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Factors influencing chlorophyll a concentration in the Yangtze connected lakes
? by PSP Volume 18 – No 10. 2009 Fresenius Environmental Bulletin
1894
FACTORS INFLUENCING CHLOROPHYLL A
CONCENTRATION IN THE YANGTZE-CONNECTED LAKES
Bao-Zhu Pan1,2, Hai-Jun Wang1, Xiao-Min Liang1, Hong-Zhu Wang1
1State Key Laboratory of Freshwater Ecology and Biotechnology, Institute of
Hydrobiology, Chinese Academy of Sciences, Wuhan 430072, P.R. China
2Graduate School of the Chinese Academy of Sciences, Beijing 100039, P.R. China
ABSTRACT
To determine the environmental factors influencing
phytoplankton chlorophyll a (Chl a), field investigations
were conducted in three river-connected lakes (Dongting
Lake, Poyang Lake and Shijiu Lake) of the Yangtze flood-
plain in 2004. Results showed that the average Chl a con-
centration in these lakes ranged from 2.98 to 3.65 mg m-3.
The major factors influencing Chl a in lentic and lotic re-
gions were total phosphorus (TP) and water velocity (U),
respectively. Multiple relationships including total nitro-
gen (log10TN) and water depth (log10Z) were established.
Further analyses found that the absolute Chl a and slope
of log10Chl a=f (log10TP) in the river-connected lakes
were obviously lower than those in the river-isolated lakes.
This suggests the river-lake connectivity can significantly
modify relationship between TP and chlorophyll a con-
centration.
KEYWORDS: chlorophyll a, water velocity, total phosphorus,
river-connected lakes.
INTRODUCTION
Chlorophyll a (Chl a) is widely used as a measure of
phytoplankton biomass. It has been associated with many
factors in the former researches. Studies on lentic system,
e.g. in temperate and subtropical lakes and reservoirs, con-
firmed the strong dependence of Chl a concentration on
total phosphorus (TP) [1-4]. The nutrient-Chl a relation-
ship was generally a non-linear function with large unex-
plained variations, suggesting that other factors also limit
algal growth, e.g. physical ones (water depth, water t
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