Spatial variations and distributions of phosphorus and nitrogen in bottom sediments from a typical north-temperate lake, China

Distribution and Environmental Significance of Phosphorus Forms in Riparian Soils and River Sediments of Jianxi Basin, Fujian Province

“…It is visible that NaOH-P is the main form of IP in Jianxi sediment. This phenomenon is in agreement with the previous reports about most of lakes or rivers in southern China, but is different from Lake Dalinouer in northwestern China, whose HCl-P is the main form [37]. In alkaline soils, P will primarily bind to Ca; in weathered acidic soils, P will primarily bind to Al and Fe hydroxides [36].…”

“…A previous study shows that coarse particles are one of the sources of HCl-P, and the coarse particles are easy to deposit, leading to a positive correlation between particle size and HCl-P content [3]. Furthermore, high pH and Ca 2+ concentration in the water column could reduce the phosphorus adsorption by Fe(OOH) particles, and Ca 2+ in turn would tend to form Ca 5 (PO4) 3 OH precipitate with orthophosphate [37]. Therefore, HCl-P in Songxi catchment increases obviously.…”

“…It can be easily desorbed form sediments and released into the overlying water when environmental conditions change, and has a close relationship with water quality and the type of water ecosystem [37].…”

Nitrogen distribution and ammonia release from the overlying water and sediments of Poyang Lake, China

“…Eutrophication originating from excessive nutrient loading is a serious environmental problem which leads to the degradation of lake and reservoir ecosystems (Cao et al 2011;Muhid et al 2013;Hou et al 2014). Eutrophication is often caused by a disturbance in nutrient and algae dynamics driven by external nutrient loading and internal recycling (Havens et al 2001;Ye et al 2014).…”

Thematic issue: water of the Erhai and Dianchi Lakes

“…It has a surface of 298 km 2 at 1886 above sea level. The lake extends 39 km long from north to south with a width of 13.5 km and has an average depth of 4.4 m. Lake Dianchi is the eighth largest lake in China, it is also denoted as the lake of Kunming, the capitol of the Yunnan province (Lu et al 2013;Hou et al 2014). Located in the lower reach of the cities and at the bottom of the valley, Dianchi Lake is situated in an area which is characterized with developed local economy, dense population, high Lake Erhai Lake Dianchi level of urbanization and severe water shortage.…”