Climate-induced changes in the dissolved organic carbon budgets of boreal lakes

被引：249

作者：

Schindler, DW ^{[1
]}

Curtis, PJ ^{[1
]}

Bayley, SE ^{[1
]}

Parker, BR ^{[1
]}

Beaty, KG ^{[1
]}

Stainton, MP ^{[1
]}

机构：

[1] FISHERIES & OCEANS CANADA,INST FRESHWATER,WINNIPEG,MB R3T 2N6,CANADA

来源：

BIOGEOCHEMISTRY | 1997年 / 36卷 / 01期

基金：

加拿大自然科学与工程研究理事会;

关键词：

dissolved organic carbon; climatic change; mass balance budgets; lake acidification;

D O I：

10.1023/A:1005792014547

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

During 20 years of climatic warming, drought and increased forest fires between 1970 and 1990, DOC concentrations declined by 15-25% in lakes of the Experimental Lakes Area, northwestern Ontario, allowing increased penetration of both UV and photosynthetically-active radiation (PAR), and causing deeper euphotic zones and thermoclines. Decreased input to the lakes of DOC from terrestrial catchments and upstream lakes was the primary reason for the decline, although in-lake removal also increased slightly. Decreased streamflow caused by drought was more important than forest fires in affecting DOC exports from catchments. Experimental acidification of lakes caused even greater losses in DOG, by enhancing rates of in-lake removal. DOC in Lake 302S, acidified to pH 4.5 during the 1980's, declined to less than 10% of preacidification values.

引用

页码：9 / 28

页数：20

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