B. Papp szerk.: Studia Botanica Hungarica 29. 1998 (Budapest, 1999)
Iqbal, M. Z., Sherwani, A. K.; Shafiq, M.: Vegetation characteristics and trace metals (Cu, Zn and Pb) in soils along the super highways near Karachi, Pakistan
Table 1 (continued) Concentration (jig g ') Stand First Dominant IVI Other Dominants IVI Cu Zn Pb 15 P. juliflora 41.65 S. holosericea Capparis decidua (Forsk.) Edgew 24.87 17.86 30 36 13 16 P. juliflora 39.72 Salsola baryosma (R. B. S.) Dandy S. holosericea 26.41 19.00 330 268 48 17 P. juliflora 35.57 S. holosericea A.javanica 26.12 20.56 110 200 45 18 A but Hon indicuin (L.) Sweet 35.24 S. holosericea P. juliflora 32.57 25.20 120 105 23 19 Fagonia indica 34.89 S. holosericea P. juliflora 33.26 26.94 135 100 25 20 Blepharis sindica Stocks ex T. Anders 27.52 C. decidua Haloxylon recurvum (Moq.) Bunge 22.65 17.77 305 35 15 Soil analysis of the stands showed that the average Zn and Pb concentrations in stands in which P. juliflora was the most dominant species was 112.4 and 31.3 u.g g~ , respectively (Table 2). The average concentration of Cu was comparatively lower (134.0 p.g~ ) in P. juliflora dominant stands than S. holosericea, which showed the average concentration of Cu in stands to about 189.5 \ig g _1 . The stands in which A. indie um, F. indica and B. sindica were present showed comparatively less Zn and Pb concentration than P. juliflora stands. Cu concentration on the other hand was greater in F. indica and B. sindica stands than the average level of Cu in P. juliflora stands. Whereas, the reverse was the case for S. holosericea stands. The B. sindica stand showed the highest concentration of — l —l —1 Cu (305 p.g g ) and the lowest of Zn (35 |4g g ) and Pb (15 u.g g ) as compared to any other stands analyzed. Some of the species which were rare have been shown in Table 3. Their importance value was not more than 16.0%. Salvia santolinifolia was found in four stands, while Aerva javanica and Calotropis procera were recorded in 3 stands. At these stands, the levels of Cu, Zn and Pb in soils were not high. In one stand, where Suaeda fmucosa was the least dominant species, the levels of Cu, Zn and
