The effects of elevated CO2 and temperature on soil organic carbon and total nitrogen contents and mineralization in the 0 to 50 cm paddy soil layer were masked by different land use history

• DOI: 10.1016/j.soisec.2024.100147
• Publication Date: 2024-05-18T16:12:35Z
• Authors: Shuirong Tang; Weiguo Cheng; Samuel Munyaka Ki...; Keitaro Tawaraya; Takeshi Tokida; Mayumi Yoshimoto; Hidemitsu Sakai; Yasuhiro Usui; Hirofumi Nakamura; Miwa Y. Matsushima; Xingkai Xu; Toshihiro Hasegawa
• Keywords: Soil carbon; