This publication is an outcome of the 15th Meeting of the FAO-CIHEAM Inter-regional Cooperative Research and Development Sub-Network on Mediterranean Pastures and Fodder Crops titled Ecosystem services and socio-economic benefits, organised in Orestiada (Greece) from 12 to 14 April 2014, by the Mediterranean Agronomic Institute of Zaragoza/International Centre for Advanced Mediterranean Agronomic Studies, the Democritus University of Thrace, the Aristotle University of Thessaloniki and the Hellenic Range and Pasture Society. These Proceedings include 90 papers presented at the Meeting, covering a range of topics allocated into four sessions: (1) Managing ecosystem services and livestock production in the Mediterranean region; (2) Improvement of range, pasture and forage species including alternative uses; (3) Socio-economic benefits of sustainable grassland management; (4) Rehabilitation ; and a Round Table on Connecting research, policy and stakeholders challenges for the sustainability of grasslands. There are socio-economic and environmental differences between the different Mediterranean regions, but they share common issues on grasslands sustainability and research. Multidisciplinary investigations are needed to identify the best-adapted and most productive grassland species and mixtures along with the most appropriate grazing management to produce high-quality livestock products. Multidisciplinary research is also needed to monitor the pastoral resources, environmental outputs and ecological services associated with Mediterranean grasslands, to ensure a better understanding of their complexity and to make informed management decisions and take measures for climate change mitigation. More on-farm experimentation and participatory knowledge transfer to farmers are also required. socio-economic benefits Mediterranean grasslands (including rangelands, pastures, meadows, and fodder crops) are important resources covering up to 48% of the whole region. Although these ecosystems are a key element in the production of high quality animal products and in the livelihoods of producers, they also provide a range of ecosystem services besides forage production, such as biodiversity conservation, habitat for wildlife, carbon fixation, prevention of erosion and nutrient storage. CIHEAM socio-economic benefits socio-economic benefits 2016 ISBN: 2-85352-556-2 ISSN: 1016-121-X A 114
CIHEAM Centre International de Hautes Etudes Agronomiques Méditerranéennes International Centre for Advanced Mediterranean Agronomic Studies Président / President: Masum BURAK Secrétaire Général / Secretary General: Cosimo LACIRIGNOLA 11, rue Newton, 75116 Paris, France Tél.: +33 (0) 1 53 23 91 00 - Fax: +33 (0) 1 53 23 91 01 / 02 secretariat@ciheam.org www.ciheam.org Le Centre International de Hautes Etudes Agronomiques Méditerranéennes (CIHEAM) a été créé, à l'initiative conjointe de l'ocde et du Conseil de l'europe, le 21 mai 1962. C'est une organisation intergouvernementale qui réunit aujourd'hui treize Etats membres du bassin méditerranéen (Albanie, Algérie, Egypte, Espagne, France, Grèce, Italie, Liban, Malte, Maroc, Portugal, Tunisie et Turquie). Le CIHEAM se structure autour d'un Secrétariat général situé à Paris et de quatre Instituts Agronomiques Méditerranéens (IAM), localisés à Bari (Italie), Chania (Grèce), Montpellier (France) et Saragosse (Espagne). Avec au cœur de son action trois missions fondamentales (formation, recherche, coopération), le CIHEAM s'est progressivement imposé comme une référence dans ses domaines d'activité : l'agriculture, l'alimentation et le développement rural durable en Méditerranée. Founded in 1962 at the joint initiative of the OECD and the Council of Europe, the International Centre for Advanced Mediterranean Agronomic Studies (CIHEAM) is an intergovernmental organisation comprising thirteen member countries from the Mediterranean Basin (Albania, Algeria, Egypt, France, Greece, Italy, Lebanon, Malta, Morocco, Portugal, Spain, Tunisia and Turkey). CIHEAM is made up of a General Secretariat based in Paris and four Mediterranean Agronomic Institutes (MAI) located in Bari (Italy), Chania (Greece), Montpellier (France) and Zaragoza (Spain). In pursuing its three central missions (education, research and cooperation), CIHEAM has become a reference in its fields of activity: Mediterranean agriculture, food and sustainable rural development. IAM Instituts Agronomiques Méditerranéens Mediterranean Agronomic Institutes Bari - Chania - Montpellier - Zaragoza IAM-Bari Dir.: Cosimo LACIRIGNOLA Via Ceglie, 9 70010 Valenzano, Bari, Italy Tel.: (+39) (080) 4606 111 - Fax: (+39) (080) 4606 206 iamdir@iamb.it www.iamb.it IAM-Montpellier Dir.: Pascal BERGERET 3191, Route de Mende 34093 Montpellier Cedex 5, France Tel.: (+33) (0)4 67 04 60 00 - Fax: (+33) (0)4 67 54 25 27 pascal.bergeret@iamm.fr et/and sciuto@iamm.fr www.iamm.fr IAM-Chania Dir.: Giorgios BAOURAKIS P.O. Box 85 73100 Chania, Crete, Greece Tel.: (+30) 28210 35000 - Fax: (+30) 28210 35001 baouraki@maich.gr www.maich.gr IAM-Zaragoza Dir.: Javier SIERRA Avda. Montañana, 1005 50059 Zaragoza, Spain Tel.: (+34) 976 716000 - Fax: (+34) 976 716001 iamz@iamz.ciheam.org www.iamz.ciheam.org
The effect of grazing exclusion on vegetation characteristics and plant community structure in arid lowland pastures S. Hassan 1 *, S. Ates 1, A. Kaabneh 2 and M. Louhaichi 1 1 International Center for Agricultural Research in the Dry Areas (ICARDA) PO Box 950764, Amman 11195 (Jordan) 2 The National Center for Agricultural Research & Extension (NCARE), Amman, (Jordan) *e-mail: s.hassan@cgiar.org Abstract. Rangelands are the mainstay of pastoral livelihoods worldwide. Within rangelands, there are landscape depressions or lowlands characterized by high production potentials with their unique edaphic and hydrologic properties. The purpose of this ongoing research is to evaluate the effect of grazing exclusion on the vegetation characteristics and plant community structure in the arid lowland pastoral ecosystems. Plots were randomly identified within two distinct lowlands in Majidya and Sabha, in the Jordanian Badia. Preliminary results indicate that the total biomass and plant density widely differed between the open grazed and protected areas (P<0.001) in both sites. Total annual dry matter production was 954 kg ha-1 for protected and 151 kg ha-1 for open grazed areas in Majidya and 1749 kg ha-1 for protected and 20 kg ha-1 for open grazed areas in Sabha. The average plant densities in open grazed areas were 29 and 16 plants/m2, compared to 83 and 612 plants/m2 in protected areas in Majidya and Sabha, respectively. These results indicate that plant community structure is greatly affected by livestock grazing and that a site s ability to recover from disturbance over time may be limited. Therefore, carefully planned grazing management is needed to achieve greater rangeland productivity and diversity. Keywords. Badia Grazing management Pasture production Plant diversity. Effet de l'exclusion de pâturage sur les caractéristiques de la végétation et la structure de la communauté végétale dans les parcours des zones arides Résumé. Les parcours représentent un pilier important des moyens de subsistance pour les communautés pastorales à travers le monde. Au sein des parcours, il existe des zones de dépression ou des terres basses qui ont des propriétés édaphiques et hydrologiques spécifiques. L objectif de la recherche en cours est d évaluer l effet de la protection contre le pâturage sur les caractéristiques de la végétation et la structure de la communauté végétale dans les écosystèmes pastoraux des dépressions dans les zones arides. Des parcelles ont été identifiées au hasard dans deux plaines à Majidya et Sabha, dans la Badia Jordanienne. Les résultats préliminaires montrent que la biomasse totale et la densité des plantes étaient différentes entre les zones protégées et les zones pâturées (P<0.001) au niveau des deux sites. La matière sèche totale produite annuellement a atteint respectivement 954 kg ha -1 et 151 kg ha -1 pour les zones protégées et les zones pâturées au site de Majidya et les valeurs correspondantes étaient de 1749 kg ha -1 et 20 kg ha -1 pour le site de Sabha. La densité moyenne des plantes dans les zones pâturées était de 29 et 16 plants/m 2 respectivement à Mjidya et Sabha en comparaison à 83 et 612 plants/m 2 dans les parcelles protégées pour les mêmes sites. Ces résultats montrent que la structure communautaire de la