Acid induced changes in DOC quality in an experimental whole-lake manipulation

被引:63
|
作者
Donahue, WF [1 ]
Schindler, DW
Page, SJ
Stainton, MP
机构
[1] Univ Alberta, Dept Biol Sci, Edmonton, AB T6G 2E9, Canada
[2] Fisheries & Oceans Canada, Inst Freshwater, Winnipeg, MB R3T 2N6, Canada
关键词
D O I
10.1021/es980306u
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
Fluorescence analyses of archived water samples were used to typify dissolved organic carbon (DOC) quality in experimentally acidified lakes and reference lakes at the Experimental Lakes Area, in northwestern Ontario. Carbon-specific DOC fluorescence (CSF) during peak acidification (pH 4.5) was 40-50% of that for a high-DOG reference lake and similar to a low-DOC reference lake. Reference lakes showed similar but smaller decreases in CSF during several years of prolonged drought in the late 1980s. During the 1990s, recovery from acidification resulted in increased CSF, whereas reference lakes remained unchanged during the same time period. In addition to causing decreased [DOC], acidification causes changes in fluorescence-peak geometry that indicate a switch in DOC quality from allochthonous to "autochthonous-like" during acidification. The acid-induced change in DOC quality was likely due to increased chemical oxidation or precipitation of the UV-absorbent aromatic portions of allochthonous DOC molecules, leaving more UV-transparent aliphatic chains. The change in the nature of DOC following acidification and drought may have an important role in physical, biological, and chemical processes within these lakes. With recovery from acidification, DOC quality has also recovered.
引用
收藏
页码:2954 / 2960
页数:7
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