

FOLLOWUS
1.South China Sea Institute of Oceanology, Chinese Academy of Sciences, CAS Key Laboratory of Tropical Marine Bio-resources and Ecology; Guangdong Provincial Key Laboratory of Applied Marine Biology, Guangzhou 510301, China
2.South China Sea Marine Survey Center, Ministry of Natural Resources, Guangzhou 510300, China
3.CAS-HKUST Sanya Joint Laboratory of Marine Science Research, Key Laboratory of Tropical Marine Biotechnology of Hainan Province, Sanya Institute of Ocean Eco-Environmental Engineering, Sanya 572000, China
4.Sanya National Marine Ecosystem Research Station; Tropical Marine Biological Research Station in Hainan, Chinese Academy of Sciences, Sanya 572000, China
5.University of Chinese Academy of Sciences, Beijing 100049, China
6.Key Laboratory of Marine Environmental Survey Technology and Application, Ministry of Natural Resources, Guangzhou 510300, China
7.Guangdong Center for Marine Development Research, Guangzhou 510220, China
huanghui@scsio.ac.cn
Received:20 March 2024,
Online First:26 May 2024,
Published:01 May 2025
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ZHANG Junxiao,HUANG Hui,YUAN Xiangcheng,et al.The dilemma of Luhuitou fringing reefs: net dissolution in winter and enhanced acidification in summer[J].Journal of Oceanology and Limnology,2025,43(03):785-802.
ZHANG Junxiao,HUANG Hui,YUAN Xiangcheng,et al.The dilemma of Luhuitou fringing reefs: net dissolution in winter and enhanced acidification in summer[J].Journal of Oceanology and Limnology,2025,43(03):785-802. DOI: 10.1007/s00343-024-4088-7.
Global coral reef ecosystems have been severely degraded due to the combined effects of climate change and human activities. Changes in the seawater carbonate system of coral reef ecosystems can reflect their status and their responses to the impacts of climate change and human activities. Winter and summer surveys in 2019 found that the ecological community of the Luhuitou coral reef flat was dominated by macroalgae and corals
respectively
contrasting with the conditions 10 years ago. The Luhuitou fringing reefs were sources of atmospheric CO
2
in both seasons. In winter
the daily variation range of dissolved inorganic carbon (DIC) in Luhuitou coral reefs was up to 450 μmol/kg
while that of total alkalinity (TA) was only 68 μmol/kg. This indicated that the organic production was significantly higher than the calcification process during this period. The TA/DIC was approximately 0.15
which was less than half of that in healthy coral reefs; hence
photosynthesis-respiration processes were the most important factors controlling daily changes in the seawater carbonate system. The net community production (NCP) of the Luhuitou coral reef ecosystem in winter was as high as 47.65 mmol C/(m
2
·h). While the net community calcification (NCC) was approximately 3.35 and -4.15 mmol CaCO
3
/(m
2
·h) during the daytime and nighttime respectively. Therefore
the NCC for the entire day was -21.9 mmol CaCO
3
/(m
2
·d)
indicating a net autotrophic dissolved state. In summer
the acidification was enhanced by thunderstorms
and heavy rain with the highest seawater partial pressure of CO
2
(
p
CO
2
) and lowest pH
T
. Over the past 10 years
the increase rate of seawater
p
CO
2
in Luhuitou reef was approximately 13.3 μatm/a
***
six times that of the open ocean
while the decrease rate of pH was approximately 0.008 3/a
being five times that of the global ocean. These findings underscore the importance of protecting and restoring Luhuitou fringing reef
as well as similar reefs worldwide.
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