végétation est très affectée par le pâturage et que la capacité des écosystèmes à se remettre des grandes perturbations est limitée dans le temps. Par conséquent, une gestion raisonnée des pâturages est indispensable pour garantir une plus grande productivité et diversité dans les parcours. Mots-clés. Badia Gestion du pâturage Production pastorale Diversité des plantes. I Introduction Rangelands cover almost a half of the Earth's land surface (Schimel, 2010). Traditionally, rangelands are a major source of feed for the pastoral livestock production system (Kassahun et al., 2008). Rangelands also provide vital ecological resources that include; nutrient cycling, Options Méditerranéennes, A, no. 114, 2016 socio-economic benefits 391
filtering of pollution, medicinal herbs, and the preservation of biodiversity for millions of resource-poor agro-pastoral farmers (Louhaichi et al., 2009). However, these rangelands are suffering from the encroachment of cultivations, overgrazing and harsh climatic conditions particularly recurrent droughts. Within these vast areas, lowlands which are broad dry basins exhibit localized high vegetation productivity and unique edaphic and hydrologic properties. The purpose of this research is to evaluate the effect of short-term grazing on vegetation characteristics and plant community structure within two different lowlands located in the Jordanian Badia, and to provide other options for sustainable development of these key areas. II Materials and methods Two lowland pastures were randomly selected. The sites are located in Majidya (latitude 31 43 48 longitude 36 07 25.03 altitude 835 m, long term average annual rainfall = 100 mm, Rainfall of the growing season begins in November and ends in May = 134 mm) and Sabha (latitude 32 17 04.2, longitude 36 27 53.28 altitude 754.5 m, average annual rainfall = 130 mm, growing season rainfall = 119 mm). Both sites are located in the Jordanian Badia. The main grazing system is the semi-nomadic. In most cases the number of livestock is much higher than the available feed. Grazing periods start usually in late winter and early spring, this leads to reduced cover, resulting in loss of plant reproduction in the next season. Vegetation sampling took place during the peak standing crop in the spring of 2015. Each lowland pasture site (5 ha total area) had an open grazing and a protected section. In each site ten 1 m 1 m quadrats were randomly placed to estimate plant biomass, density, and species diversity. Above-ground biomass was harvested by manually clipping plants 2.5 cm above the soil surface within each quadrat. In the lab, clipped plants were oven dried for 72 h at 70 C and then weighed in order to estimate the total dry weight. The percentage of total biomass for above-ground plant parts was estimated on an individual species basis for all species sampled. Plant density was calculated as the number of individuals for each species that were found within a placed quadrat (m 2 ). Cover and density were compared among the locations using one-way ANOVA, followed by Duncan test. Differences between means were considered significant if P values were <0.05. Comparison of means for vegetation characteristics under grazing and protected treatments was undertaken using a t-test. Means and standard error values were calculated for all comparisons. All computations were carried out in SAS (SAS, 2004). III Results and discussion The optimal use of rangeland resources depends on many factors such as understanding of the changes of seasonal biomass production as affected by climate, grazing management, and proper use management. Productivity (kg ha -1 ) is a measure of the available herbaceous plant species biomass per surface unit. While, plant density is the number of individuals of each taxon per surface unit. Both measurements represent key indicators for understanding the condition and trend of rangeland resources at the local scale. A proper management scheme is required for the sustainability of these natural resource base. Previous studies have reported that short term protection from grazing have positive effects on productivity (biomass) and biodiversity (species richness) of rangeland ecosystems (Mengistu et al., 2005, Louhaichi et al., 2012). The total biomass and plant density widely differed between the open grazed and protected areas (P<0.001) in both sites. Total annual dry matter production in Majidya was 954 kg ha -1 for protected and 151 kg ha -1 for open grazed areas (Fig. 1). In Sabha total annual dry matter production was 1,749 kg ha -1 for protected and 20 kg ha -1 for open grazed areas. Similar results 392 Options Méditerranéennes, A, no. 114, 2016
