澳洲南澳论文代写:氮磷化合物
Keywords:澳洲南澳论文代写
水体中氮磷化合物比例是决定限制因子的重要因素，是控制机制的一个重要因素。（表1）。磷是淡水浮游植物的主要限制因子。对于大型海洋地区，经常有氮作为限制性营养物质，特别是在夏季。在春季，如河流羽状物等中等区域常受磷的限制，但在夏季可能会变成二氧化硅或氮的限制。这种现象几乎发生在世界各地。有人为养分输入的三个主要来源：径流、侵蚀和施肥的农业区的浸出，和城市生活污水和工业废水。大气中氮的沉积（来自动物繁殖和燃烧气体）也很重要。据欧洲环境署说，“氮污染物的主要来源是从农田中流失，而磷污染主要来自家庭和工业，包括含磷洗涤剂。二十世纪工业生产和内部消费的快速增长导致了大量富含养分的废水。虽然最近在农业实践中对氮和磷有更好的管理，但在某些地区出现了过量的粪肥，这可能会引起土壤磷的饱和。澳洲南澳论文代写:氮磷化合物污水处理厂的养分去除和无磷洗涤剂的推广对减少氮磷污染对欧洲水体的影响至关重要。
澳洲南澳论文代写:氮磷化合物
The sufficient factor to determine limiting factor is the ratio of nitrogen to phosphorus compounds in the water body is an important factor for control mechanism. (Table 1). Phosphorus is generally limiting factor for phytoplankton in fresh waters. For large marine areas frequently have nitrogen as the limiting nutrient, especially in summer. Intermediate areas such as river plumes are often phosphorus-limited during spring,but may turn to silica or nitrogen limitation in summer.The enrichment of water by nutrients can be of natural origin but it is often dramatically increased by human activities. This occurs almost everywhere in the world. There are three main sources of anthropic nutrient input: runoff, erosion and leaching from fertilized agricultural areas, and sewage from cities and industrial wastewater. Atmospheric deposition of nitrogen (from animal breeding and combustion gases) can also be important. According to the European Environment Agency, "the main source of nitrogen pollutants is run-off from agricultural land, whereas most phosphorus pollution comes from households and industry, including phosphorus- based detergents. The rapid increase in industrial production and in in-house consumption during the 20th century has resulted in greater volumes of nutrient-rich wastewater. Although there has been recently a better management of nitrogen and phosphorus in agricultural practices, saturation of soils with phosphorus can be noted in some areas where spreading of excessive manure from animal husbandry occurs. Nutrient removal in sewage treatment plants and promotion of phosphorus-free detergents are vital to minimize the impact of nitrogen and phosphorus pollution on Europe's.
