Effects of post-fire conditions on soil respiration in boreal forests with special reference to Northeast China forests

Abstract

Forest fires frequently occur in boreal forests, and their effects on forest ecosystems are often significant in terms of carbon flux related to climate changes. Soil respiration is the second largest carbon flux in boreal forests and the change in soil respiration is not negligible. Environmental factors controlling the soil respiration, for example, soil temperature, are altered by such fires. The abnormal increase in soil temperature has an important negative effect on soil microbes by reducing their activities or even by killing them directly with strong heat. On the other hand, although vegetation is directly disturbed by fires, the indirect changes in soil respiration are followed by changes in root activities and soil microbes. However, there is very limited information on soil respiration in the forests of Northeast China. This review, by combining what is known about fire influence on soil respiration in boreal forests from previous studies of post-fire effects on soil conditions, soil microbes, and forest regeneration, presents possible scenarios of the impact of anticipated post-fire changes in forest soil respiration in Northeast China.

Key words： boreal forests; Northeast China; forest fires; forest regeneration; soil microbes; soil respiration

Acknowledgements

Thanks are due to the National Natural Science Foundation of China (Grant Nos. 30700639 and 30471386 to Laiye QU and Xiaoniu XU, respectively).

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