摘要
1997年 2月在东海北部取得悬浮体和底质样品 ,通过粒度分析和扫描电镜及能谱分析 ,探讨了陆架北部泥质区悬浮体的絮凝沉积作用。结果表明 ,生物因素是泥质区悬浮体的发生絮凝的机制之一 ,可影响悬浮体在海水中的行为。生物活动产生的软组织、分泌物和粘膜等有机质可将矿物碎屑和生物骨屑粘结、吸附和捕集在一起形成絮凝体而迅速沉积。在悬浮体含量较低、水化学环境相对稳定的东海陆架 ,絮凝作用是泥质区得以形成的关键过程之一。
Based on grain size analyses and observations with an SEM, sedimentation in response to aggregation of suspended material in a mud area of the northern East China Sea are studied. The results show that suspended sediment in the mud area become much finer after organic matter contained is removed. The organic matter is closely related to biological activities in the mud area. Biological activities supply biogenic matter for the mud area. The organic matter like mucus, secretion or organic films that are produced in biological activities can aggregate suspended particles (terrigenous detritus and biogenic detritus) by means of absorbing, agglutinating and or trapping. With this process, grain sizes of suspended sediment increase and it is much easier for suspended matterial to settle down to the sea floor. Therefore, aggregation is a key and significant process for the sedimentation of suspended material and the formation of the mud area, which has a small concentration of suspended sediment and is far from the land source area.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
2001年第3期288-295,共8页
Oceanologia Et Limnologia Sinica
基金
国家自然科学基金!重点资助项目 4 91 3 61 4 0及 4 96762 89号
关键词
悬浮体
东海陆架
泥质区
絮凝沉积作用
扫描电镜
粒度分布
底质
Suspended sediment, Aggregation, The continental shelf of East China Sea, The mud area, Sedimentation
