Effects of water depth and sediment nutrients on Vallisneria spinulosa in Lake Poyang
| Autor: | Yunlu Shen, Xingzhao Dai, Zhengong Tong, Caixia Kang |
|---|---|
| Rok vydání: | 2019 |
| Předmět: |
0106 biological sciences
growth Wetland 010501 environmental sciences Aquatic Science high nutrient load 01 natural sciences Nutrient water depth lcsh:QH540-549.5 lcsh:Environmental sciences Ecology Evolution Behavior and Systematics 0105 earth and related environmental sciences lcsh:GE1-350 Hydrology geography geography.geographical_feature_category 010604 marine biology & hydrobiology v. spinulosa food and beverages Sediment winter bud Water depth Environmental science Vallisneria spinulosa lcsh:Ecology |
| Zdroj: | Journal of Freshwater Ecology, Vol 34, Iss 1, Pp 263-272 (2019) |
| ISSN: | 2156-6941 0270-5060 |
| DOI: | 10.1080/02705060.2018.1559243 |
| Popis: | Poyang Lake, the largest freshwater lake in China, has experienced a large decrease in wetland area due to long-term overutilization and especially after the hydrological drought events from 2003. This outdoor study was conducted to elucidate the impacts of drought and high concentrations of N on Vallisneria spinulosa. Compared with the 60 cm water depth, the 30 cm water depth caused no difference except lower leaf weight and greater winter bud number per plant growing in the sediment from Poyang Lake. After 400 mg/L NH4+-N was added to the sediment, the leaf weight, root weight, root length, winter bud number, ramet number and stolon weight of V. spinulosa declined greatly. The high NH4+-N content in sediment increased the influence of low water depth on V. spinulosa expressed as the relatively light fresh weight per winter bud of 0.11 g. The results indicated that both a low water depth in spring and high N concentration impacted V. spinulosa and the high concentration of NH4+-N limited the adaptation of V. spinulosa to the decline in water depths. Thus, besides water-level management, nutrient control is also required to protect and restore aquatic macrophytes in Poyang Lake. |
| Databáze: | OpenAIRE |
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