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Biodegradable and Seasonal Variation of Organic Carbon Affected by Anthropogenic Activity: A Case in Xuan Thuy Mangrove Forest, North Vietnam
Water (Switzerland) Số 5, năm 2022 (Tập 14, trang -)
ISSN: 20734441
ISSN: 20734441
DOI:
Tài liệu thuộc danh mục:
Article
English
Từ khóa: Viet Nam; Aquaculture; Chlorine compounds; Drought; Forestry; Molar ratio; Anthropogenic activity; Biodegradable; Deforested; Dry seasons; Mangrove forest; Mean percentage; Rainy seasons; Re-suspension; Seasonal variation; Viet Nam; aquaculture; human activity; mangrove; organic carbon; resuspension; seasonal variation; Organic carbon
Tóm tắt tiếng anh
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. © 2022 by the authors. Licensee MDPI, Basel, Switzerland.