MODEL CDM OF MANGROVE FOREST: AN ESTIMATION OF NET CO2 FIXATION CAPACITY IN MANGROVE FOREST BY USING METHODS OF CO2 GAS EXCHANGE AND ALLOMETRIC METHOD

Munandar, Munandar and Suwignyo, Rujito Agus and Nose, Akihiro and Sarno, Sarno MODEL CDM OF MANGROVE FOREST: AN ESTIMATION OF NET CO2 FIXATION CAPACITY IN MANGROVE FOREST BY USING METHODS OF CO2 GAS EXCHANGE AND ALLOMETRIC METHOD. Proceeding International Seminar on Sustainable Biomass Production and Utilization Challenges and Oppurtunities (ISOMASS) August, 3-4, 2009. ISSN 978-979-18755-7-8

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Abstract

In many coastal areas of South-East Asia, attempts have been made to revive coastal ecosystem by initiating projects that encourage planting of mangrove trees. Compared to the terrestrial trees, mangrove trees possess a higher carbon fixation capacity. It becomes a very significant option for clean development mechanism (CDM) program. However, a reliable method to estimate net CO2 fixation capacity of mangrove trees has not been established. Acknowledging the above fact, in order to find a possibility of AR-CDM (A-forestation, Reforestation ? Clean Development Mechanism)with mangrove plantation, we decided to set up three estimation methods of net CO2 fixation capacity (NCFC) of the reforested mangrove forests in various part areas in Indonesia. These three methods were (1) CO2 gas exchange method, (2) growth curve method developed by direct biomass measurement and (3) growth curve method determined by allometric method. The results indicated that: (1) The planted mangrove forest in this area has large capacity of the CO2 fixation, therefore mangrove plantation has feasibility to promote a project with mangrove plantation for AR-CDM (A-forestation, Reforestation-Clean Development Mechanism), contributing of reducing global warming; (2) Based on the gas exchange analysis method, the NCFC value in 2, 4and 6 year-old R. apiculata forest was calculated to be 18.4, 70.1 and 48.6 tCO2 ha-1 yr-1 (12.5, 47.8 and 33.2 tCH2O ha-1 yr-1), respectively. With growth curve method from stand biomass in different stand ages and an assumed maximum stand biomass at climax stage, annual biomass accumulation in above-ground 2, 4 and 6 year-old R. apiculata forest were 14.7, 49.9 and 94.2 ton ha-1 yr-1, respectively, while with the growth curve of biomass measurement base on allometrics method, the net CO2 fixation capacity of 2, 4 and 6 year-old mangrove forest were 13,3; 10,3 and 7,2 ton ha-1 yr-1 , respectively; (3) It appears that the NCFC values in 2 and 4 year-old forests determined with the method of gas exchange (100%) using a portable photosynthesis measuring system (LI-6400, Li-Cor, USA). and growth curve developed by direct measurement (116%) were closely similar, while based on the growth curve developed by allometric method was very low (26%) and would be underestimated; (4) There was no significant difference in the capacity of CO2 fixation in between different stand densities. The maximum values of the net CO2 fixation capacity in the stand density of 6,000 and 1,500 stem/ha were 50.5 and 41.4 ton ha-1 yr-1 respectively; (5) With stand densities 6,000 and 1,500 stem/ha, the stand ages when stand biomass reaches the maximum value were observed at about 14, and 22 year-old, respectively, therefore at the age of 20 years, mangrove forest should be felled and re-planted, since the annual growth increment (or capacity of CO2 fixation) had already decreased; (6) Growth and biomass production of R. apiculata mangrove forest tended to be positively correlated with soil characteristic such as pH, phosphate nutrient content and soil fraction.

Item Type:	Article
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/10512

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