Article

Surface Runoff as a Factor Determining Trophic State of Midforest Lake

Polish Journal of Environmental Studies (Impact Factor: 0.6). 12/2011; 20(5):1203-1210.

ABSTRACT It is generally claimed that surface runoff in forested catchments is minimal and therefore nutrient fluxes via runoff are unimportant. However, significant catchment slope inclination may promote overland water flow and, therefore, surface runoff might be responsible for transferring important nutrient loads to the lake. It was found that surface runoff waters within the catchment of Piaseczno Małe Lake have low pH (4.7-5.6), brown colour (max. 240 mgPt·dm-3), and high concentrations of dissolved organic carbon (max. ca 100 mgC·dm-3) – a major component of humic acids. Moreover, considerably high concentrations of biogenic substances were noted. Compared to beech-growing areas, surface runoff from pine forests contained higher concentrations of organic carbon, but lower concentrations of biogenic substances – differences were statistically significant. Similar tendencies were observed in the laboratory experiment. Moreover, the release of chemical substances from forest litter was found to be rapid. The most significant increase in nitrogen and phosphorus ions concentration and water colour and a decrease of pH were observed after the first hour of the experiment. Fluctuations of the colour and pH of the lake water (with the most intense brown colour and the lowest pH of the lake water observed in the periods of the highest rainfall and surface runoffs) indicate a significant role of surface runoff in the determination of the dystrophic condition of Piaseczno Małe Lake.

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Questions & Answers about this publication

  • Piotr Rzymski added an answer in Water Quality:
    Could people comment on concentrations versus loads when it comes to water quality in a waterbody?
    Here in the EU it's all concentration focused. Also what nutrient and forms are people interested in? E.g. DON appears little in literature but is very important.
    Piotr Rzymski · Poznan University of Medical Sciences
    What EU do you mean? Investigations in EU? Or European comission. Of course, estimating loads on nutrients is essential in understanding impacts the catchment areas have on surface water. In Poland there are few developed classifications of "susceptibility of lakes to degradation" which include , inter alia, evaluation of lakes morphometric features, use of catchment area etc.

    Check this by Bajkiewicz-Grabowska:
    http://link.springer.com/article/10.1007%2FBF00208211?LI=true

    Speaking of nutrients in surface water, nitrogen and phosphorus are the main one, of course including existing forms. It is important to estimate loads of N and P transported each year from agricultural catchment areas, in terms of developing sustained agriculture which does not degradate lakes. A boom for fertilizers is the mani eutrophication stimulator in Poland. Anyway, even if the catchment area is 100% natural, forested it still transport some loads of N, P and other. However, attached paper does not descirbe "loads" it at least points out that forests can be a soruce of humification of lakes via surface runoff, particularly in small, non throughflow lakes situated within coniferous forests.