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Coupled Carbon-nitrogen Cycling Controls the Transformation of Dissolved Inorganic Carbon Into Dissolved Organic Carbon in Karst Aquatic Systems by Haijuan Zhao; Yongjun Jiang; Qiong Xiao; Cheng Zhang; Hamid M. Behzad is a Environmental Science article available to read on EtoBox.

What is Coupled Carbon-nitrogen Cycling Controls the Transformation of Dissolved Inorganic Carbon Into Dissolved Organic Carbon in Karst Aquatic Systems about?

The cycling of carbon (C) and nitrogen (N) in karst aquatic systems has been shown to be closely related, with coupled control of dissolved organic carbon (DOC) concentrations through the metabolic pathways of subaquatic communities. However, the coupled CN cycling involving in the transformation of dissolved inorganic carbon (DIC) into DOC has not been well-explored. In this study, we chose the Lijiang River, a typical karst aquatic system in Southwest China as our study area and documented its diurnal and seasonal variations in terms of several hydrochemical and isotopic parameters to identify how to couple cycling for C and N. The results of the Bayesian stable isotope-mixing model showed that approximately 50% and 72% of the total DOC formed in summer and winter, respectively, represented autochthonous organic carbon in the Lijiang River. Diurnal monitoring results revealed that DIC and NO3 − transformations were primarily controlled by metabolic processes (photosynthesis and respiration) of subaquatic communities, accompanying DOC formation, in the Lijiang River. The consumption of DIC and NO3 − by aquatic photosynthesis was in the ratio of 9:1 (mol/mol) to produce autochthono

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Author

Haijuan Zhao; Yongjun Jiang; Qiong Xiao; Cheng Zhang; Hamid M. Behzad

Publisher

Elsevier BV

Published

2021

Language

EN

Field

Environmental Science (Physical Sciences)