The ratio of nitrogen to phosphorus in the sediments indicates that the lake is in the state of eutrophication, and the organic roots possibly in the hydrophytes.
沉积物中氮磷比值表明湖水处于富营养化状态，有机物主要来源于水生植物。
2
If nitrogen and phosphorus get to certain ratio in water, may cause the water eutrophication, then will lead to algae bloom outbreaks.
水体富营养化条件是氮磷达到适合的比例，才会导致水华的爆发。
3
The effects of the return sludge ratio and the return mixed liquid ratio on the removal of nitrogen and phosphorus were studied in the modified A2/O process.