Abstract
BackgroundSoil respiration (RS) plays an important role in the concentration of atmospheric CO2 and thus in global climate patterns. Due to the feedback between RS and climate, it is important to investigate RS responses to climate warming.MethodsA soil warming experiment was conducted to explore RS responses and temperature sensitivity (Q10) to climate warming in subtropical forests in Southwestern China, and infrared radiators were used to simulate climate warming.ResultsWarming treatment increased the soil temperature and RS value by 1.4 °C and 7.3%, respectively, and decreased the soil water level by 4.2% (%/%). Both one- and two-factor regressions showed that warming increased the Q10 values by 89.1% and 67.4%, respectively. The effects of water on Q10show a parabolic relationship to the soil water sensitivity coefficient. Both RS and Q10 show no acclimation to climate warming, suggesting that global warming will accelerate soil carbon release.
Highlights
Soil is the largest pool of organic carbon in the terrestrial ecosystem, playing a crucial role in the global carbon cycle
Mean annual soil temperatures measured from the control and warming treatments were recorded as 11.1 ± 0.1 ◦C and 12.5 ± 0.1 ◦C, respectively, and warming significantly increased the soil temperature by 1.4 ◦C (Fig. 1B)
Mean annual soil water levels measured from the control and warming treatments were recorded as 30.3 ± 3.0% (v/v) and 29.0 ± 2.8% (v/v), respectively, reduced by 4.2% (%/%) (Fig. 1D)
Summary
Soil is the largest pool of organic carbon in the terrestrial ecosystem, playing a crucial role in the global carbon cycle. Soil respiration (RS) plays an important role in the concentration of atmospheric CO2 and in global climate patterns. Warming treatment increased the soil temperature and RS value by 1.4 ◦C and 7.3%, respectively, and decreased the soil water level by 4.2% (%/%). Both oneand two-factor regressions showed that warming increased the Q10 values by 89.1% and 67.4%, respectively. The effects of water on Q10 show a parabolic relationship to the soil water sensitivity coefficient Both RS and Q10 show no acclimation to climate warming, suggesting that global warming will accelerate soil carbon release
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