BIBLIOGRAPHICAL NOTE ON THE SYNTAXONOMY OF THE VEGETATION OF TLEMCEN, HAFIR, MOUTAS AND ITS RESERVE (NORTH-WESTERN ALGERIA)

This study provides bibliographical note on the syntaxonomy of the vegetation of Tlemcen, Hafir, Moutas of North-western Algeria, including the associations and alliances of the different higher units found in the Hafir forest and the Moutas Reserve. In this work, we observed modifications of forest and pre-forest structures according to bioclimatic variations. However, in this region, the xericity of the climate is not the only factor destroying the plant cover, anthropization is also a degradation factor. While being aware of the negative consequences, man, through their abusive cultivation, illegal logging, overgrazing, urbanization, the depletion of natural resources;, inhibits the evolution of vegetation, participates in the replacement of a rich plant cover by another and more xerophytic plant cover with thorny and/or toxic feature. The landscape is dominated, for the most part, by open and degraded formations based on therophytes and chamaephytes, linked to Rosmarinetea and Cisto-Lavanduletea. The tree structures in Hafir and the Moutas reserve, still occupy only minimal areas subject to the destructive actions of man and his flock. These formations are still linked to the Quercetea ilicis. These ecosystems are marked by a regressive evolution (forest, pre-forest, scrub, scrubland and therophytization). Introduction In the Mediterranean basin, the forest area requires some ecological and socio-economic importance. In addition, Algerian forests, like Mediterranean forests, present significant natural resources, including a proven floristic diversity (Quézel and Médail, 2003). The forest and preforest ecosystem study has the particularity of never ending (Quézel, 2000). The status of forest, pre-forest and pre-steppe schrulands structures were clarified in Morocco by Quézel and Barbero (1981), Benabid (1985) in Tunisia by El hamrouni (1992) and Chaabane (1993), in Algeria by Djebaili (1984, 1990), Dahmani (1984), on the mountains of Tlemcen and Bouazza (1991, 1995), Amara and Bouazza (2013) on the Tlemcen region and Babali (2014) on Hafir and the Moutas reserve. The Tlemcen Mountains forests offer a very interesting model for studying the flora and vegetation evolution. The variety of landscapes, but also their differences, remain very remarkable, their distribution is conditioned by a large number of ecological factors. They are characterized by mixed groups of holm oak and Zeen oak in Hafir and Zarifet forests. Elsewhere, these are degraded groupings (Dahmani, 1997). *Corresponding author, email: naiman37@yahoo.fr Laboratory of Ecology and Management of Natural Ecosystems, Aboubekr Belkaid University, Tlemcen, Algeria. BP 18. K Tlemcen, Algeria. Email: Lecgen_tlm@yahoo.fr.


Introduction
In the Mediterranean basin, the forest area requires some ecological and socio-economic importance. In addition, Algerian forests, like Mediterranean forests, present significant natural resources, including a proven floristic diversity (Quézel and Médail, 2003). The forest and preforest ecosystem study has the particularity of never ending (Quézel, 2000).
The Tlemcen Mountains forests offer a very interesting model for studying the flora and vegetation evolution. The variety of landscapes, but also their differences, remain very remarkable, their distribution is conditioned by a large number of ecological factors. They are characterized by mixed groups of holm oak and Zeen oak in Hafir and Zarifet forests. Elsewhere, these are degraded groupings (Dahmani, 1997).
It is important to underline that the data relating to vegetation tend to bring the territories closer together, to highlight their affinities and subsequently to better understand their real phytosociological originality. Of course, this is linked to the fact that vegetation is the result of the integration of floristic, climatic, geological, historical, geographic, edaphic and anthropic factors.
We have tried through this note to synthesize interesting data available from the Tlemcen region: Hafir and the Moutas reserve.

Geographical location of the study site
The Tlemcen region is located in the western part of northwest Algeria (Fig. 1). The study area is located between 34°25'and 35°25' North and 0°55'and 2°30' West, with an area of approximately 9000 km 2 .
