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RANDOMLY DIRECTED AND LIGHT WINDS EXACERBATE THE EMERGENCE OF LARGE-SCALE CYANOBACTERIAL BLOOM AREAS IN LAKE TAIHU, CHINA

D. Xu,H. Chen

Published 2020 in Applied Ecology and Environmental Research

ABSTRACT

The global warming, decline in wind speed and extreme rainfall have been documented to promote the expansion of bloom area. However, few studies focus on the effect of wind direction on bloom area. The monthly data between May and September from 2011 to 2018 were collected to analyze the relationship between environmental factors and bloom area. Pearson correlation analysis indicated that bloom area was negatively correlated with monthly proportion of consecutive unidirectional wind days (PCUWD) but positively correlated with chlorophyll a (Chl-a). During the whole studied period, wind speeds were lower than 3.1 m/s and Chl-a concentrations were higher than 20 μg/L in all months. In this case, the sufficient Microcystis biomass could aggregate into large-scale bloom area only by vertical floating. This could explain why no significant relationship between wind speed and bloom area was found in our study. Except for August, wind speed declined each month which promoted the increase of total phosphorus (TP) and Chl-a concentrations. The low value of PCUWD insufficiently transported cyanobacterial patches from other zones to accumulate with the existing cyanobacterial patches in the downwind area of the lake into dense and small-scale surface scum. In May and June, the decreased PCUWD was conducive to maintain a large-scale bloom area.

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