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澳洲南澳論文代寫:氮磷化合物

Keywords:澳洲南澳論文代寫

水體中氮磷化合物比例是決定限制因子的重要因素,是控制機制的一個重要因素。(表1)。磷是淡水浮游植物的主要限制因子。對于大型海洋地區,經常有氮作為限制性營養物質,特別是在夏季。在春季,如河流羽狀物等中等區域常受磷的限制,但在夏季可能會變成二氧化硅或氮的限制。這種現象幾乎發生在世界各地。有人為養分輸入的三個主要來源:徑流、侵蝕和施肥的農業區的浸出,和城市生活污水和工業廢水。大氣中氮的沉積(來自動物繁殖和燃燒氣體)也很重要。據歐洲環境署說,“氮污染物的主要來源是從農田中流失,而磷污染主要來自家庭和工業,包括含磷洗滌劑。二十世紀工業生產和內部消費的快速增長導致了大量富含養分的廢水。雖然最近在農業實踐中對氮和磷有更好的管理,但在某些地區出現了過量的糞肥,這可能會引起土壤磷的飽和。澳洲南澳論文代寫:氮磷化合物污水處理廠的養分去除和無磷洗滌劑的推廣對減少氮磷污染對歐洲水體的影響至關重要。
澳洲南澳論文代寫:氮磷化合物
<标题> 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.

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