Next Article in Journal
Storm Flood Characteristics and Identification of Periodicity for Flood-Causing Rainstorms in the Second Songhua River Basin
Next Article in Special Issue
Effects of Exposed Artificial Substrate on the Competition between Phytoplankton and Benthic Algae: Implications for Shallow Lake Restoration
Previous Article in Journal
Effects of Reducing Convective Acceleration Terms in Modelling Supercritical and Transcritical Flow Conditions
Previous Article in Special Issue
Implications of Human Activities, Land Use Changes and Climate Variability in Mediterranean Lakes of Greece

Response of Vallisneria natans to Increasing Nitrogen Loading Depends on Sediment Nutrient Characteristics

by 1,2, 3, 4, 1,2, 1, 1, 2,5 and 1,2,6,*
State Key Laboratory of Lake Science and Environment, Nanjing Institute of Geography and Limnology, Chinese Academy of Sciences, No. 73 East Beijing Road, Nanjing 210008, China
Sino-Danish Centre for Education and Research (SDC), University of Chinese Academy of Sciences, Beijing 100049, China
Key Laboratory of Genetic Breeding and Aquaculture Biology of Freshwater Fishes, Ministry of Agriculture, Freshwater Fisheries Research Center, Chinese Academy of Fishery Sciences, Wuxi 214081, China
School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China
Department of Bioscience and Arctic Research Centre, Aarhus University, 8600 Silkeborg, Denmark
College of Fisheries and Life Science, Shanghai Ocean University, Shanghai 201306, China
Author to whom correspondence should be addressed.
Academic Editor: Benoit Demars
Water 2016, 8(12), 563;
Received: 4 September 2016 / Revised: 14 November 2016 / Accepted: 24 November 2016 / Published: 30 November 2016
(This article belongs to the Special Issue Lake Restoration and Management in a Climate Change Perspective)
High nitrogen (N) loading may contribute to recession of submerged macrophytes in shallow lakes; yet, its influences vary depending on environmental conditions. In August 2013, we conducted a 28-day factorial-designed field mesocosm experiment in Lake Taihu at the Taihu Laboratory for Lake Ecosystem Research (TLLER) to examine the effects of high N loading on the growth of Vallisneria natans in systems with contrasting sediment types. We ran the experiments with two levels of nutrient loading—present-day external nutrient loading (average P: 5 μg·L−1·day−1, N: 130 μg·L−1·day−1) and P: 5 μg·L−1·day−1, and with three times higher N loading (N: 390 μg·L−1·day−1) and used sediment with two contrasting nutrient levels. V. natans growth decreased significantly with increasing N loading, the effect being dependent, however, on the nutrient status of the sediment. In low nutrient sediment, relative growth rates, leaf biomass and root biomass decreased by 11.9%, 18.2% and 23.3%, respectively, at high rather than low N loading, while the decline was larger (44.0%, 32.7% and 41.8%, respectively) when using high nutrient sediment. The larger effect in the nutrient-rich sediment may reflect an observed higher shading of phytoplankton and excess nutrient accumulation in plant tissue, though potential toxic effects of the high-nutrient sediment may also have contributed. Our study confirms the occurrence of a negative effect of increasing N loading on submerged plant growth in shallow nutrient-enriched lakes and further shows that this effect is augmented when the plants grow in nutrient-rich sediment. External N control may, therefore, help to protect or restore submerged macrophytes, especially when the sediment is enriched with nutrients and organic matter. View Full-Text
Keywords: nitrogen loading; sediments; Vallisneria natans; growth nitrogen loading; sediments; Vallisneria natans; growth
Show Figures

Figure 1

MDPI and ACS Style

Gu, J.; Xu, Z.; Jin, H.; Ning, X.; He, H.; Yu, J.; Jeppesen, E.; Li, K. Response of Vallisneria natans to Increasing Nitrogen Loading Depends on Sediment Nutrient Characteristics. Water 2016, 8, 563.

AMA Style

Gu J, Xu Z, Jin H, Ning X, He H, Yu J, Jeppesen E, Li K. Response of Vallisneria natans to Increasing Nitrogen Loading Depends on Sediment Nutrient Characteristics. Water. 2016; 8(12):563.

Chicago/Turabian Style

Gu, Jiao, Zenghong Xu, Hui Jin, Xiaoyu Ning, Hu He, Jinlei Yu, Erik Jeppesen, and Kuanyi Li. 2016. "Response of Vallisneria natans to Increasing Nitrogen Loading Depends on Sediment Nutrient Characteristics" Water 8, no. 12: 563.

Find Other Styles
Note that from the first issue of 2016, MDPI journals use article numbers instead of page numbers. See further details here.

Article Access Map by Country/Region

Back to TopTop