Okimoto, Yosuke and Nose, Akihiro and Suwignyo, Rujito Agus and Ulqodry, T. Zia and Oba, Y and Tateda, Y (2013) Estimation of CO2 fixation capacity and growth potential on mangrove forest in South East Asia. In: Mainstreaming Mangroves. Ministry of Forestry, Republic of Indonesia, Jakarta. ISBN 978-979-606-097-9
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Abstract
Carbon pools of mangrove forests are among the highest of tropical forest types (Bouillon et al., 2008). Of great interest is the mangroves? potential value in carbon mitigation programs, such as REDD+ and other financial incentives tied to conservation of standing forests (Kauffman and Donato, 2012). Carbon stocks of mangrove forest have being estimated with allometric equations. Although some of them are approved in UNFCCC for AR-CDM as default ones for estimating above-ground biomass (e.g. Putz and Chan, 1986; Clough and Scott, 1989; Chave et al. 2005), the allometric method is laborious and time consuming (Clough, 1997). We have challenged to develop alternative methodologies and proposed both analysis methods of gas exchange and growth curve (Okimoto et al., 2007, 2008). The former derives CO2 balance of photosynthetic absorption and respiratory emission of CO2. They are based on measurements of photosynthesis in leaf and respiration in each organ such as leaf, branch, trunk and root. Accuracy in the estimation has being acquired by involving models of daily and monthly variation in both light intensity and temperature for the above-ground CO2 balance and corrections of root respiration in response to low oxygen concentrations. Meanwhile, the latter gives stand biomass variations over the time. The growth curve is determined with three elements; a few of different-aged stand biomass, a coefficient of the growth curve and an assumed maximum stand biomass. According to our results in South-East Asia, above-ground biomass increment of the gas exchange estimations were 66.0 ton ha-1 yr-1 for 7 year-old Kandelia candel forest in Nam Dinh, Vietnam (21? North latitude), 34.3 ton ha-1 yr-1 for 10 year-old K. candel forest in Thanh Hoa, Vietnam (19? N) and 76.3 ton ha-1 yr-1 for 9 year-old Rhizophora apiculata forest in Trat, Thailand (12? N), respectively (Fig.1.). Based on the results and our field observation that those forests are already matured even at their 15 year-old, maximum growth potential of the K. candel forests in Nam Dinh and Thanh Hoa is estimated as 265 and 305 ton/ha, respectively. Consequently, it is expected that the mangrove monoculture forests in around 20? N (the North Vietnam) have a growth potential up to around 300 ton/ha. In a similar way, some data for 8-10 year-old R. apiculata forest in Sungai Asam, Indonesia (2? S) is under analysis. They will be combined with the data for R. apiculata in Trat mentioned above to figure out the growth potential in the equatorial areas.
| Item Type: | Book Section |
|---|---|
| Subjects: | S Agriculture > S Agriculture (General) > S1-(972) Agriculture (General) |
| Divisions: | 05-Faculty of Agriculture > 54204-Agronomy (Agricultural Sciences) (S1) |
| Depositing User: | Dr. Rujito Agus Suwignyo |
| Date Deposited: | 10 Oct 2019 02:48 |
| Last Modified: | 10 Oct 2019 02:48 |
| URI: | http://repository.unsri.ac.id/id/eprint/10489 |
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