http://www.physorg.com/ en-us Physorg.com internet news portal provides the latest news on science including: Physics, Nanotechnology, Life Sciences, Space Science, Earth Science, Environment, Health and Medicine. Nutrients transported from catchments are one of the most important sources for lake eutrophication. The Honghu Lake Basin, located at the middle reaches of the Yangtze River, was chosen as the study area, the numerical simulations were used to assess the relative roles of natural, climate-induced changes versus human-related activities in changes of the nutrient transportation. The simulation results showed that the effect from human activities increased rapidly, and had become a dominant factor. http://www.physorg.com/news138435775.html Space & Earth Wed, 20 Aug 2008 07:22:55 EST news138435775