Impact Analysis on Spatial and Temporal Distributions of Nutrients in Taihu Lake

Guiping Li, Zhongbo Yu, Yiping Li
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Abstract

This study analyzed the spatial and temporal distributions of total nitrogen, total phosphorus and chlorophyll a in Taihu Lake, Easter China, and assessed the migration and dispersion patterns of nutrients in the lake in recent years. The results show that the highest concentrations of the three kinds of nutrients are located in the northern parts of Zhushan Bay and Meiliang Bay, and tend to spread from north to south and from west to east. The maximum total nitrogen concentration appeared in the north as early as 1-2 months earlier than in the south and showed a tendency to appear 1-2 months earlier than the past in various stations. High levels of total phosphorus remained progressively shorter periods from north to south. The maximum level of chlorophyll a appeared gradually later from north to south. As the southeastern region was affected by temperature, the peak there appeared twice in a year. Changes in levels of total nitrogen, chlorophyll a and biomass appeared to have significant inter-annual cycles. Changes in levels of biomass showed a 4-month lag in comparison to nitrogen.
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太湖水体养分时空分布影响分析
本研究分析了太湖总氮、总磷和叶绿素a的时空分布特征,评价了近年来太湖营养物质的迁移和分散格局。结果表明:3种营养物浓度最高的区域均位于珠山湾和梅梁湾北部,并呈现由北向南、由西向东扩散的趋势;总氮浓度最大值在北方早于南方早1 ~ 2个月出现,各站点均有早于过去1 ~ 2个月出现的趋势。高水平的总磷从北向南持续时间逐渐缩短。叶绿素a的最大值从北向南逐渐晚出现。东南地区受气温影响较大,一年出现两次峰值。总氮、叶绿素a和生物量的变化具有显著的年际循环。与氮相比,生物量水平的变化表现出4个月的滞后。
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