摘要
对东海中陆架泥质区及其周边的表层沉积物分别利用容量法、元素分析仪法进行了IC、OC含量分析，利用筛析法和沉降法进行了粒度分析。结果表明，研究区IC含量均明显高于OC含量。OC含量在泥质区高，砂质区低；IC含量分布为：近岸细粒沉积区为相对高值区，中陆架砂质区为低值区，中陆架泥质区为高值区，外陆架砂质区为特高值区。OC富集主要受控于上覆水体的生物生产量、沉积动力环境以及海底物理化学条件。IC的分布受物源影响明显，其富集与该区的环流格局相对应，主要受控于研究区的沉积动力环境和它们的时空变化。研究区的现代海底固碳能力可分为强固碳能力的中陆架泥质区、弱固碳能力的中陆架砂质区和基本无固碳能力的外陆架砂质区。
Anayses of grain size using sieve and sedimentation methods (< 0.063mm),concentrahons of inorganic carbon (IC) using volumetric method and concentrahons of orghoc carbon (OC) using element instrUment analysis of 35 surface sediment samples collected from the middie continenta shelf mud area and its adoining East Chna Sea areas in 1987 and 1994 respechvely,were carried out. The results show that the middle conhnental shelf mud area is associated with high concentrations of oC The OC decreases from the center of the mud area towards its adjacent sand areas. The distribution of concentrations of IC can be divided into 4 subprovinces, namely, relative high IC in the coastal area, low IC in the middle continental shelf sand are4 high IC in the middle continental shelf mud area and highest IC in the outer continental shelf sand area. on the basis of the analysis for 11 surficial sediment samples, the concentrations of IC are higher than those of OC.The concentalons of OC is a closely related to the gtaln size, indicating that the distribution pattern of OC in the surfase sediments is mainly controlled by the orgbosm production of the above sea water, the sedimentary dynamic environment in association with the cireulation system, and the conditions of physical chemistry on the sea-floor. In contrast the distribution pattern of IC is related to the support amount of different source of carbon, and has a good coerespondence to the distribution of circulation system, indicating tha the distribution pattern of IC is mainly controlled by the sedimentary dynamic environment and its spahal and tempora changes, especially the seasonal change in the circulation system of the study area. Based on the ability for modern carbon adsorption of the seafloor, the study area can be falen into 3 typical areas, namely, the middle conhnental shelf mud area with high carbon storage, middle continental shelf sand area with low carbon storage and the outer continental shelf sand area without the storage of carbon.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1999年第4期421-426,共6页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!49676289
高等院校博士点专项基金
关键词
表层沉积物
有机碳
无机碳
海底固碳能力
东海
Surface sediments
Organic carbon
Inorganic carbon
The distribution pattern of carbon
Ability of carbon's cateh in the sea-floor
