Temporal and spatial changes in nutrients and chlorophyll-a in a shallow lake, Lake Chaohu, China: an 11-year investigation.
Temporal and spatial changes in nutrients and chlorophyll-a in a shallow lake, Lake Chaohu, China: an 11-year investigation.
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DOI：
10.1016/s1001-0742(12)60171-5
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发表时间：
2013-06
影响因子：
6.9
通讯作者：
Libiao Yang;K. Lei;W. Meng;G. Fu;Weijin Yan
中科院分区：
文献类型：
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作者：
Libiao Yang;K. Lei;W. Meng;G. Fu;Weijin Yan
利用2001 ~ 2011年逐月监测资料，对巢湖浅水湖泊中总氮（TN）、总磷（TP）和叶绿素a （Chl-a）的时空变化进行了研究。结果表明，全氮（TN）、总磷（TP）和Chl-a的年平均浓度范围分别为0.08 ~ 14.60 mg/L、0.02 ~ 1.08 mg/L和0.10 ~ 465.90 mg/L。结果表明，巢湖水质在2001 ~ 2011年间没有明显改善，呈高度富营养化。湖西部TP、TN和Chl-a的平均浓度显著高于湖东部，表明了3个水参数的空间分布特征。全氮：总磷（TN:TP）的年平均重量比在10 ~ 20之间，表明磷是该湖泊的限制性养分。TP和Chl-a也有相似的季节性变化。2002-2011年8条主要支流的TP和NH4+负荷量分别在1.56 × 104 ~ 5.47 × 104和0.19 × 104 ~ 0.51 × 104t /年之间，超过了湖泊水环境承载力的3 ~ 6倍。因此，减少分流域和支流的养分负荷对巢湖的恢复至关重要。
Temporal and spatial changes of total nitrogen (TN), total phosphorus (TP) and chlorophyll-a (Chl-a) in a shallow lake, Lake Chaohu, China, were investigated using monthly monitoring data from 2001 through 2011. The results showed that the annual mean concentration ranges of TN, TP, and Chl-a were 0.08–14.60 mg/L, 0.02–1.08 mg/L, and 0.10–465.90 μg/L, respectively. Our data showed that Lake Chaohu was highly eutrophic and that water quality showed no substantial improvement during 2001 through 2011. The mean concentrations of TP, TN and Chl-a in the western lake were significantly higher than in the eastern lake, which indicates a spatial distribution of the three water parameters. The annual mean ratio of TN:TP by weight ranged from 10 to 20, indicating that phosphorus was the limiting nutrient in this lake. A similar seasonality variation for TP and Chl-a was observed. Riverine TP and NH4+loading from eight major tributaries were in the range of 1.56 × 104−5.47 × 104and 0.19 × 104−0.51 × 104tons/yr over 2002–2011, respectively, and exceeded the water environmental capability of the two nutrients in the lake by a factor of 3–6. Thus reduction of nutrient loading in the sub-watershed and tributaries would be essential for the restoration of Lake Chaohu.