It is geographically limited: In the north by the Mediterranean sea, in the north-east by the wilaya of Aïn Témouchent, in the east by the wilaya of Sidi Bel-Abbès, to the west by the Algerian-Moroccan border, and in the south by the wilaya of Naâma.

The climate
The Tlemcen region is characterized by a Mediterranean type climate: (i) Short, cold mild winters run from October to March, characterized by irregular rainfall. (ii) Long hot and dry summers: marked by average rainfall and hot weather which ranges from 6 to 8 months.
In this region, two bioclimatic stages exist and dominate: the semi-arid and the sub-humid. The monthly and seasonal variations in main climatic characteristics (P and T) depending on the altitude and the distance from the sea, have been highlighted in Fig. 2. These variations show a comparison between the old meteorological data (1913( , 1938( -Seltzer, 1946 and the new data . There is a clear decrease in rainfall and an increase in temperatures (in most stations). These results agree with the hypothesis of climate change in the study stations which evolve towards a more marked aridity Benabadji, 2002, 2010;Babali et al., 2018). These climatic conditions directly influence the vegetation dynamics in a regressive direction (Bouazza and Benabadji, 2000).  (1913( -1938( : Seltzer, 1946; recent period (1975-2016) P: Rainfall (mm) and T: Temperatures (°C).

Methodology
One hundred surveys were carried out according to the conceptions of phytoecology and the floristic inventory based on the tree, shrub and herbaceous strata. The surveys were made on floristically homogeneous surfaces (Guinochet, 1973(Guinochet, , 1977. This important notion for the quality of information has been associated with that of minimum area (Gounot, 1969). The latter plays a role of first order, because it allows the floristic comparison of spatially dispersed surveys. It varies according to each plant group. In this regard, Djebaili (1984) pointed out that the flora richness depends essentially on the number of annual species present at the time of the survey. This, and consequently the minimum area, will also depend on the vagaries of annual and interannual rainfall. According to Gounot (1969), the commonly used method consists in listing the species on a plot with a very small surface area. Then double this surface (1 + 2) and add the new species that appear. By successive doublings, we are supposed to arrive at a surface (1 +2 +… + n) from which there are no longer (or practically no more) new species appearing. In reality, however, as we add new surfaces to the previous surface, there are always new species that appear more or less sporadically. In our case study, the floristic surveys, on a surface of 100 m² were carried out on the whole of the distribution area of the plant formations lay the favorable periods of the vegetation.
As Goodall (1952) noted, the method is not statistically correct, because if a species rare in the plant community was encountered in the initial plot, it will appear in all subsequent plots. Indeed, it would be more exact to operate on the series of plots of increasing size, taken at random in the community, without the small plots being systematically included in the large ones. This brings us to an average number of species included in the large ones. Each of our statements includes: the location of the statement, the list of species, the recovery rate, the altitude, the exposure, the slope, the substrate.
We have made a synthesis of two working methods that of the minimal area and the method of transect, this fusion allowed us to have relevant results at the level of the whole station. Outside of the study stations, we have adopted the floristic network; which consists in multiplying the surveys in order to get the maximum of information; this helps us to identify rare and endemic species and to complete the floristic list. This choice is motivated by the work speed (to save time) and by the flora richness.
To these alliances, present in the area, we should associate the Junipero oxycedri-Rhamnion developed in the Saharan Atlas and the southern slope of the Tlemcen mountains; and the alliance with Calycotome spinosa and Thymus munbyanus subsp. coloratus proposed by Gharzouli (1989) in eastern Algeria (association bearing Chamaerops humilis).
In Oranie, this alliance is replaced by its vicariant: Calycotomo intermediae-Quercion coccifera  which brings together the association of Calycotomo intermediae -Quercetum rotundifoliae. The Therophytes strong presence, because of the environment anthropization, results in the birth of an association defined by  and Quézel and Medail (2003): Ampelodesmo-mauritanicum-Chamaeropetum humilis which extends over the Tessala and Traras Mountains, and in some cases in the Tlemcen Mountains on the north-east slopes. We also meet it in eastern Morocco.
