Spatial-temporal Variations Of Nitrogen And Phosphorus Of Water Quality And Reed In Taipa-Coloane Reclamation Area Wetlands Of Macao

A study of reed nutrients and water quality of Taipa-Coloane reclamation area wetlands in Macao were carried out from November 2003 to September 2004. The aim of this research was to evaluate the environment of Taipa-Coloane reclamation area wetlands. The results of these experiments were listed below. 1 The water temperate maximized in July and minimized in March .The average water temperate in brackish lack was 24.5℃ and that in Shizimen channel was 23.4 ℃ .The average salinity in brackish lack was 12.2 and that in Shizimen channel was 14.2. The area of Shizimen channel was closed to the estuary of Pearl River, so the salinity of Shizimen channel was higher than the salinity of brackish lack. The values of pH in the whole year were between 6.56 and 8.54 in two places. 2 The average of ammonia, nitrite, nitrate, total nitrogen, total inorganic nitrogen, phosphate and total phosphorus in brackish lack were 0.100mg/L 0.007 mg/L 0.049mg/L. 0.593mg/L 0.156mg/L 0.010mg/L and 0.126 mg/L,respectively, and those in Shizimen channel were 0.183 mg/L 0.066 mg/L 0.808mg/L 1.700mg/L 1.057mg/L 0.032 mg/L and 0.270 mg/L, respectively. The nutrients of Shizimen channel were higher than that of the brackish lack.3 Nitrogen contents of leaves stems and rhizomes of reed in Taipa-Coloane wetlands of Macao were 3.32% 1.27% and 0.88% , respectively, and phosphorus contents of those were 0.38% 0.18% and 0.09%, respectively. Nitrogen and phosphorus contents of reed maximized in autumn and winter and minimized in spring and summer. The biomasses of reed were highest in November, reaching at 2679 g/m~2, and lowest in May, being 1688 g/m~2.