AI Article Synopsis
- Lake Wuliangsuhai, a key freshwater lake in China's grassland areas, is facing significant issues with shrinking size and increasing eutrophication.
- The study found that total nitrogen levels in the lake's sediment varied significantly based on location and were closely linked to the amount of organic matter present.
- The sediment analysis indicated that organic matter primarily comes from lake vegetation, and the internal nutrient load is a major factor driving eutrophication, with smaller sediment particles showing much higher concentrations of nitrogen and organic matter compared to larger particles.
Article Abstract
Lake Wuliangsuhai is one of the representative inland freshwater lakes in grassland areas of China, and its shrinking and eutrophication is becoming more serious. The study on the ecological and environmental effects of the shrinking and eutrophication revealed that the total nitrogen (TN) content in the surface sediment of the lake had an obvious differentiation both in longitudinal and in latitudinal direction, and had a significant correlation with organic matter content. The mean C/N ratio of the sediment ranged from 12.07 to 19.95, which meant that the organic matter was mainly come from the hydrophytes of the lake, and the eutrophication of the lake was mostly caused by its internal load. Both TN and organic matter had a clear grain-size effect in different fractions of grain sizes of surface sediment, and their contents in IV (< 63 microm) were as 3.1 - 7.6 and 2.5 - 8.0 times as those in I (>250 microm), respectively.
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