Within the Pistacio-Rhamnetalia alaterni; Hadjadj-Aoul (1995) described a new association: Ampelodesmo mauritanicum-Tetraclinetum articulatae which in turn contains a sub-association which reflects the pre-forest aspect derived from a green oak tree called Chamaeropetosum humilis at altitudes ranging from 700 to 1300 m.
The groups subservient to Calycotomo-Quercion would settle following the deterioration of the tetraclinaie, the cocciferaie or even the green oak of the upper thermo-Mediterranean and the lower meso-Mediterranean. If Calycotome intermedia and Ampelodesma mauritanicum characterize the order of Pistacio-Rhamnetalia alaterni in semi-arid bioclimate; they play a preponderant role in open environments, like the Calycotome in the class of Cisto-Lavanduletea in southern Europe.
However, as the Calycotome is a species very characteristic of relatively open shrubland and heavily degraded scrubland (Cherifi et al., 2011(Cherifi et al., , 2017, we would like to link it, as well as Chamaerops humilis subsp. argentea to the Rosmarinetea class. Also, it is absolutely excluded to be able to recognize these two species as characteristics of the Pistacio-Rhamnetalia alaterni. It is true, that with these two species, the sylvatic atmosphere reigns there in certain cases, but not to the point of excluding them from Rosmarinetea. Class of Rosmarinetea-Officinalis: (Braun-Blanquet 1947;Rivas Martinez et al., 1991) The intense degradation of the pre-forest groupings favors the installation of shrublands integrating into the classes of Rosmarinetea or Cisto-Lavanduletea according to the limestone or siliceous nature of the substrate. This class includes shrub associations and certain swards based on chamaephytes and therophytes. It is frequent all around the western basin of the Mediterranean. In Algeria, Djebaili (1990) links two orders to this class: (i) Rosmarinetalia (Braun-Blanquet, 1931 and) with a largely oro-mediterranean distribution. (ii) Thymoïsti-Juniperatalia phoeniceae (El Hamrouni, 1978), which is believed to be from the Maghreb. Two orders have been described in Morocco and taken up by Dahmani (1997): (i) Cisto mauritanici-thymetalia munbyani, (ii) Anarrhino fruticosi astragaletalia armati.
The differentiation that exists between the groups of the Anarrhino fruticosi-Astragaletalia armati and those of the Lygeo-stipetalia lies in their position in a steppe environment Benabadji, 2002, 2010).
The associations selected by Dahmani in 1984 and which are developing in the Tlemcen region (Hafir and the Moutas reserve) held our attention.
These associations include the following sets of vegetation: Helianthemo racemosi-Genistetum atlanticae: this grouping derives from the degradation of pine forests, green oak groves, with or without Kermes and Cedar oak (Quercus coccifera and Tetraclinis articulata): Beni Saf and the southern slope of the Tell and Western Atlas and Tlemcen region (Hafir and the Moutas reserve). These open formations allow the extension of Rosmarinus, Globularia, Stipa and Ampelodesma (Hasnaoui, 2008;Stambouli-Meziane, 2010 andBelhacini, 2015).
The various associations analysis allowed us to take stock of the high degree of degradation, either anthropogenic or ecological (erosion, fire, grazing, etc.), reflected by the penetration of numerous therophytes with a nitratophilic tendency. This class is not easy to read because of its interpenetration with other classes. It is characterized by its open and degraded appearance, something which led us to link all Chamaerops humilis subsp. argentea, Calycotome intermedia and several chamaephytes.
This class, well represented in Algeria (Kabylia), is poorly known in the Tlemcen region (Hafir and the Moutas reserve). This class is characterized by its open and degraded feature, something which led us to link to this class all the species which result from a degradation like Chamaerops humilis subsp. argentea and Calycotome intermedia, as well as several Chamaephytes and therophytes.
