IMPROVEMENTS TO THE DIURNAL UPSTREAM-DOWNSTREAM DISSOLVED-OXYGEN CHANGE TECHNIQUE FOR DETERMINING WHOLE-STREAM METABOLISM IN SMALL STREAMS

被引:219
作者
MARZOLF, ER
MULHOLLAND, PJ
STEINMAN, AD
机构
关键词
D O I
10.1139/f94-158
中图分类号
S9 [水产、渔业];
学科分类号
0908 ;
摘要
Whole-stream metabolism in a first-order stream was measured using upstream-downstream changes in dissolved oxygen (DO) concentration measured at 1-min intervals over a 40-h period. The measured change in DO was corrected for reaeration flux using a reaeration coefficient determined from injections of conservative and volatile tracers. The whole-stream metabolism measurement was compared in the spring with in situ chamber measurements performed a few days later in the same stream reach. Chamber measurements of community respiration extrapolated to a 24-h period (CR(24)) were about one third the whole-stream measurements, while gross primary production (GPP) measured at midday in the chambers was roughly 20% less than the whole-stream estimate. Whole-stream GPP was higher during the spring just prior to forest canopy closure than in summer or autumn. Community respiration exceeded whole-stream GPP on all dates and was greatest during the summer. Our results suggest that this whole-stream approach provides a measure of total stream metabolism that is relevant to other stream ecosystem processes measured on reach scales, such as nutrient spiralling.
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页码:1591 / 1599
页数:9
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