Skip to main content
Article thumbnail
Location of Repository

A 150-year record of recent changes in human activity and eutrophication of Lake Wushan from the middle reach of the Yangze River, China

By Enlou Zhang, Enfeng Liu, Richard Jones, Peter Langdon, Xiangdong Yang and Ji Shen

Abstract

In order to determine baseline conditions (pre-impact) and recent changes to lakes on the middle reach of the Yangtze River, China, a lake sediment core was extracted from Lake Wushan covering the last ca 150 years. Detailed chemical, biological (subfossil chironomids), and physical analyses of the lake sediments were undertaken. The data showed consistent trends of increased productivity since the early 1920s, notably significant changes in the chironomid fauna which were associated with changes in the sedimentological and stable isotope proxies. More typically eutrophic chironomid taxa first appeared around this time that had not been present in the lake since at least the 1860s. Further increases in productivity occurred around the 1950s which coincided with the local decline and extirpation of some chironomid taxa, particularly macrophyte associated taxa, which had been present in the lake since at least the late 19th Century. <br/><br/>A chironomid-inferred water total phosphorus (CI-TP) reconstruction produced accurate levels of water TP compared with contemporary measurements (207.4 ?g L-1 TP), and suggested that levels for the late 19th Century were relatively low (50-60 ?g L-1 TP). These reconstructions illustrate the baseline levels that existed pre-impact and provide potential targets for restoration, but they also show the magnitud

Topics: GF, QE, GE
Year: 2010
OAI identifier: oai:eprints.soton.ac.uk:162517
Provided by: e-Prints Soton
Download PDF:
Sorry, we are unable to provide the full text but you may find it at the following location(s):
  • http://dx.doi.org/10.3274/JL10... (external link)
  • Suggested articles


    To submit an update or takedown request for this paper, please submit an Update/Correction/Removal Request.