必须是P循环啊,P主要以磷酸盐参与循环,属于固体,无法参与大气循环
C是由CO2参与
O是由水蒸汽参与
N则是NH3等
S主要是H2S
不懂可以继续问
话说要用英文回答嘛?
The biogeochemical cycles 〔生物地球化学循环〕of C, O, N, S and P are
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