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首页> 外文期刊>Chinese Journal of Geochemistry >First investigation of desert Lake Hongjiannao, Shannxi Province based on its sediment study
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First investigation of desert Lake Hongjiannao, Shannxi Province based on its sediment study

机译：基于沉积物研究的陕西红建na荒漠湖的首次调查

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摘要

By multi-proxy analysis of grain-size, magnetic susceptibility (MS) , Fe/Mn and Rb/Sr ratios, TOC and other chemical elements, environmental changes in the Hongjiannao Lake over the past 80 years were discussed. It is revealed that the lake formed during 1928—1952 A. D. , characterized by relatively high Fe/Mn ratio and lower Rb/Sr ratio, MS value and lake productivity. During this period sandstorms were prevalent with three extremes occurring in 1936, 1939 and 1941 A. D. , respectively. In the short time period of 1952 - 1960 A. D. , the water level of the lake rose remarkably, as shown by a sharp increase in coarse slit and MS value, as well as the obvious dilution of geochemical element concentrations in lake sediments. The lake expansion is ascribed to both much more rainfall and human activities, especially in about 1958 A. D. , when a great deal of channeled-off water from the around swamps was let to in-pour into the lake. The lithological characteristics and sediment proxies reflect that the Hongjiannao Lake has already developed into a stable deep lake since the 1960s, characterized by the higher lake productivity and Rb/Sr ratio and lower Fe/Mn ratio. The frequency and intensity of sandstorms have also reduced greatly since the 1960s due to natural conservation activities. The drop of water level since the middle of the 1990s may be related to a warm and dry climate.
机译：通过粒度，磁化率（MS），Fe / Mn和Rb / Sr比，TOC等化学元素的多代理分析，探讨了红碱na湖过去80年的环境变化。结果表明，该湖在公元1928年至1952年之间形成，其特征是较高的Fe / Mn比和较低的Rb / Sr比，MS值和湖泊生产力。在此期间，沙尘暴盛行，分别在公元1936年，1939年和1941年发生三个极端事件。在1952年至1960年A. D.的短时期内，湖泊的水位显着上升，这表明粗裂隙和MS值急剧增加，以及湖泊沉积物中地球化学元素浓度的明显稀释。湖泊的扩张归因于更多的降雨和人类活动，特别是在公元1958年左右，当时大量沼泽附近的水被倒入湖中。岩性特征和沉积物近似值反映了自1960年代以来红碱na湖已经发展成为一个稳定的深湖，其特征是湖泊生产力更高，Rb / Sr比更高，Fe / Mn比更低。自1960年代以来，由于自然保护活动，沙尘暴的频率和强度也大大降低了。自1990年代中期以来的水位下降可能与温暖干燥的气候有关。

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