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Impact of human interventions on nutrient biogeochemistry in the Pamba River, Kerala, India
- Source :
- Science of The Total Environment. 541:1420-1430
- Publication Year :
- 2016
- Publisher :
- Elsevier BV, 2016.
-
Abstract
- Anthropogenic inputs nowadays are the major source of nutrients to the coastal area. While a wealth of data exists from high latitude regions, little is known on the amount and composition of nutrient fluxes from densely populated tropical catchments. The South Indian Pamba River is a prime example in this respect because of its manifold human interventions such as the Sabarimala pilgrimage, the largest pilgrim centre in the world and agricultural practices. In order (i) to identify direct cause-effect relationships, (ii) to quantify land use specific nutrient inputs and (iii) to assess the respective impacts water was sampled along the river course during the pre monsoon, south west monsoon and north east monsoon periods in 2010 to 2012. Sampling segments were chosen according to prevailing land use. A socioeconomic survey on agricultural practices was conducted to collect information on the type, time and quantity of fertilizer application. Our results indicate (i) little human activities in the forest segment resulted in a low nutrient yield; (ii) pilgrim activities led to high ammonium and phosphate yields in the temple segment; (iii) specific fertilizer management resulted in moderate and maximum nitrate yields in the respective agriculture segments. Annual NPK fertilizer inputs to the catchment were 95 kg ha(-1) yr(-1).The average yield for the Pamba River catchment amounted to 3.5 kg ha(-1) yr(-1) of DIN and 0.2 kg ha(-1) yr(-1) of phosphate-P. As opposing predictions for densely-populated regions the N and P yields of the Pamba River are moderate to low on a global scale. It highlights the need for land use specific quantitative estimates from tropical regions in order to improve the global database and local water quality management.
- Subjects :
- Conservation of Natural Resources
Environmental Engineering
010504 meteorology & atmospheric sciences
Drainage basin
India
010501 environmental sciences
engineering.material
Monsoon
01 natural sciences
Nutrient
Rivers
Environmental Chemistry
Fertilizers
Nitrogen Compounds
Waste Management and Disposal
0105 earth and related environmental sciences
Hydrology
geography
geography.geographical_feature_category
Land use
business.industry
Tropics
Biogeochemistry
Agriculture
Phosphorus
Pollution
engineering
Environmental science
Fertilizer
business
Water Pollutants, Chemical
Environmental Monitoring
Subjects
Details
- ISSN :
- 00489697
- Volume :
- 541
- Database :
- OpenAIRE
- Journal :
- Science of The Total Environment
- Accession number :
- edsair.doi.dedup.....b162f130cc94760814eb209f23debda3