Stable isotopic composition of submerged plants living in karst water and its eco-environmental importance.

Citation

Material Information

Title:
Stable isotopic composition of submerged plants living in karst water and its eco-environmental importance.
Series Title:
Aquatic Botany
Creator:
Wang, Pei
Hu, Gang
Cao, Jianhua
Publisher:
Elsevier
Publication Date:
Language:
English

Subjects

Subjects / Keywords:
Zhaidi River ( local )
Submerged Plants ( local )
Stable Carbon Isotope ( local )
Dissolved Inorganic Carbon ( local )
Karst Water Environment ( local )
Genre:
serial ( sobekcm )

Notes

Abstract:
The stable carbon isotopic composition of submerged plants (δ13CP) 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 δ13CP values. The δ13CP values of Ottelia acuminata, Potamogeton wrightii, Vallisneria natans, and Hydrilla verticillata from upstream to downstream show a gradient and ranged from −34.8‰ to −27.8‰, −36.6‰ to −23.7‰, −35.1‰ to −25.3‰, and −38.6‰ to −26.3‰, 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 (δ13CD) indicate that the macrophytes and other primary producers in the river have a very high net photosynthetic rate. The gradient of δ13CP 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 δ13C value, particularly in karst water environment has a significant role in controlling the stable carbon isotopic composition of submerged plants living in it.
Original Version:
Aquatic Botany, Vol. 140 (2017-05).

Record Information

Source Institution:
University of South Florida Library
Holding Location:
University of South Florida
Rights Management:
This object is protected by copyright, and is made available here for research and educational purposes. Permission to reuse, publish, or reproduce the object beyond the bounds of Fair Use or other exemptions to copyright law must be obtained from the copyright holder.

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