若尔盖RM孔有机碳、总氮和碳氮比值的垂直分布

VERTICAL DISTRIBUTION OF TOTAL ORGANIC CARBON, TOTAL NITROGEN AND C/N OF CORE RM IN ZOIGE

分析了ＲＭ孔岩心样５９５个．孔内总有机碳含量ＴＯＣ变动范围较大，低者１—２％，高者１０—２０％；总氮含量ＴＮ多０．１—０．２％，少数０．４—０．８％；碳氮比值Ｃ／Ｎ较低（≤８）段属浅湖沉积，Ｃ／Ｎ较高（＞８）段属湖滨沼泽沉积；ＴＯＣ，ＴＮ和Ｃ／Ｎ明显有四个波动段．

sediment samples of core RM in Zoige were analyzed. In the core total organic carbon TOC ranges obviously from lower 1-2% to higher 10-20%, total nitrogen TN are 0.1 0. 2% mostly and 0. 4-0. 8% rarely. The sediments containing lower C/N (ratio of total carbon to total nitrogen, ≤8) represent shallow lake environments and those higher C/N (>8) are littoral and swampy environments. There exist 4 fluctuation stages with regard to TOC, TN and C/N.