Our region is exposed to a significant degree of degradation, to such an extent that the palatable species disappear quickly and are replaced by others, toxic and thorny.

Tuberarietea guttatae class
This class brings together ephemeral xerophytic swards of Mediterranean origin characterized by the species that are frequently encountered in our study area; but few in number compared to Therobrachypodietea and, in the same ecological context, it is characterized by the rarity of palatable and non-dominant species: Scorpiurus muricatus, Atractylis concellata, Sideritis montana, Lagurus ovatus, Medicago minima, Evax pygmea, Arenaria scipillifolia, Hyppocrepis ciliata, Leontodon rothii and Trifolium stellatum.
The latter is characteristic of the Iberian Peninsula. However the order of Lygeo-stipetalia Braun-Blanquet and De Bolos (1957) which was always linked to the Therobrachypodietea was separated by Rivas-Martinez (1977) to attach it to the Lygeo-stipeteaclass.It seems to us preferable to keep the previous status, because it is well represented at the southern slopes in our area by perennial Poaceae (Bouazza et al., 2001 andBabali et al., 2013 It is important to note two other alliances: (i) Thero-Brachypodion Northwest of the Mediterranean (Braun-Blanquet, 1925) (ii) Stipion capensis North Africa and Spain (Braun-Blanquet, 1954) Nevertheless, it seems likely to us that the calcifuge therophytes, of Hafir and MoutasReserve, constitute units to be attached to the order of Tuberarietalia guttatae.
The three species of the Tlemcen region are marked by different frequencies and are present on both sides. Stipa parviflora is observed near Rosmarinus and Erica in the Beni-Saf region, to characterize a pre-forest formation.
In Algeria, and more particularly in the Oran Tell, Guinochet (1973) proposed the Atractylostipion alliance which was also reported in Tunisia by Chaabane (1993). The class of Tuberarietea guttatae was also adopted by Aime (1991) who, in his work, integrates it among the dry therophytic swards of the thermo-Mediterranean.The abundance of these swards in our study area testifies to the intense anthropozoogenic influence (Bouazza, 1991 andBabali, 2014). Two other classes, described by Dahmani (1997) in our area, and which are also linked to anthropozoogenic pressure, are: Thero-Brachypodietea guttatae and Stellarietea mediae.
The Thero-Brachypodietea class characteristics are numerous and the characteristic species are: Bromus rubens, Brachypodium distachyum, Aegilops triuncialis, Linum corymbiferum, Xeranthemum inapertum, Plantago albicans, Medicago rugosa, Ammoid verticillata, Convolvulus althaeoid, Bellisolifoli triquetrum, Pallenis spinosa, Echium vulgare, Malva aegyptiaca, Knautia arvensis and Convolvulus tricolor. The ecological range of these taxa is wide; they are encountered from the south of Sebdou to the Oran coastline, including the Hafir and the Moutas Reserve area, and undoubtedly constitute one of the groupings of the Meso and Thermo-Mediterranean stages.
Only one alliance derives from this set, that of the Thero-Brachypodion, with the following characteristics (present in Hafir and the reserve of Moutas): Micropus bombycinus, Paronychia argenatea, Galium mollugo, Salvia verbenaca, Scabiosa stellatum and Hippocrepis multisiliquosa. We have encountered these different species on various types of substrates. We take the example of Paronychia argentea found, and healthy, on limestone soil as on siliceous soil, accompanied by Scabiosa stellata and Trifolium stellatum.
Tuberarietalia guttatae (Rivas-Goday, 1957): the characteristic species are therophytic communities which prefer siliceous grounds, and develop on shallow and not very acid soils, with sandy or silty texture.
