Warming depleted the δ13CO2 values of soil respiration and accelerated the loss of the light fraction of SOC

Prof. Chunsheng Hu1, Dr. Jiazhen  Li1

1Center For Agricultural Resources Research, Institute Of Genetics And Developmental Biology, Chinese Academy Of Sciences, Shijiazhuang,, China

The carbon storage of soil organic matter is about three times as much as the atmosphere or terrestrial vegetation. The pool of soil organic carbon (SOC) is sensitive to climate change, but the response of different components (light fraction and heavy fraction) of SOC to climate change is still not well understood. In order to study the effect of global warming on SOC dynamics, infrared radiation heater was installed in 2008 to simulate global warming and increased the soil temperature of 5cm depth by about 2℃ in Luancheng Agroecosystems Experimental Station, Chinese Academy of Sciences, in the North China Plain. There are four treatments: no nitrogen and no warming (N0T0), no nitrogen and warming (N0T1), nitrogen and no warming (N1T0) and nitrogen and warming (N1T1) in the field expeirment. During 2016 to 2017, we studied the impacts of experimental warming  on the SOC decomposition in wheat field by measuring the SOC contents, CO₂ fluxes (soil respiration), δ¹³C abundance of SOC and δ¹³CO₂. The results show that warming increased CO₂ emissions and decreased δ¹³CO₂ values of soil respiration, especially in winter. Warming increased the δ¹³C value of SOC, decreased SOC contents and accelerated the loss of the light fraction of SOC.


My field focus on the understanding responses and adaptation of main ecological processes, such as Carbon, Nitrogen and Water cycling, Soil microbial community composition, and Crop productivity, to climate change and intensive human activities, and developing environmentally-sound management practices for increased sustainability, soil quality, and high productivity in farmland ecosystems.

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