Source and biolability of ancient dissolved organic matter in glacier and lake ecosystems on the Tibetan Plateau
Source and biolability of ancient dissolved organic matter in glacier and lake ecosystems on the Tibetan Plateau
复制标题
青藏高原冰川湖泊生态系统中古代溶解有机物的来源及生物稳定性
DOI：
10.1016/j.gca.2014.08.006
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发表时间：
2014-10
影响因子：
5
通讯作者：
Spencer R. G. M., Guo W.D., Raymond P. A., Dittma
中科院分区：
文献类型：
--
作者：
Spencer R. G. M., Guo W.D., Raymond P. A., Dittma
青藏高原是世界上最大和最高的高原，拥有格陵兰岛和南极洲冰盖以外地球上最大的冰块，以及丰富的湖泊。本文研究了青藏高原冰川冰、冰川河流和高山湖泊中溶解有机物（DOM）的分子和同位素特征沿着生物活性。目的是评估DOM的来源以及DOM为下游生态系统提供碳补贴的潜力。西藏冰川和冰川溪流的溶解有机碳（DOC）浓度较低（17.7-27.9 μM），DOC放射性碳年龄为749-2350 ybp。西藏冰川DOM的光学性质、稳定碳同位素比值（δ 13 C-DOC）和分子组成（傅立叶变换离子回旋共振质谱）与世界其他冰川系统的数据一致。西藏冰川DOM的地球化学特征和古表观年龄表明，很大一部分来自大气沉积的前年龄，可能是化石燃料衍生的有机物。在西藏高山湖泊中，DOC也是古老的（525-675 ybp），这是由于来自冰川径流的老化前有机物的输入，直接沉积，或由于原位有机物的老化（即放射性碳库效应）。冰川冰和冰川流站点表现出较高的DOC生物活性，因此为下游环境提供了碳补贴，这些环境将随着青藏高原冰川退缩而发生变化。
The Tibetan Plateau is the world’s largest and highest plateau and holds the largest mass of ice on Earth outside the ice-sheets of Greenland and Antarctica, as well as abundant lakes. This study examined the molecular and isotopic signatures of dissolved organic matter (DOM) along with its biolability in glacier ice, glacier-fed streams, and alpine lakes on the Tibetan Plateau. The aim was to assess the sources of DOM and the potential of DOM to provide a carbon subsidy to downstream ecosystems. Tibetan glaciers and glacier streams exhibited low dissolved organic carbon (DOC) concentrations (17.7–27.9 μM) and ancient DOC radiocarbon ages (749–2350 ybp). The optical properties, stable carbon isotope ratios (δ13C-DOC) and the molecular composition (Fourier transform ion cyclotron resonance mass spectrometry) of Tibetan glacier DOM are consistent with data from other glacier systems around the world. The geochemical signatures and the ancient apparent ages of Tibetan glacier DOM suggest a significant fraction is derived from the atmospheric deposition of pre-aged, possibly fossil fuel derived organics. Within the Tibetan alpine lakes, DOC was also ancient (525–675 ybp), due to either inputs of pre-aged organics from glacier runoff, direct deposition, or due to the aging of organics in situ (i.e. a radiocarbon reservoir effect). The glacier ice and glacier stream sites exhibited high biolability of DOC and so provide a carbon subsidy to downstream environments that will change as glaciers on the Tibetan Plateau recede.
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影响因子：
8.3
作者：
P. Steier;R. Drosg;M. Fedi;W. Kutschera;M. Schock;D. Wagenbach;E. Wild
通讯作者：
P. Steier;R. Drosg;M. Fedi;W. Kutschera;M. Schock;D. Wagenbach;E. Wild
影响因子：
18.3
作者：
Neff, J. C.;Ballantyne, A. P.;Reynolds, R. L.
通讯作者：
Reynolds, R. L.
中国冰冻圈变化
影响因子：
3.9
作者：
Li, Xin;Cheng, Guodong;Shen, Yongping
通讯作者：
Shen, Yongping
影响因子：
2.7
作者：
Dittmar, Thorsten;Koch, Boris;Kattner, Gerhard
通讯作者：
Kattner, Gerhard
影响因子：
18.3
作者：
Dittmar, Thorsten;Paeng, Jiyoung
通讯作者：
Paeng, Jiyoung