Pollution study of Vembanadu lake and wetland rice ecosystem (Record no. 289745)
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| 000 -LEADER | |
|---|---|
| fixed length control field | 04363nam a22001817a 4500 |
| 082 ## - DEWEY DECIMAL CLASSIFICATION NUMBER | |
| Classification number | 631.4 |
| Item number | NAD/PO PG |
| 100 ## - MAIN ENTRY--PERSONAL NAME | |
| Personal name | Nadiya S A |
| 245 ## - TITLE STATEMENT | |
| Title | Pollution study of Vembanadu lake and wetland rice ecosystem |
| 260 ## - PUBLICATION, DISTRIBUTION, ETC. (IMPRINT) | |
| Place of publication, distribution, etc | Vellayani |
| Name of publisher, distributor, etc | Department of Soil Science and Agricultural Chemistry, College of Agriculture |
| Date of publication, distribution, etc | 2022 |
| 300 ## - PHYSICAL DESCRIPTION | |
| Extent | 139p. |
| 502 ## - DISSERTATION NOTE | |
| Dissertation note | MSc |
| 520 ## - SUMMARY, ETC. | |
| Abstract | The present investigation entitled ―Pollution study of Vembanadu lake and wetland rice ecosystem‖ was carried out at the College of Agriculture, Vellayani during the period 2019 to 2021 to assess the extent of pollution in Vembanad lake and wetland rice ecosystem. The lake is part of the Vembanad-Kol wetland system, which stretches from Alappuzha in the south to Azheekkode in the north, making it India's longest lake. The lake is fed by five rivers, including the Achenkovil, Manimala, Meenachil, Muvattupuzha and Pampa which are all prominent rivers in central Kerala. Samples of water and sediment from lake as well as soil and field water from paddy fields were collected during post monsoon and summer season. Samples collected from the two representative sites Kumarakom and Thanneermukkom were subjected to physical, chemical and biological analysis. Results of the analytical study of lake water revealed that among the physical properties, turbidity and colour were above the acceptable limit of BIS drinking water quality criteria and did not varied significantly with seasons. Chemical properties of water viz. pH, BOD, COD, NH4-N and Fe were also above the acceptable limit. pH, EC, K, Na, Ca and Mg varied significantly with season. Electrical conductivity and the cationic nutrients were found to be higher in summer than post monsoon season. Trace metals viz. Mn, Cu, Zn, Al, Pb and Cd were not detected in lake water samples in either of the seasons. Total bacteria and coliform count exceeded the acceptable limit of drinking water quality criteria in the study area. Pesticide residues were not detected in the lake water samples. Sample analysis of the sediment revealed that NO3- N recorded a mean value of 28.00 mg kg1 at Kumarakom and 36.17 mg kg1 at Thanneermukkom. Aluminium varied from 342.00-474.00 mg kg1 at Kumarakom while at Thanneermukkom was 348.00- 468.00 mg kg1 . For Pb, mean value of 0.71 mg kg1 and 0.72 mg kg1was obtained at Kumarakom and Thanneermukkom respectively. Seasonal variation was observed for the chemical properties viz. pH, EC, extractable K, Ca, Mg, S, and Mn. Parameters EC, cationic nutrients except Al, trace metals viz. Mn, Cu, Zn and Pb were found to be highest during summer season while pH, organic carbon, NO3- N, NH4-N, P, Al were highest during post monsoon. Cadmium was not detected in sediment samples collected in both the seasons. Pesticide residue analysis of sediment samples revealed the presence of DDT (0.024 mg kg1 ). Soil samples from padashekaram of Kumarakom were slightly acidic while it was moderately acidic at Thanneermukkom. At Kumarakom and Thanneermukkom organic carbon was high, available N and K were medium and low in available P. At both locations, secondary nutrients were sufficient. Among micronutrients, Fe toxicity and deficiency of Cu and Zn were observed. Chemical parameters of soil were significantly influenced by the seasons. Cationic nutrients and EC were high in summer while pH and organic carbon were high in post monsoon season. Pesticide residue analysis of the soil samples revealed the presence of cypermethrin, chlorpyrifos and ethion. Textural class of soil sample ranged from sandy loam to sandy clay loam. In the field water samples from padashekaram, trace element Fe was detected. Among the chemical properties pH, EC, S, K, Na, Ca, Mg varied significantly with season. Pollution study of Vembanad lake revealed that lake water is polluted with respect to most of the biological, physical and chemical properties. Hence it is important to develop water quality monitoring and management strategies for conserving and sustaining the natural resources from environmental pollution and ecological degradation. |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Soil Science and Agricultural Chemistry |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Pollution study |
| 650 ## - SUBJECT ADDED ENTRY--TOPICAL TERM | |
| Topical term or geographic name as entry element | Lake and wetland |
| 700 ## - ADDED ENTRY--PERSONAL NAME | |
| Personal name | Nadiya S A (Guide) |
| 942 ## - ADDED ENTRY ELEMENTS (KOHA) | |
| Source of classification or shelving scheme | |
| Item type | Theses |
| Not for loan | Collection code | Permanent location | Current location | Shelving location | Date acquired | Full call number | Barcode | Date last seen | Koha item type |
|---|---|---|---|---|---|---|---|---|---|
| Not For Loan | Thesis | KAU Central Library, Thrissur | KAU Central Library, Thrissur | Theses | 2022-07-21 | 631.4 NAD/PO PG | 175413 | 2022-07-21 | Theses |