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Water 2017, 9(7), 539; https://doi.org/10.3390/w9070539

Carbon Dioxide Emissions from the Littoral Zone of a Chinese Reservoir

1
Key Laboratory of Ecosystem Network Observation and Modeling, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
2
School of Nature Conservation, Beijing Forestry University, Beijing 100083, China
3
School of Geosciences, The University of Edinburgh, Edinburgh EH9 3FF, UK
4
Beijing Shoufa Tianren Ecological Landscape Co., Ltd., Beijing 102600, China
5
School of Humanities and Laws, Tianjin Polytechnic University, Tianjin 300387, China
*
Author to whom correspondence should be addressed.
Received: 3 May 2017 / Revised: 10 July 2017 / Accepted: 14 July 2017 / Published: 19 July 2017
(This article belongs to the Special Issue Ecological Responses of Lakes to Climate Change)
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Abstract

The continuous increase in the number of reservoirs globally has raised important questions about the environmental impact of their greenhouse gases emissions. In particular, the littoral zone may be a hotspot for production of greenhouse gases. We investigated the spatiotemporal variation of CO2 flux at the littoral zone of a Chinese reservoir along a wet-to-dry transect from permanently flooded land, seasonally flooded land to non-flooded dry land, using the static dark chamber technique. The mean total CO2 emission was 346 mg m−2 h−1 and the rate varied significantly by water levels, months and time of day. The spatiotemporal variation of flux was highly correlated with biomass, temperature and water level. Flooding could play a positive role in carbon balance if water recession occurs at the time when carbon gains associated with plant growth overcomes the carbon loss of ecosystem. The overall carbon balance was analysed using cumulative greenhouse gases fluxes and biomass, bringing the data of the present study alongside previously published, simultaneously measured CH4 and N2O fluxes. For the growing season, 12.8 g C m−2 was absorbed by the littoral zone. Taking CH4 and N2O into the calculation showed that permanently flooded sites were a source of greenhouse gases, rather than a sink. Our study emphasises how water level fluctuation influenced CO2, CH4 and N2O in different ways, which greatly affected the spatiotemporal variation and emission rate of greenhouse gases from the littoral zone. View Full-Text
Keywords: greenhouse gas fluxes; reservoir; littoral zone; flooding greenhouse gas fluxes; reservoir; littoral zone; flooding
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Yang, M.; Grace, J.; Geng, X.; Guan, L.; Zhang, Y.; Lei, J.; Lu, C.; Lei, G. Carbon Dioxide Emissions from the Littoral Zone of a Chinese Reservoir. Water 2017, 9, 539.

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