Occurrence, source identification and ecological risk assessment of heavy metals in water and sediments of Uchalli lake - Ramsar site, Pakistan.

Uchalli Lake is an internationally significant Ramsar site that needs protection for supporting migratory birds. The current study aimed to assess wetland health by examining water and sediments utilizing total and labile heavy metals concentration, pollution indices, ecological risk assessment, water recharge and pollution induction sources through isotope tracer techniques. Al concentration in water was of serious concern as it was 440 times higher than the maximum acceptable concentration of Environmental Quality Standard of the UK for aquatic life in saline waters. Labile concentration predicted very severe enrichment of Cd, Pb, and moderate enrichment of Cu. Modified ecological risk index predicted very high ecological risk in sediments. The δ 18O, δ2H and D-excess values indicate that the lake was mainly recharged by local meteoric water. Enriched values of δ 18O and δ2H suggest a high evaporation of lake water, making lake sediments more enriched with metals. Isotopic and D-excess values of groundwater suggest a quick rainwater recharge to groundwater around the Uchalli Lake. Nitrates isotopes indicate that the rainwater runoff is main source of induction of fertilizers, pesticides and soil bonded metals in the lake system. The lake is recharged by rainwater runoff, from catchment areas, that erode the soil particles and agricultural residual waste dumped in the lake.

Indigenous knowledge of medicinal plants in Kotli Sattian, Rawalpindi district, Pakistan.

AIM OF STUDY: The present study aimed to report the ethnomedicinal information from Kotli Sattian, district Rawalpindi for detailed medicinal uses and to inform the community about conservation of medicinal plant diversity and ethnomedicinal knowledge of plants. MATERIAL AND METHODS: Ethnomedicinal data were collected via Rapid Appraisal Approach (RAA) along with interview, group meetings with local people having awareness about medicinal knowledge of plants and individual meetings with local healers. RESULTS AND DISCUSSIONS: This study reported eighty seven (87) indigenous medicinal plants, distributed among fifty five (55) families and seventy nine (79) genera. Among these, herbs contributed 43%, trees 28%, shrubs 21% and climbing plants 8%. About 34% of herbal preparations were made from whole plants followed by the leaves (27%), fruits (08%), bark (06%), seeds (05%), root (05%), rhizome (04%), stem, flower, gum, pod and tubers (02%) and milky latex (01%). Justicia adhatoda showed the maximum use value (0.91) while Cuscuta reflexa showed the least use value (0.11). CONCLUSION: Elder people in the study area still rely on herbal remedies although the modern heath care facilities are present in the study area; thus, the indigenous plants remain important medicines in solving health problems.