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Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China

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Abstract

Qilian juniper (Sabina przewalskii Kom.) and Qinghai spruce (Picea crassifolia Kom.) represent different tree functional types, which can be found extensively in northwestern China. The former is drought-tolerant, whereas the latter is hygrophilous and shade-tolerant. We compared their intrinsic water-use efficiency (iWUE, inferred from carbon isotopic discrimination, δ13C, in their wood) as a function of atmospheric CO2 concentration, [CO2], and climate. δ13C of spruce was consistently about \({1.23\permille}\) higher than that of juniper in semi-arid areas but was lower in arid areas. This difference was stable over time and demonstrated strong cross-correlations between species, although some subtle high-frequency (2 or 3 years) variations existed in both species, suggesting that regional climate may control carbon isotope discrimination. The \({{C_{\rm i}/C_{\rm a}}}\) ratio (the [CO2] values in leaf intercellular and the atmosphere, respectively) of the juniper increased steadily over time, whereas that of the spruce showed a long-term downward trend. IWUE increased at all sites over the 150-year study period, mainly caused by increasing [CO2]. The relationship between iWUE and [CO2] reveals that the spruce was more sensitive than the juniper to increasing [CO2], suggesting a species-specific adaptation to long-term environmental changes. Correlations between the high-frequency variations in stable carbon discrimination (Δ) and climate indicate similar intra-site responses to climate in both species, but different response strengths. Overall, complex interactions of temperature and moisture on stable carbon discrimination during current growth seasons of both species were environmental-determined. Regulation of gas exchange and reduced transpiration may influence water and energy budgets directly; therefore species-dependent responses of trees to elevated CO2 should be considered in future research on global plant physiological ecology.

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Acknowledgments

This research was supported by the National Natural Science Foundations of China (40501076), the Ministry of Science and Technology of China (Grant No. 2005DIB3G100), and the Import-Talents Program of the Cold and Arid Regions Environmental and Engineering Research Institute (058170), Chinese Academy Sciences, and International Partnership Project of Chinese Academy Sciences (CXTD-Z2005-2), and the foundation of the Key Laboratory of Cryosphere and Environment (058143). The authors gratefully acknowledge Geoff Hart for improvement of the English in the manuscript. We also thank Dr. Lei Huang, Haifeng Zhu, Jicheng He, and others for their help with the fieldwork. We also thank the anonymous reviewers and the editor whose comments and suggestions were helpful in the improvement of the quality of this article.

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Authors and Affiliations

  1. Key Laboratory of Cryosphere and Environment, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Donggang West Road No 320, Lanzhou, 730000, China

    Xiaohong Liu, Tuo Chen, Dahe Qin & Jiawen Ren

  2. Institute of Geographical Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing, 100101, China

    Xiaohong Liu & Xuemei Shao

  3. Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing, 100085, China

    Xuemei Shao & Eryuan Liang

  4. Laboratory of Watershed Hydrology and Applied Ecology, Cold and Arid Regions Environmental and Engineering Research Institute, Chinese Academy of Sciences, Lanzhou, 730000, China

    Liangju Zhao

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  1. Xiaohong Liu
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Correspondence to Xiaohong Liu.

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Liu, X., Shao, X., Liang, E. et al. Species-dependent responses of juniper and spruce to increasing CO2 concentration and to climate in semi-arid and arid areas of northwestern China. Plant Ecol 193, 195–209 (2007). https://doi.org/10.1007/s11258-006-9258-5

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