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题名: Stable carbon isotopic composition of submerged plants living in karst water and its eco-environmental importance
作者: Wang, Pei1, 2, 3, 4; Hu, Gang1, 2, 5; Cao, Jianhua1, 2
关键词: Zhaidi River ; Submerged plants ; Stable carbon isotope ; Dissolved inorganic carbon ; Karst water environment
刊名: AQUATIC BOTANY
发表日期: 2017-05-01
DOI: 10.1016/j.aquabot.2017.03.002
卷: 140, 页:78-83
收录类别: SCI ; ISTP
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Plant Sciences ; Marine & Freshwater Biology
研究领域[WOS]: Plant Sciences ; Marine & Freshwater Biology
英文摘要: The stable carbon isotopic composition of submerged plants (delta C-13(p)) can be controlled by physiological and environmental factors. Herein, we took advantage of a short, natural karst river with an annual mean bicarbonate (HCO3-) value of 3.8 mmol L-1 to study the stable carbon isotopic composition of submerged plants along the river and the influence of environmental conditions on the delta C-13(p) values. The delta C-13(p) values of Ottelia acuminata, Potamogeton wrightii, Vallisneria natal's, and Hydrilla verticillata from upstream to downstream show a gradient and ranged from -34.8 parts per thousand to -27.8 parts per thousand, -36.6 parts per thousand to -23.7 parts per thousand, -35.1 parts per thousand to -25.3 parts per thousand, and -38.6 parts per thousand to -26.3 parts per thousand, respectively and even more depleted values for the first two species at the uppermost site. Diurnal variation of water chemistry and concentration of the dissolved inorganic carbon (DIC) and the stable carbon isotopic composition of DIC (delta C-13(D)) indicate that the macrophytes and other primary producers in the river have a very high net photosynthetic rate. The gradient of delta C-13(p) values was consistent with CO2 being a declining source of inorganic carbon for photosynthesis in the downstream transect. The results demonstrate that the high DIC concentration with lower negative delta C-13 value, particularly in karst water environment has a significant role in controlling the stable carbon isotopic composition of submerged plants living in it.
关键词[WOS]: CRASSULACEAN ACID METABOLISM ; INORGANIC CARBON ; CONCENTRATING MECHANISMS ; DIFFERENTIAL ABILITY ; SURFACE-WATER ; RIVER ; CO2 ; PHOTOSYNTHESIS ; BICARBONATE ; GROUNDWATER
语种: 英语
项目资助者: Chinese Geological Survey Project(12120113005300) ; Guangxi Science and Technology Development Program(14125008-2-1) ; Geological Exploration projects of Shandong Province(2016-79) ; Karst Dynamics Laboratory ; MLR ; GZAR(14-B-04 ; 14-B-03)
WOS记录号: WOS:000405044500012
ISSN号: 0304-3770
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/32860
Appears in Collections:其他_期刊论文

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作者单位: 1.Chinese Acad Geol Sci, MLR, Karst Dynam Lab, Inst Karst Geol, Guilin 541004, Peoples R China
2.Chinese Acad Geol Sci, Inst Karst Geol, GZAR, Guilin 541004, Peoples R China
3.China Univ Geosci, Beijing 100083, Peoples R China
4.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
5.Guilin Univ Technol, Guilin 541004, Peoples R China
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