4.4. The change of P and COD concentrations
COD concentrations were low, so the P contributions from COD
were low. The relationship of TP and COD was fake in LT, or its slope
must be high inMTby the sediment upfloat (Table 4). The curve simulation
inMTsuggested that the P decrease rapidlywhenTwashigher
than 14 _C (Fig. 3b). That is to say, a lot of P was in water body in LT,
which were absorbed by hydrophytes in MT, including the P released