Abstract:

Water samples from two near rivers respectively around bamboo stands and natural forests were collected in three sampling points in two months interval from May 2006 to May 2007. It was found that the quality of water systems under the bamboo stands was much worse than that under the natural forest. The concentration of total N, nitrate N, and organic N in two rivers appeared higher in wet season (during March and May), than the other months that had less rainfall. However, the concentration of total P and dissolved C and the values of COD and BOD were much higher in dry season (during September and January), and the peak values of water from river around bamboo stands appeared in November. The average of concentrations of total N in water from river around bamboo stands was 4.24 mg·L^-1 and 2.15 times greater than that around the natural forest. The corresponding values for NO₃-N was 2.01 mg·L^-1 and 4.07 times, for NH⁺₄-N was 0.07 mg·L^-1 and 0.66 times, for total P was 0.05 mg·L^-1 and 1.39 times, for dissolved organic C was 17.78 mg·L^-1 and 2.87 times. The results showed that the river around bamboo stands was polluted by N, P and DOC.

Key words: water quality, dynamics, Phyllostachys praecox f. prevernalis