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题名: Effects of high ammonium enrichment in water column on the clonal growth of submerged macrophyte Vallisneria natans
作者: Rao, Qingyang1, 2; Deng, Xuwei1; Su, Haojie3; Xia, Wulai1, 2; Wu, Yao1, 2; Zhang, Xiaolin1; Xie, Ping1
关键词: Clonal growth ; Ammonium ; Young ramets ; Free amino acid ; Carbohydrate ; Submerged macrophyte
刊名: ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
发表日期: 2018-11-01
DOI: 10.1007/s11356-018-3146-0
卷: 25, 期:32, 页:32735-32746
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: As we know, the survival of young ramets and stolons is essential for the clonal growth of many aquatic plants. However, few NH4+ enrichment experiments on clonal growth of submerged macrophytes have been conducted to provide possible evidences for their declines in eutrophic lakes. Here, the growth and physiological responses of V. natans to the enrichment of NH4+-N were examined under six inorganic nitrogen (IN, i.e., the sum of nitrate nitrogen (NO3--N) and ammonium nitrogen (NH4+-N)) concentrations (control, 2.5, 4.5, 6.5, 8.5, and 10.5mgL(-1)). When NH4+-N concentration increased over 0.5mgL(-1), free amino acid (FAA) contents in leaves and stolons increased while soluble carbohydrate (SC) and starch contents decreased, and major growth indices (total biomass of plants, number of ramets, and stolon dry weight (DW)) also showed a degressive tendency. Remarkably, the stolon DW significantly declined with increasing FAA, but significantly positively related to SC and starch. These results indicated that clonal growth of V. natans was inhibited by high NH4+-N concentration, and imbalance of C-N metabolism of stolons partly explained the decline of submerged clonal macrophytes. In this study, the leaves of new and small (NS) ramets contained significantly more FAA and less SC than that of mature and mother (MM) plants, indicating that the C-N metabolism of young ramets was easier to be disrupted, consequently inhibiting the clonal growth of aquatic plants. Furthermore, under the condition of high NH4+-N concentration, FAA may be a useful indicator of both macrophyte growth and physiological stress of plants.
关键词[WOS]: NITROGEN LOADING DIFFER ; FREE AMINO-ACIDS ; SHALLOW LAKES ; LOUR. HARA ; SPINULOSA HYDROCHARITACEAE ; MYRIOPHYLLUM-SPICATUM ; PHYSIOLOGICAL STRESS ; MESOCOSM EXPERIMENT ; FORAGING BEHAVIOR ; SPECIES RICHNESS
语种: 英语
项目资助者: Major Science and Technology Program for Water Pollution Control and Treatment(2017ZX07203-004-001)
WOS记录号: WOS:000448662700082
ISSN号: 0944-1344
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/56100
Appears in Collections:淡水生态学研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, 7 Donghu South Rd, Wuhan 430072, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
3.Peking Univ, Dept Ecol, Coll Urban & Environm Sci, Beijing 100871, Peoples R China
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