What are the effects of wooded riparian zones on stream temperature?

Environmental Evidence

Andrew S Pullin²  David M Hannah¹  Harriet Orr³  Rebecca Mant²  Diana E Bowler² 

[1] School of Geography, Earth and Environmental Sciences, University of Birmingham, Birmingham, B15 2TT, UK;Centre for Evidence-Based Conservation, School of Environment, Natural Resources & Geography, Bangor University, Bangor, Gwynedd, LL57 2UW, UK;Environment Agency, Environment Centre Wales, Deiniol Road, Bangor, LL57 2UW, UK

关键词: Systematic review;    Climate change;    Fish;    Riparian buffer;    Stream temperature;   

Others  :  803120
DOI  :  10.1186/2047-2382-1-3

 received in 2011-11-18, accepted in 2012-05-01,  发布年份 2012

【 摘 要 】

Background

Predicted increases in stream temperature due to climate change will have a number of direct and indirect impacts on stream biota. A potential intervention for mitigating stream temperature rise is the use of wooded riparian zones to increase shade and reduce direct warming through solar radiation. To assess the effectiveness of this intervention, we conducted a systematic review of the available evidence for the effects of wooded riparian zones on stream temperature.

Methods

We searched literature databases and conducted relevant web searches. Inclusion criteria were: subject - any stream in a temperate climate; intervention - presence of trees in the riparian zone; comparator - absence of trees in the riparian zone; outcome measure - stream temperature. Included studies were sorted into 3 groups based on the scale of the intervention and design of the study. Two groups were taken forward for synthesis; Group 1 studies comparing water temperature in streams with and without buffer strips/riparian cover and Group 2 comparisons of stream temperatures in open and forested landscapes. Temperature data were extracted and quantitative synthesis performed using a random effects meta-analysis on the differences in mean and maximum temperature.

Results

Ten studies were included in each of Groups 1 and 2. Results for both groups suggest that riparian wooded zones lower spring and summer stream temperatures. Lowering of maximum is greater than lowering of mean temperature. Further analysis of environmental variables that might modify the effects of the intervention was not possible using the limited set of studies.

Conclusions

Wooded riparian zones can reduce stream temperatures, particularly in terms of maximum temperatures. Because temperature is known to affect fish, amphibian and invertebrate life history, the reported effect sizes are likely to have a biological significance for the stream biotic community. Consequently investment in creation of wooded riparian zones might provide benefits in terms of mitigating some of the ecological effects of climate change on water temperature. Considerable uncertainty lies in the environmental variables that may modify the cooling effect of wooded riparian zones, and therefore it is not possible to identify when the use of this intervention for cooling would be most valuable.

【 授权许可】

   
2012 Bowler et al.; licensee BioMed Central Ltd.

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