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Zhuo Hao, Yang Gao*, Mingzhen Ma, Sophie M. Green, Jing Wang, Xianwei Song, Jennifer A.J. Dungait, Penny J. Johnes, Bailian Xiong, Timothy A. Quine, Xiaomin Sun, Xuefa Wen, Nianpeng He
Research output: Contribution to journal › Article (Academic Journal) › peer-review
This study used carbon (C) isotope sourcing to determine transport processes of dissolved inorganic carbon (DIC) from the land surface to river catchments in Southwest China. Both nested karst watersheds investigated (Chenqi and Houzhai) are representative of typical karst landform environments (e.g., primary forest, secondary forest, and farmland). We measured DIC concentrations and the δ 13 C values of rainfall, river water, groundwater, soil, and plants. To do so, we used IsoSource (a Visual Basic program) to determine source partitioning over time (seasonal) and across the two nested watersheds. In 2017, the mean DIC concentration was 0.06 ± 0.03 mmol L −1 and the rainfall δ 13 C DIC value was −14.4‰ ±1.9‰. We found similar DIC concentrations in the surface and groundwater of both watersheds, ranging from 0.20 to 0.71 mmol L −1 (seasonal) and from −3.7‰ to −9.4‰ (δ 13 C DIC ) in the Chenqi catchment and from 0.33 to 0.60 mmol L −1 (seasonal) and from −10.3‰ to −6‰ (δ 13 C DIC ) in the Houzhai watershed. The average δ 13 C values of soil and local plants were −24.6 ± 1.4‰ and −28.9 ± 1.2‰ in the Chenqi catchment and −25.8 ± 0.9‰ and −27.2 ± 1.8‰ in Houzhai watershed, respectively. In addition, carbonate bedrock and groundwater were the main sources of surface water in the Chenqi and Houzhai nested watersheds, both being greater than 30%. Source percentages were ∼20% from atmospheric deposition and ∼10% from soil. Furthermore, HCO 3 − was the predominant form of DIC (pH values > 8), and the contribution rates of dissolved carbonate minerals (HCO 3 − ) were approximately 10.4% and 19.6% in the Chenqi catchment and the Houzhai watershed, respectively.
Original language | English |
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Pages (from-to) | 425-436 |
Number of pages | 12 |
Journal | Journal of Hydrology |
Volume | 571 |
Early online date | 14 Feb 2019 |
DOIs | |
Publication status | Published - 1 Apr 2019 |
Research output: Contribution to journal › Article (Academic Journal) › peer-review
Buss, H. L. (Principal Investigator), Johnes, P. J. (Co-Principal Investigator) & Evershed, R. P. (Co-Principal Investigator)
1/01/16 → 31/12/18
Project: Research