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Effects of converting natural grasslands into planted grasslands on ecosystem respiration: a case study in Inner Mongolia, China

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Abstract

With increasingly intensifying degradation of natural grasslands and rapidly increasing demand of high quality forages, natural grasslands in China have been converted into planted grasslands at an unprecedented rate and the magnitude of the conversion in Inner Mongolia is among the national highest where the areal extent of planted grasslands ranks the second in China. Such land-use changes (i.e., converting natural grasslands into planted grasslands) can significantly affect carbon stocks and carbon emissions in grassland ecosystems. In this study, we analyzed the effects of converting natural grasslands into planted grasslands (including Medicago sativa, Elymus cylindricus, and M. sativa+E. cylindricus) on ecosystem respiration (F eco ) in Inner Mongolia of China. Diurnal F eco and its components (i.e., total soil respiration (F ts), soil heterotrophic respiration (F sh) and vegetation autotrophic respiration (F va)) were measured in 2012 (27 July to 5 August) and 2013 (18 July to 25 July) in the natural and planted grasslands. Meteorological data, aboveground vegetation data and soil data were simultaneously collected to analyze the relationships between respiration fluxes and environmental factors in those grasslands. In 2012, the daily mean F eco in the M. sativa grassland was higher than that in the natural grassland, and the daily mean F va was higher in all planted grasslands (i.e., M. sativa, E. cylindricus, and M. sativa+E. cylindricus) than in the natural grassland. In contrast, the daily mean Fts and Fsh were lower in all planted grasslands than in the natural grassland. In 2013, the daily mean F eco, F ts and F va in all planted grasslands were higher than those in the natural grassland, and the daily mean F sh in the M. sativa+E. cylindricus grassland was higher than that in the natural grassland. The two-year experimental results suggested that the conversion of natural grasslands into planted grasslands can generally increase the F eco and the increase in F eco is more pronounced when the plantation becomes more mature. The results also indicated that F sh contributed more to F eco in the natural grassland whereas F va contributed more to F eco in the planted grasslands. The regression analyses show that climate factors (air temperature and relative humidity) and soil properties (soil organic matter, soil temperature, and soil moisture) strongly affected respiration fluxes in all grasslands. However, our observation period was admittedly too short. To fully understand the effects of such land-use changes (i.e., converting natural grasslands into planted grasslands) on respiration fluxes, longer-term observations are badly needed.

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Acknowledgments

This study was supported by the National Basic Research Program of China (2014CB138803), the National Natural Science Foundation of China (31570451), and the Program for Changjiang Scholars and Innovative Research Team in University (IRT1108). We thank the staff of the Duolun Grassland Research Station, Inner Mongolia, and LIN Guohui and ZHAO Shijie for their help during the field observations.

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  1. State Key Laboratory of Earth Surface Processes and Resource Ecology, College of Resources Science and Technology, Beijing Normal University, Beijing, 100875, China

    Meng Zhang, Xiaobing Li, Hong Wang, Fei Deng, Xu Li & Xue Mi

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  1. Meng Zhang
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Zhang, M., Li, X., Wang, H. et al. Effects of converting natural grasslands into planted grasslands on ecosystem respiration: a case study in Inner Mongolia, China. J. Arid Land 9, 38–50 (2017). https://doi.org/10.1007/s40333-016-0059-y

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