Sources of organic carbon and environmental response characteristics in the mangrove region of Trat Province, Thailand, over the past 1,019 years
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View abstract on PubMed
Summary
This summary is machine-generated.Mangrove ecosystems store significant organic carbon. This study reveals how terrestrial, oceanic, and mangrove sources contributed to carbon in Thai sediments over time, influenced by sea-level rise and monsoon patterns.
Area Of Science
- Marine Geology and Geochemistry
- Coastal Ecosystem Dynamics
- Paleoclimatology
Background
- Mangrove ecosystems are crucial carbon sinks, vital for mitigating climate change.
- Understanding organic carbon sources in mangrove sediments informs historical climate change impacts and future vulnerability.
- Assessing mangrove adaptive capacity requires knowledge of their environmental response mechanisms.
Purpose Of The Study
- To quantitatively determine the contributions of terrestrial, mangrove-derived, and oceanic organic carbon (OC) in mangrove sediments.
- To analyze the environmental factors influencing organic carbon sources and mangrove development in Trat Province, Thailand.
- To provide a scientific basis for mangrove conservation strategies.
Main Methods
- Analysis of sediment cores (Tm) from Trat Province, Thailand.
- Measurement of total organic carbon (TOC), total nitrogen (TN), and stable carbon isotopes (δ<sup>13</sup>C).
- Application of an end-member mixing model to calculate OC source contributions.
Main Results
- Two distinct stages of OC sources were identified: Tm1 (non-mangrove, ~1019-174 cal yr BP) with dominant terrestrial and oceanic OC, and Tm2 (mangrove, ~174-0 cal yr BP) with dominant terrestrial and mangrove-derived OC.
- During Tm1, high sedimentation rates (SR) exceeded relative sea level (RSL) rise, favoring seaward progradation.
- During Tm2, accelerated RSL rise created favorable conditions for sustained mangrove development, influenced by temperature and precipitation via the Asian Summer Monsoon (ASM).
Conclusions
- Sediment composition shifted from terrestrial/oceanic to include significant mangrove-derived OC with the establishment of the mangrove environment.
- Relative sea level rise and sedimentation rates are key drivers of mangrove ecosystem development and carbon cycling.
- Mangrove growth in this region is primarily controlled by monsoon-driven climate patterns due to weak hydrological influences.
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