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130 ◆ Y. M. AL-SODANY, M. N. SHEHATA & K. H. SHALTOUT Community variables Fine fraction Moisture content Soil variables EC pH Cl SO 4 Na K Ca Mg Total species 0.38 0.18 0.04 0.15 0.71* -0.53 0.67* 0.47 -0.54 0.80 Species richness 0.50 0.35 0.19 0.32 -0.65* -0.42 -0.46 0.73* -0.48 0.36 Species turnover -0.36 -0.37 -0.36 -0.70* 0.33 0.64* -0.14 -0.65* 0.23 -0.36 Relative conc. of dominance (C) -0.46 -0.26 -0.32 -0.47 0.19 0.96*** 0.11 -0.29 0.15 0.15 Relative evenness (H’) 0.46 0.23 0.18 0.32 -0.47 -0.82** -0.40 0.38 -0.38 0.12 Table 5. Matrix of simple linear correlation coefficients between the soil and community variables of the Al-Jabal Al-Akhdar area. Significant r values are indicated as follows: * P ≤ 0.05, ** P ≤ 0.01, *** P ≤ 0.001. Table 3. Variation in some diversity indices calculated for the 6 vegetation group and the 10 types of habitat identified in Al-Jabal Al-Akhdar area. The vegetation groups are: I: Juniperus phoenicea – Sarcopoterium spinosum, II: Crucianella maritima – Suaeda vermiculata, III: Retama raetam, IV: Pancratium maritimum – Ammophila arenaria, V: Cichorium spinosum, VI: Limoniastrum monopetalum. The habitats of coastal plain are: SS: saline sand flats, SD: coastal sand dunes and SF: sand flats; those of coastal hill are SW: seaward slope and LW: leeward slope; those of plateau are FT: first terrace and ST: second terrace; and those of wadis. are SE: south-east slope, NE: north-east slope, and WB: wadi bed. Component Total species Species richness Species turnover Relative conc. of dominance (C) Relative evenness (H’) Vegetation group I 113 22.3 5.1 0.01 2.25 II 17 7.8 2.2 0.08 1.174 III 16 5.3 3.0 0.09 1.13 IV 14 5.0 2.8 0.13 1.00 V 11 5.4 2.0 0.11 0.99 VI 11 5.7 1.9 0.11 0.99 Total mean 30.3 8.6 2.8 0.09 1.25 S. D. 40.6 6.8 Habitat 1.2 0.04 0.49 Coastal plain Coastal hill Plateau The calculation of simple linear correlation coefficients between the soil and community variables (table 5) indicated that sulphate had highly positive correlations with relative concentration of dominance (r = 0.96, p < 0.001), and negative correlation with relative evenness (r = -0.82, p < 0.01). The correlation between the elevation SS 13 5.3 1.9 0.12 0.99 SD 6 2.4 4.2 0.36 0.52 FP 20 6.1 2.5 0.07 1.23 SW 18 7.1 1.4 0.12 1.04 LW 67 21.2 0.7 0.04 1.52 FT 91 49.1 0.3 0.05 1.51 ST 91 53.7 0.5 0.05 1.69 SE 80 21.7 3.7 0.06 1.50 Wadi NE 52 27.8 0.5 0.07 1.36 WB 52 27.9 0.5 0.08 1.34 Total mean 49 22.2 1.6 0.10 1.27 S. D. 33.0 18.1 1.4 0.09 0.34 and species diversity indicated significant positive correlation with total number of species (r = 0.84, p < 0.01), relative evenness (r = 0.71, p < 0.05) and species richness (r = 0.90, p < 0.001) (fig. 3A). On the other hand, the correlation between the elevation and plant cover indicated a significant positive correlation with the total cover ecologia mediterranea, tome 29, fascicule 2, 2003
ecologia mediterranea, tome 29, fascicule 2, 2003, p. 125-138 VEGETATION ALONG AN ELEVATION GRADIENT IN AL-JABAL AL-AKHDAR, LYBIA ◆ Fig. 3. Simple linear regression between the elevation and species diversity of the vegetation (A) and simple linear regression between the elevation and the total cover and cover of some species (B) of the study area in Al-Jabal Al-Akhdar. 131
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218 ◆ M. BARBERO INTRODUCTION Une
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220 ◆ M. BARBERO frutescens, Pote
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224 ◆ M. BARBERO La dégradation
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226 ◆ M. BARBERO ticum, Hepatica
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240 ◆ M. BARBERO Bibliographie Ce
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242 ◆ M. BARBERO CAILLIAU A., 200
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244 ◆ M. BARBERO terranéen dans
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262 ◆ ANALYSES D’OUVRAGES paysa
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264 ◆ ANALYSES D’OUVRAGES tradi
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