Chang S P, Chuang S M
Department of Environmental Engineering, Kun Shan University of Technology, Yun Kan, Tainan County, Taiwan.
Water Sci Technol. 2001;44(6):19-26.
Taiwan is an island off the southeastern coast of China with total area of roughly 36,000 km2. The geographic position of Taiwan is between 21degrees 45' 25" to 25 degrees 56' 31" north latitude and 119 degrees 18' 3"to 124 degrees 34' 30" east longitude and includes both tropical and subtropical areas. The study was carried out at twenty main reservoirs in Taiwan area from 1994 to 1998. The study revealed that the water quality of most reservoirs gradually deteriorated during the study period. Total phosphorus concentrations over 60 microg/L were observed in 12.5% of these reservoirs in 1994, but in 22.2% of these reservoirs in 1998. Total nitrogen concentrations over 1.0 mg/L were observed in 37.5% of these reservoirs in 1994, but in 94.4% of these reservoirs in 1998. Secchi disc transparency below 2 m was observed in 75% of these reservoirs in 1994, but in 83.3% of these reservoirs in 1998. Chlorophyll a concentrations over 15 mg/m3 were observed in 12.5% of these reservoirs in 1994, but in 27.8% of these reservoirs in 1998. The TN:TP mass ratios (wt/wt) of all the studied reservoirs except Akungting Reservoir, Fongshan Reservoir, and Chengching Reservoir are higher than 16. The study results on nutrient limitation indicated that phosphorus is the primary limiting nutrient in Taiwan reservoirs except Akungting Reservoir, Fongshan Reservoir, and Chengching Reservoir.
台湾是中国东南沿海的一个岛屿，总面积约36000平方公里。台湾的地理位置在北纬21度45分25秒至25度56分31秒、东经119度18分3秒至124度34分30秒之间，涵盖热带和亚热带地区。该研究于1994年至1998年在台湾地区的20座主要水库进行。研究表明，在研究期间，大多数水库的水质逐渐恶化。1994年，12.5%的水库总磷浓度超过60微克/升，但在1998年，这一比例为22.2%。1994年，37.5%的水库总氮浓度超过1.0毫克/升，但在1998年，这一比例为94.4%。1994年，75%的水库塞氏盘透明度低于2米，但在1998年，这一比例为83.3%。1994年，12.5%的水库叶绿素a浓度超过15毫克/立方米，但在1998年，这一比例为27.8%。除阿公店水库、凤山水库和澄清湖水库外，所有研究水库的总氮与总磷质量比（重量/重量）均高于16。营养限制的研究结果表明，除阿公店水库、凤山水库和澄清湖水库外，磷是台湾水库的主要限制营养元素。
