PJB-2017-623
DESCRIPTION OF COMMUNITY TYPES FROM DIFFERENT HABITATS AROUND KARACHI
FARIHA NAZ
Abstract
Phytosociological sampling was conducted in six different habitats around Karachi using quadrat method. On the basis of floristic composition and dominant species, 17 community types were recognized. Maximum water holding capacity, organic matters, CaCO3, pH, TDS, salinity and conductivity of soils belong to each stand were determined. Each habitat show different values of water holding capacity, salinity and CaCO3. Highest (44%) amount of water holding capacity, organic matter (9%) and salinity (8.23ppm) was recorded from Tidal zone with gradual decrease in saline waterlogged area, alluvial plain to rocky plain. Highest amount of CaCO3 was recorded from rocky area. It is shown that alluvial plain to dry stream similar floristic composition i.e. Euphorbia caducifolia- Commiphora wightii- Prosopis juliflora, with Capparis decidua, Ziziphus nummularia were recorded in many sites. Once widely distributed climatic climax species Prosopis cineraria was recorded in a few places with low Importance value. It is concluded that due to anthropogenic disturbances and aggressive growth of Prosopis juliflora, natural vegetation has altered considerably.
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