摘要
为研究辽河三角洲湿地的固碳能力,2010年5月在辽河三角洲双台子河口东侧的两个翅碱蓬湿地区域采取7个柱状样,通过对样品的化学分析测试,并利用210Pb测年法确定的沉积速率研究了土壤对碳的扣留速率,其结果表明：有机碳浓度分别与各营养元素浓度间有显著的正相关关系（p＜0.01）,指示沉积物中的有机物质对营养元素有很强的富集能力,同时营养元素促进植物的生长,从而影响土壤碳的加积速率.研究区总碳浓度范围为10.5～14.6 g/kg,其中约83％为有机碳,其相应的土壤对总碳和有机碳扣留速率分别为98.02～260.37 g/m2/a（均值171.84 g/m2/a）和81.17～229.98 g/m2/a（均值141.29 g/m2/a）.本研究区,土壤对碳的扣留速率主要受土壤的沉积速率控制,并与高程有显著的相关关系（p＜0.01）.土壤对碳扣留机制的研究有助于加深对全球碳循的理解.
Carbon storage or sequestration is important in studying the global carbon cycle and budget.To evaluate carbon accumulation rate of S.salsa marsh along the vegetation coverage gradient,the authors collected 7 core samples from Liaohe Delta in May,2010.The sediment accretion rate was calculated by 210Pb dating method.The laboratory analyses focused on water content,bulk density,nutrient contents,Mehiich Ⅲ] extractable nutrients and carbon concentration.Remarkably,carbon concentration is significantly related to nutrient contents （p＜0.01）,implying that organic matters can effectively accumulate nutrient elements and support the growth of wetland vegetation,which favors carbon sequestration in the wetland soils.The results showed that total carbon concentration,about 83％ of which is organic carbon,varies within 10.5-14.6 g/kg and carbon accumulation rates are in the ranges of 98.02-260.37 g/m2/a（for total carbon）and 81.17-229.98 g/m2/a （for organic carbon）respectively with the average accumulation rate of 171.84 g/m2/a for TC and 141.29 g/m2/a for Corg.Carbon accumulation rates are likely affected by sediment accretion rate which is significantly related to the elevation of each wetland （p＜0.01）.The implication is that not every wetland in different geological conditions and vegetation coverages is equally effective in sequestering carbon; it is important to address differences in wetland elevation,geological conditions and vegetation coverages when assessing the role of wetlands as carbon sinks in global carbon budgets.
出处
《中国地质》
CAS
CSCD
北大核心
2014年第2期648-657,共10页
Geology in China
基金
国土资源部公益性行业基金(201111023)
国家自然科学基金(41240022)
海洋地质保障工程项目(GZH201200503)
中国地质调查局地质大调查项目(1212010611402)联合资助
