Abstract
Drought-related forest growth declines are observed globally in main forest types, especially with repeatedly hot droughts. Therefore, quantifying forest resilience and identifying the factors driving resilience in response to extreme drought with the consideration of atmospheric CO2 fertilization is crucial for the accurate assessment of forest dynamics under current climate change, particularly for the widespread and climate-sensitive spruce forests in the arid Tianshan Mountains, China. Here, we explored the growth response of Schrenk spruce (Picea schrenkiana) to six extreme drought events since 1900, and investigated how tree resilience in pure stands is related to local drought intensity, cambial age (CA), and intrinsic water-use efficiency (iWUE). Specifically, we found that spruce trees had a mean resistance (Rt) value of less than 1, with iWUE contributing less to Rt variation. The results are in agreement with the drought-induced limitations on tree growth in response to increasing CO2, in spite of rising iWUE trends. However, increased iWUE has significant and positive impacts on the recovery (17%) and resilience (15%) of trees, suggesting that increased iWUE enhances the restoration of Schrenk spruce growth after extreme drought events. The growth resilience indices of Schrenk spruce showed that juvenile and adult trees exhibit different strategies to mitigate the drought influences. This study indicated that tree age, climate conditions, and variation in iWUE should be considered simultaneously in drought resilience evaluations to assess forest dynamics objectively in relation to climate change (i.e., drought) and propose appropriate forest management strategies.
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Acknowledgements
This study was supported by the National Natural Science Foundation of China (Grants 41701229, 41871030, and 41721091), by the Self-determination Project of the State Key Laboratory of Cryospheric Science (Grants SKLCS-ZZ-2020), by the Fundamental Research Funds for the Central Universities (Projects No. GK201801007), and by Foundation for Excellent Youth Scholars of “Northwest Institute of Eco-Environment and Resources”, CAS (Grant FEYS2019010).
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Wu, G., Liu, X., Chen, T. et al. The positive contribution of iWUE to the resilience of Schrenk spruce (Picea schrenkiana) to extreme drought in the western Tianshan Mountains, China. Acta Physiol Plant 42, 168 (2020). https://doi.org/10.1007/s11738-020-03158-1
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DOI: https://doi.org/10.1007/s11738-020-03158-1