Drought-Affected Populus simonii Carr. Show Lower Growth and Long-Term Increases in Intrinsic Water-Use Efficiency Prior to Tree Mortality
Abstract
:1. Introduction
2. Materials and Methods
2.1. Experimental Sites and Sample Collection
2.2. Tree-Ring Width and Carbon Isotope Analyses
2.3. iWUE Calculation
2.4. Meteorological Data and Potential Evapotranspiration
2.5. Data Analysis
3. Results
3.1. Meteorological Factors and Potential Evapotranspiration (ET0)
3.2. Relationship between Poplar Growth and Dieback
3.3. Differences in Tree-Ring δ13C
3.4. Differences in iWUE
3.5. Relationship between Tree-Ring Records and Environmental Factors
3.6. Relationship between Radial Growth and iWUE
4. Discussion
4.1. Differences in Radial Growth before Drought-Induced Death
4.2. Differences in iWUE before Drought-Induced Death
4.3. Early-Warning Signals of Drought-Induced Death
5. Conclusions
Author Contributions
Funding
Acknowledgments
Conflicts of Interest
References
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Sun, S.; Qiu, L.; He, C.; Li, C.; Zhang, J.; Meng, P. Drought-Affected Populus simonii Carr. Show Lower Growth and Long-Term Increases in Intrinsic Water-Use Efficiency Prior to Tree Mortality. Forests 2018, 9, 564. https://doi.org/10.3390/f9090564
Sun S, Qiu L, He C, Li C, Zhang J, Meng P. Drought-Affected Populus simonii Carr. Show Lower Growth and Long-Term Increases in Intrinsic Water-Use Efficiency Prior to Tree Mortality. Forests. 2018; 9(9):564. https://doi.org/10.3390/f9090564
Chicago/Turabian StyleSun, Shoujia, Lanfen Qiu, Chunxia He, Chunyou Li, Jinsong Zhang, and Ping Meng. 2018. "Drought-Affected Populus simonii Carr. Show Lower Growth and Long-Term Increases in Intrinsic Water-Use Efficiency Prior to Tree Mortality" Forests 9, no. 9: 564. https://doi.org/10.3390/f9090564