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Ecological improvement by restoration on the Jialu River: water quality, species richness and distribution

Xiangshi Kong https://orcid.org/0000-0003-3541-5663 A B , Kai Tian https://orcid.org/0000-0002-7049-0549 C , Yanyan Jia D , Zaihua He B , Siyuan Song B , Xingbing He A , Changguo Xiang A , Shuqing An B F and Xingjun Tian https://orcid.org/0000-0002-0251-2582 B E F
+ Author Affiliations
- Author Affiliations

A Key Laboratory for Ecotourism of Hunan Province, School of Tourism and Management Engineering, Jishou University, Zhangjiajie, 427000, PR China.

B School of Life Sciences, Nanjing University, Nanjing, 210023, PR China.

C Key Laboratory of Ecological Security for Water Source Region of Mid-line Project of South-to-North Diversion Project of Henan Province, College of Agricultural Engineering, Nanyang Normal University, Nanyang, 473061, PR China.

D Huaiyin Institute of Agricultural Sciences, Huaian, 223001, PR China.

E Co-Innovation Center for Sustainable Forestry in Southern China, Nanjing Forestry University, Nanjing, 210037, PR China.

F Corresponding authors. Email: anshq@nju.edu.cn; tianxj@nju.edu.cn

Marine and Freshwater Research 71(12) 1602-1615 https://doi.org/10.1071/MF19262
Submitted: 26 July 2019  Accepted: 27 January 2020   Published: 17 March 2020

Abstract

The Jialu River has experienced serious water quality deterioration and biodiversity decline. An ecological restoration project was undertaken. We investigated water quality, species richness and distribution before and after restoration to describe ecological improvements on the Jialu River. After the project, total nitrogen (TN), total phosphorus (TP), chemical oxygen demand (COD) and ammonium nitrogen (NH4+-N) decreased by 38.69, 40.52, 39.06 and 45.07% respectively. Concentrations of these indices were maintained at steady levels after restoration, indicating stable purification capacity had been established. However, TN, TP and NH4+-N concentrations were still higher than Level V of the Chinese surface water standards. In all, 155 species, belonging to 94 families, were found, with shore plants accounting for the largest proportion (26.53%). The biota showed different distribution patterns over space and time, except for species of zooplankton and phytoplankton, which were evenly distributed over space and time. Most species (71.71%) occurred in only one or two sites. Compared with July 2013, by July 2015 species richness had increased, on average, 65.61%. Furthermore, 31 novel native species were found in July 2015, covering the main functional groups (hydrophytes, zoobenthos and fishes). The recovery of an intact food chain as a result of the project facilitated water purification in the short term and the return of birds to the Jialu River in the long term. This study evaluated the recovery of the Jialu River and the results will inform future ecosystem restoration projects.

Additional keywords: biodiversity, biomonitoring, wetlands.


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