摘要：As a typical extreme environment, acid mine drainage (AMD) has been extensively studied for its biogeochemical cycle, but little is known about the quality of dissolved organic matter (DOM) in AMD. In this study, DOM molecules in an AMD lake were detected with Fourier transform ion cyclotron resonance mass spectrometry (FT-ICR MS), and the change of DOM molecules in the stratified water column was analyzed with a multi-sample evaluation procedure. The results demonstrate that DOM quality is highly stratified and can be linked with severe biogeochemical gradients. In the surface layer, DOM molecules can be distinguished by low quantities and intensities, as well as potential photodegradation products. Oxygen-poor and oxygen-rich molecules alternately dominate the chemocline, which can be explained by the redox-dependent adsorption/desorption of DOM on metastable secondary minerals. A rich and abundant DOM pool with a high proportion of heteroatoms exists at the bottom which can be significantly influenced by material exchange with sediments. These findings emphasize the active role of DOM in extreme AMD environments and expand the understanding of the carbon cycle in the hydrosphere.

关键字：Dissolved organic matter; acid mine drainage; stratification; biogeochemical cycle; FT-ICR MS

ISSN号：0013-936X

卷、期、页：卷: 55期: 12页: 8401-8409

发表日期：2021-06-15

影响因子：7.863700

期刊分区（SCI为中科院分区）：一区

收录情况：SCIE（科学引文索引网络版）

发表期刊名称：ENVIRONMENTAL SCIENCE & TECHNOLOGY

参与作者：She, Zhixiang,王进,Pan, Xin,Zhang, Siyu,岳正波

通讯作者：李运运

第一作者：何晨,史权

论文类型：期刊论文

论文概要：She, Zhixiang,王进,何晨,Pan, Xin,李运运,Zhang, Siyu,史权,岳正波，The Stratified Distribution of Dissolved Organic Matter in an AMD Lake Revealed by Multi-sample Evaluation Procedure，ENVIRONMENTAL SCIENCE & TECHNOLOGY，2021，卷: 55期: 12页: 8401-8409

论文题目：The Stratified Distribution of Dissolved Organic Matter in an AMD Lake Revealed by Multi-sample Evaluation Procedure