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| Content Provider | World Health Organization (WHO)-Global Index Medicus |
|---|---|
| Author | Routh, Joyanto Chakrapani, Govind J. Choudhary, Preetam |
| Spatial Coverage | India |
| Description | Country affiliation: India Author Affiliation: Choudhary P ( Department of Earth Sciences, Indian Institute of Technology Roorkee, Roorkee 247667, India.) |
| Abstract | Sattal a small mountainous lake in the Kumaun Himalayas has been impacted by various cultural activities in recent years. We explored the effects of human-induced changes in this lake by using various geochemical proxies. Shifts in TOC and N flux, C/N ratio, stable isotopes (delta13C and delta(15)N), n-alkane, and pigment concentrations in sediments indicate a steady increase in primary productivity over the last few decades. The trophic status of the lake has changed from mesotrophic to eutrophic condition. The C/N, CPI, and TAR based ratios in sediments indicate accumulation of algal matter derived primarily from in situ production, with limited input of terrestrial organic matter from the watershed. The low (between 0.1 and 1 per thousand) delta15N values imply N2-fixation by cyanobacteria, and the decrease in delta13C values up-core represent the effect of sewage input and land based runoff, or possible contribution from microbial biomass. The pigments change from non-N2 fixing cyanobacterial species to the N2-fixing community, and are consistent with the proxy-based productivity shifts inferred in the lake. The deeper sediments are affected by post-diagenetic changes causing an increase in delta13C (and possibly delta15N) due to mineralization of organic C and N. |
| ISSN | 00489697 |
| Issue Number | 8 |
| Volume Number | 407 |
| e-ISSN | 18791026 |
| Journal | Science of The Total Environment |
| Language | English |
| Publisher | Elsevier |
| Publisher Date | 2009-04-01 |
| Publisher Place | Netherlands |
| Access Restriction | One Nation One Subscription (ONOS) |
| Subject Keyword | Geologic Sediments Chemistry Biological Markers Analysis Carbon Cyanobacteria Metabolism Eukaryota Growth & Development India Lead Radioisotopes Nitrogen Nitrogen Fixation Oxygen Pigments, Biological Journal Article Research Support, Non-u.s. Gov't Discipline Environmental Science |
| Content Type | Text |
| Resource Type | Article |
| Subject | Environmental Chemistry Waste Management and Disposal Pollution Environmental Engineering |
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