The nutrient status of Nong Han, a shallow tropical lake in north-eastern Thailand: spatial and temporal variations

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dc.contributor.author Settacharnwit, Surattana en_US
dc.contributor.author Buckney, Rodney en_US
dc.contributor.author Lim, Richard en_US
dc.date.accessioned 2009-12-21T02:29:25Z
dc.date.available 2009-12-21T02:29:25Z
dc.date.issued 2003 en_US
dc.identifier 2003001538 en_US
dc.identifier.citation Settacharnwit Surattana, Buckney Rodney, and Lim Richard 2003, 'The nutrient status of Nong Han, a shallow tropical lake in north-eastern Thailand: spatial and temporal variations', Blackwell Synergy, vol. 8, pp. 189-200. en_US
dc.identifier.issn 1440-1770 en_US
dc.identifier.other C1 en_US
dc.identifier.uri http://hdl.handle.net/10453/3612
dc.publisher Blackwell Synergy en_US
dc.relation.isbasedon http://dx.doi.org/10.1111/j.1440-1770.2003.00221.x en_US
dc.title The nutrient status of Nong Han, a shallow tropical lake in north-eastern Thailand: spatial and temporal variations en_US
dc.parent Lakes & Reservoirs: Research and Management en_US
dc.journal.volume 8 en_US
dc.journal.number en_US
dc.publocation Carlton, Australia en_US
dc.identifier.startpage 189 en_US
dc.identifier.endpage 200 en_US
dc.cauo.name Dept of Environmental Biology en_US
dc.conference Verified OK en_US
dc.for 039900 en_US
dc.personcode 00092825 en_US
dc.personcode 800142 en_US
dc.personcode 870336 en_US
dc.percentage 100 en_US
dc.classification.name Other Chemical Sciences en_US
dc.classification.type FOR-08 en_US
dc.description.keywords Nong Han, nutrients, spatial variations, temporal variations, tropical lake. Spatial and temporal patterns of nutrient (nitrate N, ammonia-N and phophate) concentrations in the Nong Han water column were examined during the dry (January - May) and wet (August - October) seasons in 2001. Low nitrate-N concentrations in the water were common. High ammonia-N concentrations were found on all occasions, but particularly in the early wet season. Phosphate concentrations in the water column were very high. The very low nitrate-N and low ammonia-N concentrations (in early dry, late dry and late wet seasons) and low phosphate concentrations (in the early dry season) were attributed to assimilation by dnse stands of macrophytes, in particular submerged types during the low water season. Additionally, higher nitrate-N concentration dound in the late wet season might be related to increases in the water levels and nitrification activity at the sediment-water interface. The very high ammonia-N and phosphate concentrations int he water during the early wet season possibly reflect run-off from agricultural areas in the Nong Han catchment and the regeneration of ammonia-N and phosphate from recently degraded organic matter (particularly decaying macrophytes) in the surface sediment layer. Also, higher phosphate concentration in the bottom water of most samples in the late dry and late wet seasons were attributed to temporary anaerobic conditions caused by submerged macrophyte decomposition and aerobic conditions, respectively. These hypotheses are consistent with dissolved oxygen and pH conditions found in both seasons. en_US
dc.staffid 870336 en_US


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