Publications by authors named "Zhao-Kui Ni"
Article Synopsis
- * Results indicated that both DOP and SRP followed similar release patterns characterized by an initial rapid release phase that slows down over time, influenced by the types of organic phosphorus present in the sediments.
- * The findings showed that DOP poses a higher water quality risk than SRP, with DOP accounting for a significant portion (47%-77%) of total organic phosphorus released, especially in nutrient-rich lakes, suggesting that both forms of phosphorus release need closer monitoring to prevent environmental issues.
Spatial and temporal characteristics of release fluxes of sediment nitrogen (N) and phosphorus (P) were investigated in the high-risk period of algal blooms in Lake Erhai. Moreover, the influence factors were examined. Results show that the release flux of N and P increased in recent years, exhibiting a clear increase in the period from 2009 to 2013, and a slight increase in the period since 2013.
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- The study analyzes water quality data for Poyang Lake from 1996 to 2016, revealing trends in inflow and outflow and identifying key influencing factors.
- Total nitrogen (TN) and total phosphorus (TP) were major contributors to water quality decline, particularly from 2004 to 2011 due to increased nutrient loads in the surrounding watershed.
- By examining the spatial variations, it was found that the southern and eastern areas of the lake had significantly higher TN and TP levels, mainly due to contributions from nearby rivers, highlighting the impact of nutrient loading over hydrological changes on the lake's water quality.
In this work, the effects of four covering materials on the release of total dissolved phosphorus (DTP), dissolved organic phosphorus (DOP), and soluble reactive P (SRP) in different sediments of Erhai Lake were simulated. The results showed that the max release of DTP was reduced in covering material, which attributed to the changes of pH, Eh and characteristics of dissolved organic matter (DOM) by the effect of covering material. The application of iron oxide material significant reduced the release of DTP in the northern and southern part of the lake, with decrease rate of 44.
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- The study examined how changes in water levels at Poyang Lake affect nitrogen amounts and forms in the sediment, focusing on how the river-lake relationship influences nitrogen release risks.
- Total nitrogen (TN) levels ranged from 389 to 3865 mg/kg, showing a declining trend in certain areas, with transferable nitrogen (TTN) contributing 52% to TN levels.
- Seasonal changes impacted nitrogen content, with higher nitrogen levels found in sediments at greater elevations during dry periods due to prolonged exposure of sediments.
Effects of river (Yangtze River)-lake (Poyang Lake) relation on the distribution and potential ecological risk of Cu, Pb, Zn, Cr and Cd were investigated in surface sediment of Poyang Lake under different waterregimens. The results indicated: (1) the sediments of Poyang Lake were polluted by various concentrations of heavy metals mainly originated from particulates of Yangtze River, and Cu and Pb were the main pollution factors. The pollution level of determined heavy metals followed the order of Cu > Pb > Zn > Cr >Cd.
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