碩士 / 國立臺灣海洋大學 / 海洋事務與資源管理研究所 / 98 / The main reason for the global warming over the past century is the excessive emission of greenhouse gases, among which CO2 plays the major role. Among the proposed solutions to lessen global warming, either by technical ways to reduce carbon footprints and implement carbon capture and storage (CCS) or by social and legal means to constrain CO2 emission becomes indispensable.
This study gathered information about global warming from various sources, identified and reexamined major carbon source and carbon sink, and updated the estimation of carbon budget in the atmosphere and ocean. Furthermore, we analyzed shell and calcium carbonate composition of four economic bivalves, oyster, hard clam, blue mussel and freshwater clam. Together with fishery statistics from Food and Agriculture Organization of the United Nations and Taiwan Fisheries Yearbook, we evaluated the capacity of carbon sequestration capacity from bivalve aquaculture, compared that with carbon sink capacity from forests, calcification capacity of other calcifying organism and concluded its feasibility to reduce CO2 in atmosphere.
Literature review and synopsis indicated yearly CO2 increment in atmosphere is 4.67 Gt C, after the deduction from absorption by ocean and terrestrial ecosystem. The estimation from experiment and fishery statistics showed that global carbon sequestration capacity from bivalve culture would be 225,200, 182,000, 78,800 and 2436 tC for oyster, clam, mussel, and freshwater clam, respectively. When other bivalves were included, total CO2 sequestrated would be 530,000 tC, or 0.0113% of the CO2 increment in the atmosphere. This amount is equivalent to 11 million hectares’ restoration of forest. From bivalve aquaculture statistics in Taiwan, we estimated the carbon sequestration capacity be 0.126, 0.256, and 0.712 tC ha-1yr-1 for oyster, clam, and freshwater clam, respectively, of which the last one is even higher than that for forest, 0.479 tC ha-1yr-1. While carbon sequestration and its accumulation in forest is limited by area, biomass containment and ecological succession, no such constraints applied on bivalve aquaculture. Although the carbon sequestration capacity of coral ecosystem (1.8 tC ha-1yr-1) is higher than that of bivalve aquaculture, coral is fragile to global warming and ocean acidification and hard to restore and recover its ecosystem. On the contrary, global bivalve aquaculture production for the past 50 years only showed increasing trend, unaffected by global climate change. This further demonstrates the biological superiority of bivalve aquaculture for carbon sequestration. Moreover, bivalve aquaculture per se is economically valid, no extra cost is necessary to pay for carbon sequestration, and along its production carbon credit is earned. Therefore, for the aforementioned multi-benefits, bivalve aquaculture should be attractive for the investors and promoted for carbon sequestration.
| Identifer | oai:union.ndltd.org:TW/098NTOU5277007 |
| Date | January 2010 |
| Creators | Chun-Hong Chen, 陳俊宏 |
| Contributors | Yew-Hu Chien, Kwang-Ming Liu, 陳瑤湖, 劉光明 |
| Source Sets | National Digital Library of Theses and Dissertations in Taiwan |
| Language | zh-TW |
| Detected Language | English |
| Type | 學位論文 ; thesis |
| Format | 100 |
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