Alternate trajectories in historic trophic change from two lakes in the same catchment, Huayang Basin, middle reach of Yangtze River, China

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• 作者：Enlou Zhang (1) elzhang@niglas.ac.cn
  Yanmin Cao (12)
  Peter Langdon (3)
  Richard Jones (4)
  Xiangdong Yang (1)
  Ji Shen (1)
• 关键词：Chironomids – ; Eutrophication – ; Total phosphorus – ; Aquatic macrophytes – ; Transfer functions
• 刊名：Journal of Paleolimnology
• 出版年：2012
• 出版时间：August 2012
• 年：2012
• 卷：48
• 期：2
• 页码：367-381
• 全文大小：523.5 KB
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• 作者单位：1. State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing, 210008 China2. Graduate University of Chinese Academy of Sciences, Beijing, China3. School of Geography, University of Southampton, Southampton, SO17 1BJ UK4. Geography, College of Life and Environmental Science, University of Exeter, Exeter, EX4 4QJ UK
• ISSN：1573-0417

文摘

In order to assess how best to manage impacted lake systems, one needs to understand the trophic functioning of the lake system and the recent states through which the lake may have transitioned. Lakes in the middle and lower reaches of the Yangtze have been heavily impacted over recent decades. In order to understand recent changes in functional status, we examined sediment cores covering the last 120 years from two lakes in the same catchment with differing status: one algal-dominated (Taibai Lake) and the other macrophyte-dominated (Longgan Lake). Chironomid head capsules were identified from both sites and an expanded chironomid-total phosphorus (TP) transfer function (21 sites were added to the 30-lake model previously developed by Zhang et al. 2006) was used to assess the lakes’ response to recent anthropogenic change. Quantitative chironomid-inferred TP (CI-TP) reconstructions showed that Taibai Lake experienced clear changes in trophic status since the 1860s. Before the 1950s, the CI-TP concentration was relatively stable around 50–80 μg L−1, while it reached to 80–130 μg L−1 in the latter period. CI-TP for Longgan Lake, however, showed a relative decline from the range of 50–75 μg L−1 since the 1880s to 30–40 μg L−1 in recent years, accompanied by strong evidence from the chironomids for increased macrophyte biomass as TP levels declined. Both reconstructions agreed with diatom inferences of TP from the same lakes. The stark difference between these two sites is thought to reflect a function of macrophyte development, with Taibai Lake losing its plants through increased nutrient levels and internal recycling, whereas Longgan Lake, which is much bigger in area and hence potentially more resilient to change, was able to develop macrophyte communities over the same time period. The positive feedbacks associated with abundant macrophytes retained the clear water state of Longgan Lake, but a further increase in nutrients might lead to decrease in resilience of the relatively stable macrophyte state and loss of benthic pathways of primary production, which would push the lake towards eutrophication. Unless nutrient inputs to Longgan are controlled, Longgan Lake might lose macrophyte communities and follow a developmental pathway similar to that observed in Taibai Lake.