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??????
?????

• ???????

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???    H2O
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Water

• ???

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The Hydrangea macrophylla blossoms in pink or
blue, depending on soil pH. In acid soils the
flowers will be blue, in alkaline soils the
flowers will be pink 1 Acidic conditions
convert the aluminum compounds normally present
in the soil into a form that the shrub can
absorb, resulting in a blue flower. In alkaline
soil, the aluminum remains tied up in insoluble
compounds. The result? Pink flowers.
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Water
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??????

• (1) ?????
• ??,??,??,??,??
• (2) ?????
• pH?,??,??,??(DO),?????(COD),
• ?????(BOD)?????? ??? ?????, ???
• (3) ?????
• ????,????,???,????

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• ????????????????????
• DO???The dissolved oxygen.
• DO ? 5 ppm(mg/L), required for a diversified
  warm-water biota.
• ?????????????????,????????,????????????,
  ?0C?14.6mg/l?35 C? ?7mg/l???????????????????????
  ????????????????,????????????????????????

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????? BOD

• BOD???????????????????????,?????????
• ????????????????????????????????????BOD???????????
  ???,?????????,BOD???
• ?????????????????????, ??BOD???????????????????B
  OD???????????????????,??,???,?????????????
• ?????BOD???2OC? ?????????????????
  ??CO2?H2O????????????(UOD)?BOD??????
  ???????????,????????????????

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?????(COD)

• ????????????????????????????? ???,????????????????
  CO2?H2O,???????????COD???,??????????????????????
  

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• ???(hydrologic cycle)???????????????

????????????,??????(???????)????????????,?????????
????????????? ???????,???3 1.?????????,??????????
?? 2.????????????????????
3.???????????,?????????????,???????
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??????    ??????????? ?????-????????-??????????
??-????????????-?????? ?????-?????