Restoration in northern Lake Gehu, a eutrophic lake in China -- Journal of Oceanology and Limnology,2017,35(6):1417-1431

	Cite this paper:
	WU Xiaodong, LI Wenchao, PAN Jizheng, MA Shuzhan, CHEN Bingfa, HE Shangwei. Restoration in northern Lake Gehu, a eutrophic lake in China[J]. Journal of Oceanology and Limnology, 2017, 35(6): 1417-1431

Restoration in northern Lake Gehu, a eutrophic lake in China

WU Xiaodong^1,2, LI Wenchao¹, PAN Jizheng¹, MA Shuzhan³, CHEN Bingfa³, HE Shangwei⁴

1 Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences/State Key Laboratory of Lake Science and Environment, Nanjing 210008, China;
2 University of Chinese Academy of Sciences, Beijing 100049, China;
3 School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215011, China;
4 Yancheng Academy of Environmental Protection Technology and Engineering, Nanjing University, Yancheng 224000, China

Abstract:

Lake Gehu is a severely eutrophic lake in southeast China. A series of restoration measures have been implemented since 2009 in northern Lake Gehu. This study compared aquatic plants, water quality, sediment, and phytoplankton between restoration and control areas to investigate the effect of restoration measures. The results demonstrated that aquatic macrophyte coverage increased from 0% to 10.6%; mean TP, TN, and COD_Mn concentrations decreased by 50.0%, 42.4%, and 40.8%, respectively, compared with those before the measures were carried out; the mean Secchi depth (SD) increased to 42.5 cm, which is 1.4 times higher than that before restoration; the mean euphotic depth (Z_eu) in the summer increased from 91 to 130 cm; the mean chl a concentration decreased from 34.8 to 20.2 μg/L, compared with that before restoration; the Shannon-Wiener index of phytoplankton increased by 28.7%. The mean TP and TN concentrations in sediments decreased by 63.8% and 52.4%, respectively, compared with that before dredging. These results indicate that the restoration in northern Lake Gehu was effective. To complete the transformation from an algae-to a macrophyte-stable state within the region, further measures must be adopted. This restoration of a eutrophic lake can serve as a reference for similar eutrophic lakes.

Key words: Lake Gehu|eutrophication|local areas|restoration

Received: 2016-04-11 Revised: 2016-05-27

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