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

文献类型： 外文期刊

作者： Gu, Jiao 1 ; Xu, Zenghong 3 ; Jin, Hui 4 ; Ning, Xiaoyu 1 ; He, Hu 1 ; Yu, Jinlei 1 ; Jeppesen, Erik 2 ; Li, Kuanyi 1 ;

作者机构： 1.Chinese Acad Sci, Nanjing Inst Geog & Limnol, State Key Lab Lake Sci & Environm, 73 East Beijing Rd, Nanjing 210008, Jiangsu, Peoples R China

2.Univ Chinese Acad Sci, Sino Danish Ctr Educ & Res SDC, Beijing 100049, Peoples R China

3.Chinese Acad Fishery Sci, Freshwater Fisheries Res Ctr, Key Lab Genet Breeding & Aquaculture Biol Freshwa, Minist Agr, Wuxi 214081, Peoples R China

4.Jiangnan Univ, Sch Environm & Civil Engn, Wuxi 214122, Peoples R China

5.Aarhus Univ, Dept Biosci, DK-8600 Silkeborg, Denmark

6.Aarhus Univ, Arctic Res Ctr, DK-8600 Silkeborg, Denmark

7.Shanghai Ocean Univ, Coll Fisheries & Life Sci, Shanghai 201306, Peoples R China

关键词： nitrogen loading; sediments; Vallisneria natans; growth

期刊名称：WATER （ 影响因子：3.103； 五年影响因子：3.229 ）

ISSN： 2073-4441

年卷期： 2016 年 8 卷 12 期

页码：

收录情况： SCI

摘要： 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 loadingpresent-day external nutrient loading (average P: 5 gL(-1)day(-1), N: 130 gL(-1)day(-1)) and P: 5 gL(-1)day(-1), and with three times higher N loading (N: 390 gL(-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.

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