Biodegradable and Seasonal Variation of Organic Carbon Affected by Anthropogenic Activity: A Case in Xuan Thuy Mangrove Forest, North Vietnam

The samples were collected from different areas (from natural, planted, and deforested mangrove forests) to study the impact of anthropogenic activity on biodegradable and seasonal variation of organic carbon (OC) in Xuan Thuy mangrove forest, North Vietnam. We observed a positive relationship betwe...

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Bibliographic Details
Published in:Water (Basel) 2022-03, Vol.14 (5), p.773
Main Authors: Nguyen, Thi Mai Huong, Le, Thi Phuong Quynh, Hoang, Vinh Van, Vu, Cam Tu
Format: Article
Language:English
Subjects:
Agricultural production
Anthropogenic factors
Aquaculture
Aquaculture industry
Biodegradability
Biodegradation
Carbon
Climate change
Deforestation
Dissolved organic carbon
Dry season
Ecosystems
Forests
Human influences
International economic relations
Laboratories
Mangrove swamps
Mangroves
National parks
Nitrogen
Organic carbon
Organic matter
Rainy season
Seasonal variations
Seasons
Terrestrial environments
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Summary:The samples were collected from different areas (from natural, planted, and deforested mangrove forests) to study the impact of anthropogenic activity on biodegradable and seasonal variation of organic carbon (OC) in Xuan Thuy mangrove forest, North Vietnam. We observed a positive relationship between TSS and both POC and DOC (r2 = 0.993; p < 0.0001 và r2 = 0.942; p < 0.0001, respectively), suggesting that erosion and resuspension increase OC delivery at the mangroves. Mean DOC and POC concentrations in the rainy season (4.8 ± 3.0 mgCL−1 and 6.9 ± 1.6 mgCL−1, respectively) were significantly higher than those in the dry season (3.1 ± 0.9 mgCL−1 and 2.9 ± 0.4 mgCL−1, respectively). The mean percentage of biodegradable for 40 days was about 47 ± 15% of BTOC, 45 ± 17% of BDOC, and 48 ± 18% of BPOC. The rainy season indicated that there was more biodegradable OM in the mangroves compared to the dry season. The molar ratio of OC and total nitrogen was from 0.4 to 25.9, showing a hybrid of terrestrial organic matter and aquatic. Lower C/N and great variation of POC/Chla in the deforested mangroves was due to augmented OM input from aquaculture activities in this area. The results of this study indicate that deforested mangrove and an increase in aquaculture activities will contribute to anthropogenic OM reaching the sea.
ISSN:2073-4441
2073-4441
DOI:10.3390/w14050773