| Abstract/Contents: | "This study was carried out to investigate the removal rates of Cd and Pb of the litters in the Phragmites communis, Miscanthus sacchariflorus, Typha angustata, Scirpus tabernaemontani grassland aquatic ecosystem in the lake Paldangho. The annual production of Cd and Pb were 0.005g/m2, 0.21g/m2 in P. communis, 0.004g/m2, 0.08g/m2 in M. sacchariflorus, 0.023g/m2, 0.42g/m2 in T. angustata and 0.020g/m2, 0.23g/m2 in S. tabernaemontani, respectively. The removal rates of Cd and Pb of the litters were 0.83, 0.85 in P. communis, 0.36, 0.54 in M. sacchariflorus, 0.61, 0.51 in T. angustata and 0.76, 0.71 in S. tabernaemontani, respectively. The times required to decay 50, 95, 99 percent of the steady state level and turnover values of cadmium on the grassland floor were 0.83, 3.60, 6.00 years in P. communis, 1.90, 8.24, 13.74 years in M. sacchariflorus, 1.15, 4.96, 8.27 years in T. angustata and 0.91, 3.95, 6.58 years in S. tabernaemontani. The times required to decay 50, 95, 99 percent of the steady state level and turnover values of lead on the grassland floor were 0.81, 3.51, 5.86 years in P. communis, 1.28, 5.56, 9.26 years in M. sacchariflorus, 1.37, 5.94, 9.90 years in T. angustata and 0.97, 4.21, 7.02 years in S. tabernaemontani." |
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