摘要:
通过2008-2011年连续现场采样和室内实验分析,研究了乌梁素海沉积物营养盐的分布特征以及固碳功能.结果发现,乌梁素海沉积物中氮与有机碳水平分布具有相同规律,总磷水平分布差异较大,揭示了沉积环境和水动力条件对磷在沉积物中的累积具有一定影响,也在一定程度上反映了磷来源的多样性.在垂直方向上,总氮、有机碳、硝态氮规律明显,随深度增加有递减的趋势,而总磷和氨氮垂直分布差异性显著,表明其与环境因素和早期演化和成岩作用有关.乌梁素海沉积物中C:N:P=20.2:4.5:1,小于Redfield比(C:N:P=106:16:1).沉积物中总氮与有机碳有明显的正相关性,而总磷与有机碳无相关性.乌梁素海沉积物有机碳沉积速率为169.55 gm-2a-1,有机碳密度为5.70 kgm-2.30 cm深度沉积物中,碳储量为134.39104t,存在很大的固碳潜力,这对于调节气候变化和维护湖泊区域生态平衡具有重要潜能.
Abstract:
Based on the on-site sampling and laboratory experiments from 2008 to 2011, this paper studied the characteristics of the nutrients distribution in the Ulansuhai Lake sediment, as well as carbon sequestration. The results showed that the horizontal distribution of nitrogen and organic carbon has same regularity. The horizontal distribution of the total phosphorus varied largely, which reveals the impacts of the sedimentary environment and hydrodynamic conditions to the accumulation of the phosphorus in the sediments, and the diversity phosphorus source. Total nitrogen, organic carbon and nitrate-nitrogen decreased with increasing depth of sediment in the vertical direction. The vertical distribution of total phosphorus and ammonia nitrogen varied significantly, which is related to the environmental factors and the early development of the sediment. C:N:P ratios of surface sediments is 20.2:4.5:1, lower than Redfield ratios. Organic carbon and nitrogen have obvious positive correlation. Organic carbon deposition rate in the sediment of Ulansuhai Lake is 169.55 gCm-2a-1.Organic carbon density is 5.70 kgm-2, and carbon stored in 30 cm depth of the sediments is 134.39104 t, which has a great potential for carbon sequestration and climate regulation as well as ecological balance of lake region.
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