Ability of mangroves to fix atmospheric greenhouse gaz: Case study in Can Gio mangrove, Viet Nam
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Presented by Trương Văn Vinh on 9 November 2020 at "National workshop: Mangrove environmental services payments"
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Ability of mangroves to fix atmospheric greenhouse gaz: Case study in Can Gio mangrove, Viet Nam
- 1. Khả năng cố định khí nhà kính của rừng ngập mặn: Nghiên cứu tại rừng ngập mặn Cần Giờ Ability of mangroves to fix atmospheric greenhouse gaz: Case study in Can Gio mangrove, Viet Nam Trương Văn Vinh Khoa Lâm Nghiệp, Trường Đại học Nông Lâm – TP. HCM 1 TP. HCM, ngày 09/11/2020 Email: tvvinh@hcmuaf.edu.vn; ĐT: 0989352208
- 4. ~57 % area 1964 - 1969 665,666 gallons of Agent Orange 343,385 gallons of Agent White 49,200 gallons of Agent Blue since 1978 ~21,000 ha since 1978 ~21,000 ha ~ 32,125 ha 77 mangrove species 35 true mangroves 42 associates Nowadays 4
- 5. 5
- 6. Mudflat Fringe forest Transition forest Inner forest 118.8 91.7 24.3 150.2157.6118.6 61.9 241.8 157.9 Ecosystem carbon stock 150.2 (Mg C ha-1) 181.9 (Mg C ha-1) 311.5 (Mg C ha-1) 479.2 (Mg C ha-1)
- 7. Buried dead trunk of Rhizophora 40 cm Soil surface - MacKenzie et al., (2016) tỷ lệ bồi lắng trung bình: ~0.99 ± 0.09 cm yr-1 7
- 8. Total mangrove forest cover 32 126 ha Mudflat 1 413 ha Mix forest 8 617 ha Rhizophora forest 23 508 ha The overall carbon stock of Can Gio ~13.6 Tg C 8
- 11. 11 168 mmol CO2m-2d-1 78 mmol CO2m-2d-1 Triều cao 266 mmol CO2m-2d-1 Triều thấp - 168.5 (Lovelock et al., 2014) - 88.6 (Lang’at et al., 2014) - 80.5 (Leopold et al., 2014) - 65.5 (Grellier et al., 2014)
- 12. 12
- 13. 13 Vertical CO2 concentrations profiles in the canopy Heightaboveground(m)
- 14. 14 Eddy-Covariance System on river
- 15. 15 Eddy-Covariance System in Rhizophora forest
- 16. 16
- 17. 17 January February March April May DecemberNovemberOctober AugustJulyJune September Observation data in 5 years (2016 – 2020)
- 18. 18 T0C H (%) Net Ecosystem Exchange (μmolm-2s-1)
- 19. 19 Net Ecosystem Exchange CO2
- 20. 20 Net Ecosystem Exchange CO2 2/6/2017 16/6/2017
- 21. 21 Daily sum of Net Ecosystem Exchange CO2 (gram Carbon/m2/day)
- 22. 22(Leopold 2016) Where is the Net Ecosystem Production (NEP) of Can Gio Mangrove Forest, Tropical, planted mangrove (Rhizophora)???
- 23. 23 Xin chân thành cảm ơn! CHƯƠNG TRÌNH TRỒNG RỪNG NGẬP MẶN TẠI TX. VĨNH CHÂU, SÓC TRĂNG (2020 -2028)
Notas do Editor
- Our main objectives were to quantify the seasonal variability of the litterfall of these two species and to determine their decay rates on the forest floor. We were also interested in nutrient releases during decomposition processes, as well as the evolution of the δ13C values and the content of some trace metals.
- Because of GHG increase in the atmosphere, the earth’s climate has warmed by approximately 0.6°C over the past 100 years with two main periods of warming
- geographical distribution of mangroves in Vietnam can divided into 4 zones and 12 subzones
- During the war (1964 – 1969), most of these forests were destroyed by the spraying of defoliants, particularly in Can Gio, where ~57 % of mangrove areas were destroyed Fortunately, these areas were subsequently reforested since 1978 Nowadays, Can Gio mangrove forest area covers approximately 32,125 ha of mangrove forests including 23,508 ha of interior forest and 8,617 ha of mixed forest
- the soil carbon stocks were significantly different between the different stands soil carbon stocks increased with the elevation gradient, with higher values in the inner forest
- - The reforestation program started in 1978 (Hong and San, 1993) - MacKenzie et al., (2016) determined an average vertical accretion rate of around 0.99 cm yr-1
- CO2 concentrations were higher in the daytime at low tide than in the daytime at high tide. This result may be related to the higher CO2 emmission from soil at low tide than CO2 emmission from water column at high tide. The highest CO2 concentrations were determine at night in May, which related to the period of highest CO2 emissions from soils and trunks due to the high temperature and beginning of the rainy season.