbenkian: Lisboa, Portugal.)

Scholes R. J. Archer S. R. 1997 Tree–grass interactions in savannas. Annual Review of Ecology and Systematics 28 544 577 doi:10.1146/annurev.ecolsys.28.1.517

Shiva S. Bandyopadhyay J. 1983 Eucalyptus – a disastrous tree for India. The Ecologist 13 184 187

Tisdall J. M. Oades J. M. 1982 Organic matter and water-stable aggregates in soils. Journal of Soil Science 33 141 163

Tongway, D. J. , and Hindley, N. (1995). ‘Manual for Assessment of Soil Condition of Tropical Grasslands.’ (CSIRO: Canberra.)

Wezel A. Rajot J. L. Herbrig C. 2000 Influence of shrubs on soil characteristics and their function in Sahelian agro-ecosystems in semi-arid Niger. Journal of Arid Environments 44 383 398 doi:10.1006/jare.1999.0609

Whitford, W. G. (2002). ‘Ecology of Desert Systems.’ (Academic Press: London.)

Wilson B. R. 2002 The influence of scattered paddock trees on surface soil properties: a study on the Northern Tablelands of NSW. Ecological Management & Restoration 3 211 219 doi:10.1046/j.1442-8903.2002.00115.x

Wilson B. R. Growns I. Lemon J. 2007 Scattered native trees and soil patterns in grazing land on the Northern Tablelands of New South Wales, Australia. Australian Journal of Soil Research 45 199 205 doi:10.1071/SR07019

Zhang W. 1998 Changes in species diversity and canopy cover in steppe vegetation in Inner Mongolia under protection from grazing. Biodiversity and Conservation 7 1365 1381 doi:10.1023/A:1008852017493

Zhao H. L. Zhou R. L. Su Y. Z. Zhang H. Zhao L. Y. Drake S. 2007 Shrub facilitation of desert land restoration in the Horquin Sand Land of Inner Mongolia. Ecological Engineering 31 1 8 doi:10.1016/j.ecoleng.2007.04.010

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