Dominant species identified were Cannabis sativa, Oxalis corniculata, Cynodon dactylon and Digitaria setigera. Cannabis sativa, the most frequently occurring specie of study area, is a wild herb and grows in moist and waste places near houses and along roadsides. It is common weed found throughout of Pakistan (Abbasi et al., 2011). As far as second most dominant species Oxalis corniculata is concerned, it is found in temperate areas having moisture and sunlight like waste places, cultivated lands in loamy soil, gardens, yards, driveways and sidewalk cracks (Abbasi et al., 2011; Eiten, 1955). Another prevalent species, Cynodon dactylon is commonly found in warm and temperate climates of world (Kole, 2011). Natural population are highly tolerant toward soil salinity (Pessarakli, 2007). Cynodon dactylon appeared as most dominant specie with RF of 47.5% followed by Cannabis sativa with RF of 17.9% in Islamabad as stated
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In case of evenness index J´ of species, highest value of 1 was found in sample 8 that have similar relative abundance of species or equal number of individuals belong to each species while species evenness was 0 in samples that also have 0 value of Shannon index that indicates less species diversity result in only one or few species dominate. Remaining samples have moderately high species evenness (Figure 1 (c)).
As far as Simpson index of diversity is concerned, minimum value was 0 while maximum value was 0.77. This index value range between 0 and 1, the greater value correspond to large sample diversity. It indicates the probability that two individuals which are randomly selected from sample belong to different species. Thus those samples which have large values had greater diversity of species as compared to other
In case of evenness index J´ of species, highest value of 1 was found in sample 8 that have similar relative abundance of species or equal number of individuals belong to each species while species evenness was 0 in samples that also have 0 value of Shannon index that indicates less species diversity result in only one or few species dominate. Remaining samples have moderately high species evenness (Figure 1 (c)).
As far as Simpson index of diversity is concerned, minimum value was 0 while maximum value was 0.77. This index value range between 0 and 1, the greater value correspond to large sample diversity. It indicates the probability that two individuals which are randomly selected from sample belong to different species. Thus those samples which have large values had greater diversity of species as compared to other