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Effects of climate warming on the production of the pioneer moss Racomitrium japonicum: seasonal and year-to-year variations

  • Regular Paper – Ecology/Ecophysiology/Environmental Biology
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Abstract

Pioneer mosses are among the dominant vegetation in the early stages of xeric successions. Recent climate warming may have a significant effect on the productivity of these mosses, thereby affecting successional processes. In this study, we investigated the effects of temperature changes on the productivity of Racomitrium japonicum, a pioneer moss species commonly found on open ground in Japan. We examined the microclimate (moss temperature and water content) of a natural R. japonicum stand in Higashi-Hiroshima City, western Japan, and related them to the climate records of the weather station to create a model for estimating microclimate from past climatic data. We also examined the effects of environmental factors (light, temperature, and water) on photosynthesis in the laboratory to construct a production model. Using these models, we estimated the net primary production (NPP) over the last 10 years (2009–2018) based on the climatic data (air temperature and precipitation) recorded at the weather station of Higashi-Hiroshima City. The estimated NPP showed negative values in summer, which indicated that respiratory carbon loss exceeded photosynthetic carbon gain. In contrast, NPP was positive in the spring and winter seasons throughout the 10 years. Autumn NPP varied widely, showing both positive and negative values. The annual NPP also showed considerable year-to-year variations. Additionally, we examined the effects of temperature conditions on NPP assuming annual temperature changes of 0 °C (present temperature), + 1 °C, and + 2 °C. The results indicated that NPP decreased with increasing temperature, except in the winter season. The findings of this study suggest that climate warming has a large impact on the NPP of R. japonicum; however, the impact can be both positive and negative depending on the season. The results also suggest that future climate warming is likely to decrease NPP on an annual basis.

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Acknowledgments

We would like to thank Dr. Masaki Uchida of the National Institute of Polar Research for his helpful advice during the photosynthesis measurements, Dr. Yoko Iwamoto of the Graduate School of Integrated Sciences for Life, Hiroshima University, for providing us with solar radiation data, and Editage (www.editage.com) for English language editing.

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Correspondence to Soshi Osaki.

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Osaki, S., Nakatsubo, T. Effects of climate warming on the production of the pioneer moss Racomitrium japonicum: seasonal and year-to-year variations. J Plant Res 134, 115–126 (2021). https://doi.org/10.1007/s10265-020-01240-w

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