have been reported within similar landscapes by Louhaichi et al. (2012). This is due to the fact that overgrazing has negative impact on biomass production (Abdulatife and Ebro, 2015). Our results show that the main effect of protection from grazing, the site and their interaction significantly affected the plant density (plant /m 2 ), total biomass (kg ha -1 ) and the percent (%) of Anabasis syriaca (unpalatable shrub species that invades disturbed land). Plant cover (%) was affected only by protection from grazing and its interaction with the site treatment (P<0.05). Fig. 1. Total biomass production (kg ha -1 ) in protected and open grazed sites of two lowland pastures. Fig. 2. Plant density (plants/m2) in protected and open grazed sites of two lowland pastures. The average plant densities in open grazed areas were 29 plants/m 2 in Majidya and 16 plants/m 2 in Sabha. Plant densities increased in protected areas with 83 plants/m 2 in Majidya and 612 plants/m 2 in Sabha (Fig. 2). In the Majidya site, the protection treatment had a significant effect on reducing the percentage (%) of A. syriaca from 27% of the total plant cover in open grazed areas to 14% in protected areas. Table 1. Main family names of species recorded in protected and open grazed areas of Jordan (%) Family Protected Open grazed Annual Perennial Annual Perennial Poaceae 22 5 13 0 Asteraceae 15 0 7 13 Brassicaceae 10 2 13 0 Caryophyllaceae 0 7 0 13 Fabaceae 5 0 13 0 Amaranthaceae 0 7 0 7 Capparaceae 0 0 0 7 Malvaceae 0 5 0 7 Plantaginaceae 2 5 0 0 Resedaceae 0 0 7 0 Other 8 7 0 0 The plant species composition found in the two lowland pastures represent 15 families mainly (Poaceae, Asteraceae, Brassicaceae, Caryophyllaceae, and Fabaceae). Differences between the number of plants that belong to each family in the protected areas and the open grazed areas were observed. In the protected areas, 25% of the species are members of Poaceae socio-economic benefits 393
family compared to 13% in the open grazed areas. Some species were more abundant in the open grazed areas than the protected areas. Species from Asteraceae, Brassicaceae, Caryophyllaceae, and Fabaceae had respectively 20, 13, 13 and 13% in open grazed areas and 15, 12, 7 and 7% in the protected areas. However, a greater availability of the other species in the protected areas was found (Table 1). Grazing exclusion increased herbaceous species richness mainly that related to annual grasses due to the fact that when overgrazing occur during spring annuals are not able to re-seed. These results showed significant variations in terms of plant biodiversity between protected and open grazed areas. Furthermore, the changes in plant composition resulted from overgrazing can involve the replacement of desirable and palatable plants by unpalatable species such as A. syriaca which is an unpalatable invasive shrub. This is illustrated through the state and transition models which explain how rangeland ecosystems response to natural and/or management-induced disturbances (Knapp et al., 2011). The density of perennials in the open grazing treatments found to be higher than annuals, this may indicate that grazing and reduced perennial biomass is important for perennial establishment. IV Conclusions Lowland pastures have the potential to play an important role in the intensification and diversification of pastoral production system and provide a favorable environment for biodiversity conservation. Results of this research suggest that proper grazing is a potential tool for enhance pasture biodiversity, improve biomass availability and vegetation structure not only to maintain but also to improve range sustainability and enhance productivity. Particularly, lowland pastures, could represent a valuable source of feed for livestock, mainly