Cascading multiscale watershed effects on differential carbon isotopic characteristics and associated hydrological processes

Yang Gao; Junjie Jia; Y Lu; F Zhou; Z Hao; Penny J Johnes; Jenni A J Dungait; K Shi

doi:10.1016/j.jhydrol.2020.125139

Cascading multiscale watershed effects on differential carbon isotopic characteristics and associated hydrological processes

Yang Gao^*, Junjie Jia, Y Lu, F Zhou, Z Hao, Penny J Johnes, Jenni A J Dungait, K Shi

^*Corresponding author for this work

Research output: Contribution to journal › Article (Academic Journal)

Abstract

Understanding land-use change accompanied by anthropogenic activities under alterations in watershed size regulations or differential carbon (C) isotope characteristics remain a challenge in C cycling research. In this study, we investigate changes in the export of C composition and its isotopic characteristics at multiple scales in a subtropical cascading watershed in China. Results show that C concentrations in rainfall and dissolved total carbon (DTC), dissolved organic carbon (DOC) and δ13C in runoff seasonally fluctuate at a temporal scale. On average, the δ13C from silicate rock weathering was 31–32%, contributing the largest amount of δ13C in the different watersheds. Moreover, the contribution of isotopic composition from atmospheric deposition to the δ13C fraction increased as watershed size increased, while the corresponding contribution from soil organic matter (SOM) decomposition decreased. On the other hand, anthropogenic activities play a dominant role in the isotopic composition of large watersheds. In addition, the correlation coefficient between C transport via runoff and the δ18O value in rainfall increased as watershed size increased. This indicated that as a source rainfall had an obvious influence on C transport in runoff according to proportional values measured in event
and pre-event water.

Original language	English
Article number	125139
Number of pages	11
Journal	Journal of Hydrology
Volume	588
Early online date	3 Jun 2020
DOIs	https://doi.org/10.1016/j.jhydrol.2020.125139
Publication status	Published - 1 Sep 2020

Keywords

C transport
13C
watershed
scale effect
hydrological process

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Gao, Y., Jia, J., Lu, Y., Zhou, F., Hao, Z., Johnes, P. J., Dungait, J. A. J., & Shi, K. (2020). Cascading multiscale watershed effects on differential carbon isotopic characteristics and associated hydrological processes. Journal of Hydrology, 588, [125139]. https://doi.org/10.1016/j.jhydrol.2020.125139

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title = "Cascading multiscale watershed effects on differential carbon isotopic characteristics and associated hydrological processes",

abstract = "Understanding land-use change accompanied by anthropogenic activities under alterations in watershed size regulations or differential carbon (C) isotope characteristics remain a challenge in C cycling research. In this study, we investigate changes in the export of C composition and its isotopic characteristics at multiple scales in a subtropical cascading watershed in China. Results show that C concentrations in rainfall and dissolved total carbon (DTC), dissolved organic carbon (DOC) and δ13C in runoff seasonally fluctuate at a temporal scale. On average, the δ13C from silicate rock weathering was 31–32%, contributing the largest amount of δ13C in the different watersheds. Moreover, the contribution of isotopic composition from atmospheric deposition to the δ13C fraction increased as watershed size increased, while the corresponding contribution from soil organic matter (SOM) decomposition decreased. On the other hand, anthropogenic activities play a dominant role in the isotopic composition of large watersheds. In addition, the correlation coefficient between C transport via runoff and the δ18O value in rainfall increased as watershed size increased. This indicated that as a source rainfall had an obvious influence on C transport in runoff according to proportional values measured in event and pre-event water. ",

keywords = "C transport, 13C, watershed, scale effect, hydrological process",

author = "Yang Gao and Junjie Jia and Y Lu and F Zhou and Z Hao and Johnes, {Penny J} and Dungait, {Jenni A J} and K Shi",

year = "2020",

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doi = "10.1016/j.jhydrol.2020.125139",

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T1 - Cascading multiscale watershed effects on differential carbon isotopic characteristics and associated hydrological processes

AU - Gao, Yang

AU - Jia, Junjie

AU - Lu, Y

AU - Zhou, F

AU - Hao, Z

AU - Johnes, Penny J

AU - Dungait, Jenni A J

AU - Shi, K

PY - 2020/9/1

Y1 - 2020/9/1

N2 - Understanding land-use change accompanied by anthropogenic activities under alterations in watershed size regulations or differential carbon (C) isotope characteristics remain a challenge in C cycling research. In this study, we investigate changes in the export of C composition and its isotopic characteristics at multiple scales in a subtropical cascading watershed in China. Results show that C concentrations in rainfall and dissolved total carbon (DTC), dissolved organic carbon (DOC) and δ13C in runoff seasonally fluctuate at a temporal scale. On average, the δ13C from silicate rock weathering was 31–32%, contributing the largest amount of δ13C in the different watersheds. Moreover, the contribution of isotopic composition from atmospheric deposition to the δ13C fraction increased as watershed size increased, while the corresponding contribution from soil organic matter (SOM) decomposition decreased. On the other hand, anthropogenic activities play a dominant role in the isotopic composition of large watersheds. In addition, the correlation coefficient between C transport via runoff and the δ18O value in rainfall increased as watershed size increased. This indicated that as a source rainfall had an obvious influence on C transport in runoff according to proportional values measured in event and pre-event water.

AB - Understanding land-use change accompanied by anthropogenic activities under alterations in watershed size regulations or differential carbon (C) isotope characteristics remain a challenge in C cycling research. In this study, we investigate changes in the export of C composition and its isotopic characteristics at multiple scales in a subtropical cascading watershed in China. Results show that C concentrations in rainfall and dissolved total carbon (DTC), dissolved organic carbon (DOC) and δ13C in runoff seasonally fluctuate at a temporal scale. On average, the δ13C from silicate rock weathering was 31–32%, contributing the largest amount of δ13C in the different watersheds. Moreover, the contribution of isotopic composition from atmospheric deposition to the δ13C fraction increased as watershed size increased, while the corresponding contribution from soil organic matter (SOM) decomposition decreased. On the other hand, anthropogenic activities play a dominant role in the isotopic composition of large watersheds. In addition, the correlation coefficient between C transport via runoff and the δ18O value in rainfall increased as watershed size increased. This indicated that as a source rainfall had an obvious influence on C transport in runoff according to proportional values measured in event and pre-event water.

KW - C transport

KW - 13C

KW - watershed

KW - scale effect

KW - hydrological process

U2 - 10.1016/j.jhydrol.2020.125139

DO - 10.1016/j.jhydrol.2020.125139

M3 - Article (Academic Journal)

VL - 588

JO - Journal of Hydrology

JF - Journal of Hydrology

SN - 0022-1694

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