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http://dx.doi.org/10.14578/jkfs.2018.107.1.43

Short-term Effects of Warming and Precipitation Manipulation on Seasonal Changes in Fine Root Production and Mortality for Pinus densiflora Seedlings  

Han, Seung Hyun (Department of Environmental Science and Ecological Engineering, Korea University)
Chang, Hanna (Department of Environmental Science and Ecological Engineering, Korea University)
Son, Yowhan (Department of Environmental Science and Ecological Engineering, Korea University)
Publication Information
Journal of Korean Society of Forest Science / v.107, no.1, 2018 , pp. 43-49 More about this Journal
Abstract
This study was conducted to investigate the effects of warming and precipitation manipulation on seasonal changes in fine root production (FRP) and fine root mortality (FRM) of 33-month-old Pinus densiflora seedlings for two years. The seedlings in warmed plots were warmed with $3.0^{\circ}C$ higher using infrared heaters. The air temperature of warmed (TW) plots was set to increase by $3^{\circ}C$ compared to temperature control (TC) plots, and the three precipitation manipulation consisted of precipitation decrease (-30%; PD), precipitation increase (+30%; PI) and precipitation control (0%; PC). FRP ($mm\;mm^{-2}\;day^{-1}$) was significantly altered by only precipitation manipulation (PC: 3.57, PD: 4.59, PI: 3.02), while warming had no significant effect on the FRP and FRM. Meanwhile, interactions between warming and precipitation manipulation and seasonal changes had no significant effects on FRP and FRM. However, the influences of seasonal changes in soil temperature and soil moisture on FRP and FRM were different according to warming. In TW plots, FRP showed a positive relationship with soil temperature, and FRM showed a negative relationship with soil moisture. On the other hand, in the TC plots, FRP showed a positive relationship with soil moisture, and there were no relationships between FRM and soil temperature and moisture. These results indicate that the climate factors that affect FRP and FRM might vary as the warming progresses.
Keywords
climate change; fine root mortality; fine root production; seasonal change; soil moisture; soil temperature;
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