Influence of cascaded exploitation of small hydropower on riparian plant communities in Modaoxi River

SUN Rong; YUAN Xing-zhong; LIU Hong; LI Xuan

Volume 22 Issue 4

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Advances in Water Science > 2011 > 22(4): 561-567.

SUN Rong, YUAN Xing-zhong, LIU Hong, LI Xuan. Influence of cascaded exploitation of small hydropower on riparian plant communities in Modaoxi River[J]. Advances in Water Science, 2011, 22(4): 561-567.

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Influence of cascaded exploitation of small hydropower on riparian plant communities in Modaoxi River

1.
College of Chemical Engineering, Huaqiao University, Xiamen 361021, China;
2.
College of Resource and Environmental Science, Chongqing University, Chongqing 400044, China;
3.
Key Laboratory of the Exploitation of Southwest Resources & the Environmental Hazards Control Engineering,Ministry of Education, Chongqing University, Chongqing 400030, China;
4.
Sino-coal International Engineering Group, Chongqing Design & ResearchInstitute, Chongqing 400016, China

Funds: The study is financially supported by the National Natural Science Foundation of China(No.50749045)and the National Key Technologies R&D Program of China during the 11th Fiveyear Plan Period(No.2006BAJ08B01)

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Received Date: June 20, 2010
Revised Date: May 13, 2011

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Abstract

To understand the influence of dams on connectivity of riparian plant communities,three small hydropower plants from up-to-downstream of Modaoxi River were surveyed in September 2008.Plant samples were taken from the small hydropower plants,as well as at the upstream dams,downstream dams and downstream outfalls.Species richness and biodiversity of herbs and shrubs were determined in consecutive 1 m² quadrats and 25 m² quadrats,respectively,along a 50 m long belt transect.157 plant species were recorded on a total sample size of 63 quadrats.The resuit shows that the construction of small hydropower plants has significant impacts on river physical variables(such as current velocity,water depth and substrate types)along the nine sampling locations.The riparian plant community has been more or less affected by the dam construction.The overall species richness and herbs varied significantly in different locations.In contrast,the variability in trees and shrubs is found to be insignificant.Local differences in species diversity are also significant.Hygrophyte species richness has been found to be greater in the upstream and outlets than that of in downstream.The construction of small hydropower plants has disturbed the continuity of riparian plants and has a negative impact on the protection of the plant diversity in the river.
- riparian vegetation,
- plant community,
- small hydropower station,
- Modaoxi River

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