Soil warming increases soil temperature sensitivity in subtropical Forests of SW China
Chaoxiang Yuan,
Guiqing Zhu,
Shuangna Yang,
Gang Xu,
Yingyun Li,
Hede Gong,
Chuansheng Wu
Affiliations
Chaoxiang Yuan
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Guiqing Zhu
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Shuangna Yang
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Gang Xu
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Yingyun Li
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Hede Gong
School of Geography and Ecotourism, Southwest Forestry University, Kunming, China
Chuansheng Wu
Anhui Province Key Laboratory of Environmental Hormone and Reproduction, Anhui Province Key Laboratory of Embryo Development and Reproductive Regulation, Fuyang Normal University, Fuyang, China
Background Soil 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. Methods A 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. Results 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 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.