Apart from the Briza maxima species, which frequently occur in our surveys (north slope) and which is reported among the Tuberarion guttatae (Braun-Blanquet, 1931), the other species characterizing this order are absent. This alliance has two associations: Filago pyramidatae-Plantaginetum Iagopi (nov. Ass.) observed in open holm oak from the Tellian Atlas to the semi-arid and subhumid meso-Mediterranean (Traras mountains, Tlemcen region, Mascara, Tiaret, Ouarsenis, Bougaa and Babors). This association is either in the form of Ampelodesma mauritanicum fruit trees, hence the sub-association Ampelodesmetosum mauritanicum, or in the form of Calycotome and Quercus ilex suckers, or in the form of herbaceous swards.
The floristic complexity of the vegetation in the Tlemcen region appears to be the result of the anthropo-climatic effects which have occurred there over the past thirty years. The use, or even the overexploitation, by man and his herd, of this vegetation, largely contributed to the vegetal cover degradation.
However, it is in the most accessible areas (non-accidental relief, tracks, roads) that this process is particularly evident at present. The current plant landscape clearly reflects the heterogeneity of flora imbued with ecological conditions which are often extremely difficult. Preforest and shrubland groups, which are most often attached to the Pistacio-Rhamnetalia and Rosmarinetea, undoubtedly dominate. It is obvious that the sylvatic atmosphere still persists in the high altitude areas which should be attached to the Quercetea ilicis of which it has some of the characteristics. This situation is the consequence of the Mediterranean influence (North side) linked to hydric compensation in relation to an atmospheric humidityhigh rate, but also and above all, linked to orographic contributions. In the current bioclimatic context, the plant structures are distributed between two stages, which vary from the thermo-to the meso-Mediterranean.
The extent of the dry period imposes on the vegetation a strong evapotranspiration and on the landscape a vegetal cover rich in xerophyte species (Calyeotome, Asparagus, Ulex) favoring the fire. On this subject, and with regard to the northern limits, synthesis works have been carried out over the last decades; Aime (1991) on the Oran coast, Bouazza (1991Bouazza ( , 1995 and Bekkouche (2013) in the Tlemcen region; have shown the importance of changes in certain climatic parameters, and especially the rainfall, which generally led Barbero and Quézel (1995) to a drop in bioclimatic level (Emberger, 1955).
The progressive increase of the population and its livestock created a need and which could, duringsometime, cause an increase in the plant cover destruction leading imperatively to the constitution of ephemeral swards where dominate the toxic and/or not appetivethorny species such as: Centaurea, Calycotome spinosa, Urginea maritima, Ulex boivinii, Asphodelus microcarpus, Echium vulgare and Atractylis humilis.
The existence of annual species, most often in the form of a doormat, characterizes strongly anthropized shrublands (scrubland/scrub, Cherifi, 2013).
In addition to these shrublands, the Tuberrarieta guttatae and Stellarietea mediae species dominate the landscape. This is clearly understood when we see that the transhumance is done in an early manner from the South to the North and according to the places accessible to the herds (seasonal variations: HAPE for 1913-1938and then HPAE for 1975-2016. This tendency to seasonal shift in most of the study area has been well sensed by nomadic pastoralists, who are coming earlier in the summer pastures. In addition, on the southern slope, in contact with these shrublands, swards bring to gether the perennial xeric herbaceous associations which dominate, with rigorous vitality, and it is not on the vegetation of the northern slope that we can observe them. On the other hand, this interpretation is further justified by the fact that on the latter hygrophilic species exist but do not dominate, such as for example Lonicera implexa, Teucrium, Muscari neglectum and Orchis sp. (Moutas Reserve) and it is at this level that the species that characterize the Quercetum ilicis association crumble to give way to those linked to Pistacio-Rhamnetalia and Rosrnarinetea. What is sure is that the thermal requirements clearly explain the increasing continuity of the lentisk stands linked to the Pistacio-Rhamnetalia.
No doubt these stands should be reconsidered as a form of barrier to pure sylvigenesis linked to the Quercetea ilicis. It was a profound change in socio-economic conditions that brought man to this anarchic exploitation, hence the vegetation fire issue is posed in an increasing way.