Li Beilei, Song Zhaoliang, Li Zimin, Wang Hailong, Gui Renyi, Song Ruisheng
School of Environment and Resources, Zhejiang Agricultural and Forestry University, Lin'an, Zhejiang 311300, China.
1] School of Environment and Resources, Zhejiang Agricultural and Forestry University, Lin'an, Zhejiang 311300, China [2] State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guizhou, P.R. China.
Sci Rep. 2014 Apr 16;4:4710. doi: 10.1038/srep04710.
Phytoliths, the amorphous silica deposited in plant tissues, can occlude organic carbon (phytolith-occluded carbon, PhytOC) during their formation and play a significant role in the global carbon balance. This study explored phylogenetic variation of phytolith carbon sequestration in bamboos. The phytolith content in bamboo varied substantially from 4.28% to 16.42%, with the highest content in Sasa and the lowest in Chimonobambusa, Indocalamus and Acidosasa. The mean PhytOC production flux and rate in China's bamboo forests were 62.83 kg CO2 ha(-1) y(-1) and 4.5 × 10(8)kg CO2 y(-1), respectively. This implies that 1.4 × 10(9) kg CO2 would be sequestered in world's bamboo phytoliths because the global bamboo distribution area is about three to four times higher than China's bamboo. Therefore, both increasing the bamboo area and selecting high phytolith-content bamboo species would increase the sequestration of atmospheric CO2 within bamboo phytoliths.
植硅体是沉积在植物组织中的无定形二氧化硅，在其形成过程中能够固定有机碳（植硅体碳，PhytOC），并在全球碳平衡中发挥重要作用。本研究探讨了竹子中植硅体碳固存的系统发育变异。竹子中的植硅体含量差异很大，从4.28%到16.42%不等，其中赤竹属含量最高，寒竹属、箬竹属和酸竹属含量最低。中国竹林中PhytOC的平均产生通量和速率分别为62.83 kg CO2 ha(-1) y(-1)和4.5×10(8)kg CO2 y(-1)。这意味着全球竹子的分布面积约为中国竹子的三到四倍，因此全球竹子植硅体中将固存1.4×10(9) kg CO2。因此，增加竹林面积和选择植硅体含量高的竹种都将增加大气CO2在竹子植硅体中的固存。
