An alpine meadow soil chronology based on OSL and radiocarbon dating, Qinghai Lake, northeastern Tibetan Plateau
An alpine meadow soil chronology based on OSL and radiocarbon dating, Qinghai Lake, northeastern Tibetan Plateau
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基于光释光和放射性碳测年的青藏高原东北部青海湖高寒草甸土壤年代学
DOI：
10.1016/j.quaint.2020.05.044
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发表时间：
2020-08
影响因子：
2.2
通讯作者：
Manping Sun
中科院分区：
文献类型：
--
作者：
Jing Zhang;Chongyi E;Chengyong Wu;Yongjuan Sun;Ping Li;Yunkun Shi;Manping Sun
青藏高原广泛分布的高寒草甸土在该地区生态系统中起着核心作用，但其形成年代和成土过程却知之甚少。利用石英光激发发光（OSL）和富钾长石后红外激发发光（post-IR IRSL，pIRIR）技术，对青海湖东南部日月山两个高寒草甸土壤剖面的土壤发育年代进行了重建。此外，还利用加速器质谱法对土壤有机质（SOM）进行了14 C分析，对青藏高原西南部象皮山的高山草甸土壤剖面进行了测年。在日月山剖面采集了大量土壤样品，测定了土壤粒度和磁化率。结果显示：（1）石英OSL和钾长石pIRIR年龄的一致性，表明高山草甸土样品的石英OSL和钾长石pIRIR信号在埋藏前都有很好的漂白作用。（2）由于植物根部的现代有机污染，SOM放射性碳年龄很可能低估了样本年龄。(3)底质沉积物的光释光测年结果显示，末次冰消期后高山草甸土发育的下限，上层土壤有机质的放射性碳测年结果显示，高山草甸土发育的上限在1450 ± 80 calBP之前，主要发育于全新世晚期（4-0 ka）。(4)青藏高原高寒草甸土的粒度特征与大气尘和黄土相似，全新世晚期风成堆积迅速，反映了相对干旱寒冷的气候条件。
Extensive alpine meadow soil on the Tibetan Plateau (TP) plays a core role in the local ecological system, however, its ages of formation and pedogenic processes are relatively poorly understood. In this study, we reconstructed a soil development chronology for two alpine meadow soil sections on Riyue Mountain, southeast of Qinghai Lake (QHL), using quartz optically stimulated luminescence (OSL) and potassium-rich feldspar (K-feldspar) post-infrared infrared stimulated luminescence (post-IR IRSL, pIRIR) techniques. In addition, accelerator mass spectrometry14C analysis of soil organic matter (SOM) was used to date alpine meadow soil profiles on Xiangpi Mountain, southwest of QHL. Bulk samples were collected from Riyue Mountain profiles for determination of soil grain size and magnetic susceptibility. The results show: (1) Consistency of quartz OSL and K-feldspar pIRIR ages, indicating both the quartz OSL and K-feldspar pIRIR signal for alpine meadow soil samples are well bleached before burial.(2)SOM radiocarbon ages most likely underestimate sample age due to modern organic contamination from plant roots. (3) A lower limit on alpine meadow soil development after the last deglaciation based on OSL dating of bottom deposits, and an upper limit of before 1450 ± 80 cal BP from radiocarbon dating of the upper SOM; alpine meadow soils developed mainly during the late Holocene (4–0 ka) on the mountains around QHL. (4) The grain size characteristics of alpine meadow soil are similar to atmospheric dust and loess at QHL; the rapid aeolian accumulation in the late Holocene implies conditions of relative arid and cold climate.
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DOI：
10.1007/s11430-014-4836-1
发表时间：
2014-08
期刊：
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影响因子：
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