达里诺尔湖沉积物中无机碳的形态组成  

Forms composition of inorganic carbon in sediments from Dali Lake

作　　者：孙园园[1] 何江[1,2] 吕昌伟[1,2] 王维[1,2] 樊明德[1,2] 任丽敏[1] 麻涛[1] 

机构地区：[1]内蒙古大学环境与资源学院,呼和浩特010021 [2]内蒙古大学环境地质研究所,呼和浩特010021

出　　处：《生态学报》2013年第2期610-618,共9页Acta Ecologica Sinica

基　　金：国家自然科学基金(40863003);内蒙古科技厅科技引导创新项目(210058);内蒙古大学"科技创新团队"基金(12110619)

摘　　要：以达里诺尔湖沉积物为研究对象,运用连续浸取法分析测定了沉积物中不同形态的无机碳,开展了沉积物中无机碳形态的分布特征研究,初步探讨了沉积物中不同形态生源要素与无机碳的相互关系。研究表明,表层和柱芯沉积物中无机碳的主导形态均为NH2OH.HCl相;空间分布上,湖心区为各形态无机碳的高值区,东部和北部湖区为低值区;计算结果表明,碳酸钙在湖水中可达过饱和,揭示达里诺尔湖具备形成自生碳酸盐沉淀的条件;沉积柱芯中氮、磷和生物硅与无机碳的相互关系反映了营养水平升高可促进水体对碳酸钙过饱和条件的形成,藻类光合作用对水体理化性质的改变是导致碳酸盐沉淀的重要因素之一。Sediments play an important role in carbon cycle as the important sources and sinks of carbon.The role of sediments in the carbon cycle is closely related to the forms and distribution of inorganic carbon in the sediments.The forms of inorganic carbon have different capacity in the carbon cycle and recycle.Forms and changes of inorganic carbon in the sediments were essential for the fluxes and processes of carbon across the water-sediment interface.The study of inorganic carbon forms is the basis and premise for discussing their contribution to carbon cycling.In this wok,the sequential extraction method was employed to extract inorganic carbon forms in sediments from Dali Lake.The form distribution characters of inorganic carbon in surface sediments and sediment cores were studied.The correlations between inorganic carbon and physical-chemistry characteristics such as total organic carbon（TOC）,total nitrogen（TN）,total phosphorus（TP） and biogenic silicate（BSi） were discussed in sediment cores.The results showed that the dominant form of inorganic carbon was NH2OH·HCl form both in surface sediment and sediment cores;The content of NH2OH·HCl form in sediments ranges from 6.26 to 17.51 mg/g,with mean content of 14.02 mg/g,accounted for 82.77% of the total inorganic carbon in the sediments.The contents of inorganic carbon forms in surface sediment are rank as： NH2OH·HCl form HCl form NaCl form NH3·H2O form NaOH form.In terms of the horizontal characteristics,the central area was the high value area of inorganic carbon form,the east and north area were the low value area in the lake.Water depth and inorganic carbon present a good positive correlation（R2=0.86,P0.01）.The correlationship and the horizontal characteristics of inorganic carbon implied that the terrigenous material which were carried by inflowing rivers have dilute effect on sediments.The supersaturation coefficients of Calcium carbonate in different year in Dali Lake are far greater than 1（31.59IAP/Ksp166.92）.The calculation re

关 键 词：无机碳 形态 沉积物 达里诺尔湖 

分 类 号：X524[环境科学与工程—环境工程]