School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
School of Environmental Science and Engineering, Tianjin University, Tianjin, 300072, China.
Chemosphere. 2018 Nov;210:1070-1081. doi: 10.1016/j.chemosphere.2018.07.108. Epub 2018 Jul 23.
Being able to quantify nutrient stoichiometry in the waterbodies is especially important given its strong effects on a variety of ecological processes. China has made huge progress in the improvement of surface water quality, but the accompanying changes to water nutrient stoichiometry and implications are not well understood yet. Our results have shown that the water nutrient cycles have been decoupled in China's populated regions, and population density and GDP values in the same catchment are useful in explaining the variances of lake N:P stoichiometry in East China Lake Region. In other regions, water N and P tend to respond to the selected parameters in a similar way, leading to the poor prediction of N:P stoichiometry. With the progress of water management in China, a similar change of water nutrients and their stoichiometry as the developed countries is occurring, i.e., faster decrease of TP concentrations than TN, and continuing increase of N:P ratios. It is necessary for the managers to be aware of the quick and large-scale changes of nutrient stoichiometry in the water, since the ecological risk caused by the changes to the aquatic systems is still not well known.
鉴于营养化学计量在各种生态过程中具有重要影响，因此能够量化水体中的营养化学计量尤其重要。中国在改善地表水水质方面取得了巨大进展，但伴随而来的水营养化学计量的变化及其影响还没有得到很好的理解。我们的研究结果表明，中国人口密集地区的水营养循环已经脱钩，同一流域的人口密度和 GDP 值可以很好地解释华东湖区湖泊 N:P 化学计量的差异。在其他地区，水 N 和 P 往往以类似的方式对所选参数做出响应，从而导致对 N:P 化学计量的预测不佳。随着中国水管理的进步，中国正在经历与发达国家类似的水营养及其化学计量的变化，即 TP 浓度的下降速度快于 TN，N:P 比值持续增加。管理者有必要意识到水中营养化学计量的快速和大规模变化，因为水生系统的变化所带来的生态风险还不为人知。
