Journal
JOURNAL OF AGRICULTURAL METEOROLOGY
Volume 76, Issue 3, Pages 119-127Publisher
SOC AGRICULTURAL METEOROLOGY JAPAN
DOI: 10.2480/agrmet.D-19-00026
Keywords
Basal respiration; Plant area index; Q(10); Sasa; Soil water content
Funding
- Environment Research and Technology Development Fund of the Environmental Restoration and Conservation Agency [2-1705]
- Global Environment Research Fund [B-073]
- Global Environment Research Coordination System (Evaluation of the potential effect of global warming on soil carbon emission of Japanese forest ecosystems) of the Ministry of the Environment, Government of Japan
- Ministry of Education, Culture, Sports, Science and Technology, Japan [25241002, 26292076, 16K14934]
- Global Environmental Monitoring Program of the National Institute for Environmental Studies
- Climate Change Research Program of the National Institute for Environmental Studies
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To understand the magnitudes of temporal variation in soil respiration (R-s) and its spatial heterogeneity, and the effect of abiotic and biotic factors to cause the variation in a young plantation recovering after the clear-cutting of a mature forest, we analyzed 8 year R-s, microclimate, and vegetation data obtained in a young hybrid larch plantation with dense undergrowth of dwarf bamboo Sasa in northern Japan during snow-free periods from 2004 to 2014. R-s was measured by a multichannel automated chamber system and was resolved into two components, temperature sensitivity of respiration, Q(10), and temperature-normalized basal respiration at 10 degrees C, R-10. Volumetric soil water content affects both seasonal and inter-annual variation of R-s by suppressing R-10, whereas soil temperature affects only its seasonal variation. Vegetation recovery had significant effect on both temporal variation and spatial heterogeneity in R-s, although the tree and undergrowth Sasa had different contribution to these variations. Increase in the undergrowth Sasa PAI (plant area index) recovering after clear-cutting increased the R-s through the increase in Q(10), whereas the spatial heterogeneity in R-s was increased by the increase in the tree PAI through the increase in R-10. These results reveal that the soil water and vegetation has strong effect on the inter-annual variation of R-s and its spatial heterogeneity in the recovering young plantation, in spite of the strong exponential relationship of R-s with T-s in their seasonal variation. Although our results were obtained under the limited range in the inter-annual variation in seasonal mean T-s (< 2 degrees C), this may not be the unique case only in our study site and gives us a caution when predicting R-s in future wanner environment.
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