Evaluation of trophic status and its limiting factors in the Renuka Lake of Lesser Himalaya, India
Autor: | Pawan Kumar, Narendra K. Meena, A. K. Mahajan |
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Rok vydání: | 2018 |
Předmět: |
Limiting factor
Hydrology 010504 meteorology & atmospheric sciences Phosphorus chemistry.chemical_element India General Medicine 010501 environmental sciences Management Monitoring Policy and Law Eutrophication 01 natural sciences Pollution Salinity Lakes Nutrient Productivity (ecology) chemistry Water Quality Microalgae Environmental science Trophic state index Surface water 0105 earth and related environmental sciences General Environmental Science Trophic level |
Zdroj: | Environmental monitoring and assessment. 191(2) |
ISSN: | 1573-2959 |
Popis: | The present study is to evaluate trophic status and its limiting factors in the Renuka Lake, using surface water samples. The water of the lake is found to be slightly alkaline with pH 8.33–8.70 (avg. 8.61 ± 0.1). The turbidity 4.63–6.62 NTU (avg. 5.48 ± 0.63 NTU) indicated low level of clarity in the lake. The Carlson’s index based on the Secchi disc transparency (SD), chlorophyll-a (Chl-a), and total phosphorus (TP) has indicated that the Renuka Lake is turned hyper-eutrophic in status. The correlation coefficient has indicated that most parameters in the lake are contributed by different sources. Factor-1 marked 26.40% variance, which may be due to higher impact of rock weathering than the anthropogenic activities, whereas 18.56% variance shown by factor-2 may be due to natural and anthropogenic activities. However, factor-3 (14.38% variance) inferred that the higher contribution of Chl-a, pH, TDS, NH4+, NO3−, salinity, and SO42− is due to major impacts of the anthropogenic activities. The inverse distance weighting method has indicated spatial interpolation and area of influence of different parameters in the lake. The “nutrient (TP) limited large sized algae” as well as phosphorus is considered as a major limiting factor for increasing productivity and trophic state index. The present study has inferred that the nutrient enrichment should be controlled to restore the Renuka Lake, owing to its social and ecological significances. |
Databáze: | OpenAIRE |
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