鄱阳湖氮磷营养盐对浮游植物群落影响研究

Research on the of Nitrogen and Phosphorus on the Phytoplankton Community in Poyang Lake

于2011年对鄱阳湖水体进行藻类群落的生态调查及理化数据测定,运用典范对应分析对鄱阳湖氮磷营养盐与藻类群落的相关性进行研究。结果表明,鄱阳湖藻类生物量在春季(5.72mg/L)及秋季(5.12mg/L)出现2个峰值,最低值出现在夏季(3.41mg/L);氮磷变化趋势基本相同,都是在夏季出现最低值,冬季出现最高值,氮营养盐浓度相对较高,氮磷比全年较高。藻类群落的季节性变化规律为全年绿藻占优势,除此之外,蓝藻在春秋季占优势,硅藻在冬季占优势,其群落演替是导致藻类丰度与营养因子相关性出现季节性差异的重要原因;藻类群落的分布主要受总磷、硝氮、氨氮的影响,其中春秋季节氨氮与藻类群落分布的相关性大于硝氮,夏冬则反之。

The physicochemical data and algae community in Poyang Lake was analyzed in 2011 to correlate nutrients （N, P） and algae community by Canonical Correspondence Analysis. Results show that biomass peaks of algae appear in spring （5. 72rag/L） and au tumn （5.12 mg/L）, the minimum value is 3.41 mg/L in summer. N and P values have similar changing tendency with biomass of al gae. Concentration of N is higher than P and the ratio of N/P is relatively high throughout the year. Chlorophyta is the dominant species during all seasons. Besides, Cyanophyta is dominant in spring and autumn while Bacillariophyta is dominant in summer and winter. Community succession is the key factor of different seasonal correlations between algae abundance and nutritional factors. The distribution of algae is affected by TP, NO-3-N, NH＋-N. NH＋-N has greater correlations with algae community distribution than NO-3-N in spring and autumn, and vice versa in the other seasons.