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植硅体碳(phytolith-occluded organic carbon,PhytOC)具有很强的抗风化能力,能存在于土壤中达数千年之久,成为陆地土壤长期固碳的重要机制。论文以中国亚热带地区苦竹(Pleioblastus amarus)林生态系统为对象,探究硅、植硅体及植硅体碳在竹林生态系统中的分布特征。研究结果表明,植硅体碳广泛分布于苦竹地上部分各器官中,植硅体和植硅体碳含量均为叶>枝>秆。被传统植硅体研究所忽略的竹枝和竹秆中的植硅体碳储量占到地上部分植硅体碳总储量的7.2%和51.1%。植硅体碳占总有机碳的比例在叶、枝、秆中分别为0.59%、0.21%和0.28%,植硅体碳占总有机碳的比例因积累器官的不同而存在明显的差异。植物体内植硅体的含量与土壤中植物可利用硅的含量之间存在显著的线性相关关系(R2=0.91,P<0.05),而与土壤中总硅无相关性(R2=0.16,P>0.05)。苦竹林植硅体碳封存速率为40.2 kg·hm-2·a-1。
PhytOC has strong anti-weathering ability and can exist in the soil for thousands of years, and becomes an important mechanism of long-term carbon sequestration on terrestrial soils. In this paper, the Pleioblastus amarus forest ecosystem in the subtropical region of China was studied to investigate the distribution characteristics of silicon, phytoliths and phytolith carbon in bamboo forest ecosystems. The results show that the phytolith carbon is widely distributed in the organs of the aerial part of Pleurotus ostreatus, and the carbon content of phytolith and phytolith is leaf> branch> stalk. Phytolith carbon stocks in bamboo branches and bamboo stalks ignored by the traditional phytolith Institute account for 7.2% and 51.1% of the total phytolith carbon stocks on the aboveground part. The proportion of phytolith carbon in total organic carbon was 0.59%, 0.21% and 0.28% respectively in leaves, branches and stems. There was a significant difference in the proportion of phytolith carbon to total organic carbon due to the accumulation of organs. There was a significant linear correlation between plant phytoliths content and available silicon in soil (R2 = 0.91, P <0.05), but not with total silicon in soil (R2 = 0.16, P> 0.05). The carbon sequestration rate of bitter bamboo plant was 40.2 kg · hm-2 · a-1.