摘要
As an important long-term terrestrial carbon sequestration mechanism, biogeochemical sequestration of carbon within phytoliths may play a significant role in the global carbon cycle and climate change. The aim of this study is to explore the potential of carbon bio-sequestration within phytoliths produced by wetland plants. The results show that the occluded carbon content of phytoliths in wetland plants ranges from 0.49% to 3.97%, with a CV (coefficient of variation) value of 810%. The data also indicate that the phytolith-occluded carbon (PhytOC) content of biomass for wetland plants depends not only on the phytolith content of biomass, but also the efficiency of carbon occlusion within phytoliths during plant growth in herb-dominated fens. The fluxes of carbon bio-sequestration within phytoliths of herb-dominated fen plants range from 0.003 to 0.077 t CO2 equivalents t-e-CO2ha-1a-1 . In China, 0.04×106 to 1.05×106t CO2 equivalents per year may be sequestrated in phytoliths of herbaceous-dominated fen plants. Globally, taking a fen area of 1.48×108 ha and the largest phytolith carbon biosequestration flux (0.077 t-e-CO 2 ha-1a-1 ) for herb-dominated fen plants, about 1.14×10 7 t CO 2 equivalents per year would have been sequestrated in phytoliths of fen plants. If other wetland plants have similar PhytOC production flux with herb-dominated fen plants (0.077 t-e-CO2ha-1a-1 ), about 4.39×10 7 t-e-CO2a-1 may be sequestrated in the phytoliths of world wetland plants. The data indicate that the management of wetland ecosystems (e.g. selection of plant species) to maximize the production of PhytOC have the potential to bio-sequestrate considerable quantities of atmospheric CO2 .
As an important long-term terrestrial carbon sequestration mechanism, biogeochemical sequestration of carbon within phytoliths may play a significant role in the global carbon cycle and climate change. The aim of this study is to explore the potential of carbon bio-sequestration within phytoliths produced by wetland plants. The results show that the occluded carbon content of phytoliths in wetland plants ranges from 0.49% to 3.97%, with a CV （coefficient of variation） value of 810%. The data also indicate that the phytolith-occluded carbon （PhytOC） content of biomass for wetland plants depends not only on the phytolith content of biomass, but also the efficiency of carbon occlusion within phytoliths during plant growth in herb-dominated fens. The fluxes of carbon bio-sequestration within phytoliths of herb-dominated fen plants range from 0.003 to 0.077 t CO2 equivalents t-e-CO2 ha^-1 a^-1. In China, 0.04x10^6 to 1.05×10^6 t CO2 equivalents per year may be sequestrated in phytoliths of herbaceous-dominated fen plants. Globally, taking a fen area of 1.48×10^8 ha and the largest phytolith carbon biosequestration flux （0.077 t-e-CO2 ha^-1 a^-1） for herb-dominated fen plants, about 1.14× 10^7 t CO2 equivalents per year would have been sequestrated in phytoliths of fen plants. If other wetland plants have similar PhytOC production flux with herb-dominated fen plants （0.077 t-e-CO2 ha^-1 a^-l）, about 4.39×10^7 t-e-CO2 a^-1 may be sequestrated in the phytoliths of world wetland plants. The data indicate that the management of wetland ecosystems （e.g. selection of plant species） to maximize the production of PhytOC have the potential to bio-sequestrate considerable quantities of atmospheric CO2.
基金
supported by the National Natural Science Foundation of China (41103042)
Zhejiang Provincial Key Science and Technology Innovation Team (2010R50030)
Zhejiang Provincial Natural Science Foundation Program (Y5080110 and Z5080203)
the Opening Project of State Key Laboratory of Environmental Geochemistry (SKLEG9011)
the Opening Project of Ministry of Education Laboratory for Earth Surface Processes, Peking University (201106)
