Phosphorus  circulates  though  water, the  earth's  crust  and  living  organisms  in  the  phosphorus  cycle, depicted  in  Figure 3-21. In  contrast  to  the  cycles  of  water, carbon, and  nitrogen, the  phosphorus  cycle  does  not  include  the  atmosphere. The  major  reservoirs  for  phosphorous  is  phosphate  salts  containing  phosphate  ions  in  terrestrial  rock  formations  and  ocean  bottom  sediments. The  phosphorus  cycle  is  slow  compared  to  the  water, carbon, and  nitrogen  cycle.
磷的循環需經過水.地球的外殼和生活在其上的生物與磷循環的關係如同表3-21的描述.將磷循環與其他水,碳,氮的循環比較,磷循環中不包括大氣的部份.亞磷的主要儲存是在地球岩層和海底沉積岩中磷酸鹽鎖含有的磷酸鹽離子.磷循環相較於水,碳,氮循環之下,是較慢的循環.
As  water  runs  over  exposed  phosphorus-containing  rocks, it  slowly  erodes  away  inorganic  compounds  that  contain  phosphate  ions. The  dissolved  phosphate  can  be  absorbed  by  the  roots  of  plants  and  by  the  other  producers. Phosphorous  is  transferred  by  food  webs  from  such  producers  to  consumers, eventually  including  detritus  feeders  and  decomposers. In  both  producers  and  consumers, phosphorous  is  a  component  of  biologically  important  molecules  such  as  nucleic  acids  and  energy  transfer  molecules  such  as  ADP  and  ATP. It  is  also  a  major  component  of  vertebrate  bones  and  teeth.
當有包含著磷的岩石被暴露在有水體流動的地方時,它會慢慢地侵蝕掉含有磷酸鹽離子的無機化合物.被分解的磷酸鹽可以被植物的根或其他的生產者所吸收.亞磷的轉換是藉由食物鍊中的生產者及消費者,甚至於是岩屑飼養者以及分解者,不論生產者還是消費者,亞磷是重要的生物組成分子,例如核酸和能量轉換分子ADP和ATP. 它也是脊椎動物的骨頭和牙齒的主要構成成分。

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