摘要
于1989年12月采用210Ph法测定昆明滇池（草海和外海）两个柱样的沉积速率，其值分别为0．29cm/a和0．28cm/a，平均值约为0．29cm/a。在沉积柱12cm以上，由于人为影响，其沉积速率没有规律，估计约有30—40年的历史。在12cm以下，210Pbex随深度的变化明显地表现出规律性，以0．29cm/a的速率计算，从12cm到40cm这一段大约有90年的沉积历史。
The sedimentation rates of two sediment cores (Caohai and Waihai)in Kunming's Dianchi Lake determined by 210Pb dating in 1989 are 0. 29 cm/aand 0.28 cm/a respectively, and not regular above 12 cm at the two cores due toanthropengenic influence. The sedimentation rates were calculated based on the210pb radioactivity's very regular variation under 12 cm of the cores. Thesedimentary history was estimated to be about 90 years from 12 cm to 40 cm ofthe cores based on the sedimentary rate of 0.29 cm/a.
出处
《海洋与湖沼》
CAS
CSCD
北大核心
1996年第1期41-45,共5页
Oceanologia Et Limnologia Sinica
基金
中国环科院资助!890450
关键词
沉积速率
沉积物
沉积柱
滇池
昆明
Sedimentation rates
^(210)Pb dating method
Tracer
Decay
Sediment core
