关中盆地LGT全新世剖面N含量及其环境意义探讨  

Total nitrogen and its environmental significance at LGT Holocene profile, Eastern Guanzhong basin

作　　者：徐勤向[1] 庞奖励[1] 黄春长[1] 

机构地区：[1]陕西师范大学旅游与环境学院西北历史环境与经济社会发展研究中心,陕西西安710062

出　　处：《宝鸡文理学院学报（自然科学版）》2005年第2期144-147,151,共5页Journal of Baoji University of Arts and Sciences(Natural Science Edition)

基　　金：国家自然科学基金项目(40471119);陕西省自然基金(2003D01)资助

摘　　要：通过对关中盆地LGT全新世剖面的土壤全氮(TN)含量分析研究发现,全氮在黄土、古土壤中的含量明显不同,黄土中均值0.294 0 g/kg,古土壤中均值0.385 6 g/kg,在剖面上呈现出明显的高值和低值交替变化的特征,这种变化与磁化率曲线可进行良好的对比,且与土壤黄土序列对应也良好。认为全氮可作为一个气候替代指标。全氮含量高指示暖湿的生物活动强的气候条件,反之,含量低则指示冷干的生物活动弱的气候条件。The total content as a climatic proxy is often used in studying of lake and sea deposition condition but hardly used in the Holocene loess-soil sequence on the Loess Plateau. Based on particular survey in the field, LGT Holocene profile in the Eastern Guanzhong basin, Shaanxi, China is selected and total nitrogen content and magnetic susceptibility are measured. The studied results show that total nitrogen content is 0.294 0 g/kg in loess,and 0.385 6 g/kg in soil. What is more, total nitrogen content appears high-low superseded change in the loess profile. At 0～40 cm, 96～196 cm, 210～274 cm, the profile show three high values, corresponding respectively TS, S^1_0, S^2_0,at 40～96 cm, 196～210 cm, 274 ～380 cm appear three low values, corresponding respectively L_0, L_x, L_1. The change of total nitrogen content is in correspondence with magnetic susceptibility curve and the loess-soil sequence. So total nitrogen is offspring of the special climate condition, the content and the distribution is in reference to climate condition. So total nitrogen can be a climatic proxy that recover palaeoclimate. High total nitrogen content shows warm-humid climatic environment, whereas low total nitrogen content shows cold-dry climatic environment.

关 键 词：全氮(TN) 关中盆地 替代指标 全新世 

分 类 号：P532[天文地球—古生物学与地层学] P595[天文地球—地质学]