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马雨, 李艳, 卞世俊, 崔永德, 王海军. 大型浅水湖泊太湖藻类浊度与非藻类浊度的变异规律[J]. 水生生物学报, 2021, 45(3): 609-616. DOI: 10.7541/2021.2020.187
引用本文: 马雨, 李艳, 卞世俊, 崔永德, 王海军. 大型浅水湖泊太湖藻类浊度与非藻类浊度的变异规律[J]. 水生生物学报, 2021, 45(3): 609-616. DOI: 10.7541/2021.2020.187
MA Yu, LI Yan, BIAN Shi-Jun, CUI Yong-De, WANG Hai-Jun. VARIATIONS OF ALGAL AND NON-ALGAL TURBIDITY IN A LARGE SHALLOW LAKE——TAIHU LAKE[J]. ACTA HYDROBIOLOGICA SINICA, 2021, 45(3): 609-616. DOI: 10.7541/2021.2020.187
Citation: MA Yu, LI Yan, BIAN Shi-Jun, CUI Yong-De, WANG Hai-Jun. VARIATIONS OF ALGAL AND NON-ALGAL TURBIDITY IN A LARGE SHALLOW LAKE——TAIHU LAKE[J]. ACTA HYDROBIOLOGICA SINICA, 2021, 45(3): 609-616. DOI: 10.7541/2021.2020.187

大型浅水湖泊太湖藻类浊度与非藻类浊度的变异规律

VARIATIONS OF ALGAL AND NON-ALGAL TURBIDITY IN A LARGE SHALLOW LAKE——TAIHU LAKE

  • 摘要: 为探究大型浅水湖泊中沉水植物对浊度的影响, 对大型浅水湖泊——太湖(有草区和无草区)进行了为期1年的野外调查, 将浊度分为藻类浊度(TurbAlg)和非藻类浊度(TurbNonAlg), 分析其变异规律及其对总浊度(TurbTot)贡献率的差异。结果显示: (1) 太湖水体中TurbNonAlg(年均值为2.45/m)为主要的浊度组分, 占总浊度(2.88/m)的83%, 春季时高达89%; (2) 有草区TurbNonAlg(2.52/m)和无草区的(2.37/m)差异不显著(P>0.05); (3) 在相同TP范围内, 有草区TurbAlg (0.21/m)和无草区的(0.32/m)无明显差异(P>0.05), 在夏季时甚至略高于后者。研究表明, 在大型浅水湖泊中, 沉水植物对水体浊度的抑制效果有限, 对非藻类浊度和藻类浊度均未起到有效的控制作用。因此, 在相同营养条件下, 大型浅水湖泊更易发生稳态转换, 且发生转换后恢复原始状态的难度也可能更大。

     

    Abstract: With the eutrophication of lakes, phytoplankton blooms, resulting in the loss of submersed macrophytes and the decline of biodiversity and ecosystem services. The deficiency of underwater light caused by high turbidity was considered to be the primary reason. Up to now, the researches about the relationship between submersed macrophytes and turbidity have been mainly concentrated in small- and medium-sized lakes, but there is limited understanding of such relationship in large shallow lakes, considering probability because the limited macrophytes coverage and larger influence of wind. In order to explore the inhibition effect of submersed macrophytes on turbidity in large shallow lakes, a large shallow lake——Taihu Lake was investigated to explore the variations of algal and non-algal turbidity and analyzed their contribution to total turbidity in the areas with and without submersed macrophytes. The results showed that: (1) Non-algal turbidity (TurbNonAlg) (mean value=2.45/m) was the dominant turbidity contributor in Taihu Lake, counting 83% of the total turbidity (2.88/m), and even reaching 89% in spring; (2) The difference of TurbNonAlg between the areas with (2.52/m) and without submersed macrophytes (2.37/m) was not significant (P>0.05); (3) Under the similar levels of total phosphorus concentration (TP), TurbAlg in the areas with submersed macrophytes (0.21/m) was not significantly different from the areas without (0.32/m) (P>0.05), the former was even higher than the latter in summer. The results suggested that in such large shallow lakes, submersed macrophytes cannot inhibit the turbidity effectively in both TurbAlg and TurbNonAlg. Therefore, the large shallow lakes tend to shift from clear to turbid state easier than the small- and medium-sized lakes under similar nutrient level, and the back forward shift might be more difficult. The results suggest that there is little benefit from planting submersed plants in large shallow lakes to reduce turbidity.

     

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