during the dry season when resources are often limited. Acknowledgements The authors would like to thank ICARDA, the OPEC Fund for International Development (OFID) and the CGIAR Research Program on Dryland Systems (CRP DS) for their support and funding. References Abdulatife M. and Ebro A., 2015. Floristic composition, biomass production and chemical composition of major herbaceous species in Chifra district of Afar Regional State, Ethiopia. In: Forest Research, S3-003. Kassahun A., Snyman H. A. and Smit G. N., 2008. Impact of rangeland degradation on the pastoral production systems, livelihoods and perceptions of the Somali pastoralists in Eastern Ethiopia. In: Journal of Arid Environments, 72, p. 1265-1281. Knapp C. N., Fernandez-Gimenez M. E., Briske D. D. Bestelmeyer B. T. and Wu X. B., 2011. An assessment of state and-transition models: perceptions following two decades of development and implementation. In: Rangeland Ecology & Management, 64(6), p. 598-606. Louhaichi M., Ghassali F., Salkini A. K. and Petersen, S. L., 2012. Effect of sheep grazing on rangeland plant communities: case study of landscape depressions within Syrian arid steppes. In: Journal of Arid Environments, 79, p.101-106. Louhaichi M., Salkini A, K. and Petersen, S. L., 2009. The effect of small ruminant grazing on the plant community characteristics of semi-arid Mediterranean ecosystems. In: International Journal of Agriculture and Biology, 11, p. 681-689. Mengistu T., Teketay D., Hulten H. and Yemshaw Y., 2005. The role of enclosures in the recovery of woody vegetation in degraded dryland hillsides of central and northern Ethiopia. In: Journal of Arid Environments, 60, p. 259-281. SAS, 2004. NC, USA, SAS OnlineDoc 9.1.3. Schimel D.S., 2010. Drylands in the Earth system. In: Science, 327, p. 418-419. 394 Options Méditerranéennes, A, no. 114, 2016
This publication is an outcome of the 15th Meeting of the FAO-CIHEAM Inter-regional Cooperative Research and Development Sub-Network on Mediterranean Pastures and Fodder Crops titled Ecosystem services and socio-economic benefits, organised in Orestiada (Greece) from 12 to 14 April 2014, by the Mediterranean Agronomic Institute of Zaragoza/International Centre for Advanced Mediterranean Agronomic Studies, the Democritus University of Thrace, the Aristotle University of Thessaloniki and the Hellenic Range and Pasture Society. These Proceedings include 90 papers presented at the Meeting, covering a range of topics allocated into four sessions: (1) Managing ecosystem services and livestock production in the Mediterranean region; (2) Improvement of range, pasture and forage species including alternative uses; (3) Socio-economic benefits of sustainable grassland management; (4) Rehabilitation ; and a Round Table on Connecting research, policy and stakeholders challenges for the sustainability of grasslands. There are socio-economic and environmental differences between the different Mediterranean regions, but they share common issues on grasslands sustainability and research. Multidisciplinary investigations are needed to identify the best-adapted and most productive grassland species and mixtures along with the most appropriate grazing management to produce high-quality livestock products. Multidisciplinary research is also needed to monitor the pastoral resources, environmental outputs and ecological services associated with Mediterranean grasslands, to ensure a better understanding of their complexity and to make informed management decisions and take measures for climate change mitigation. More on-farm experimentation and participatory knowledge transfer to farmers are also required. socio-economic benefits Mediterranean grasslands (including rangelands, pastures, meadows, and fodder crops) are important resources covering up to 48% of the whole region. Although these ecosystems are a key element in the production of high quality animal products and in the livelihoods of producers, they also provide a range of ecosystem services besides forage production, such as biodiversity conservation, habitat for wildlife, carbon fixation, prevention of erosion and nutrient storage. CIHEAM socio-economic benefits socio-economic benefits 2016 ISBN: 2-85352-556-2 ISSN: 1016-121-X A 114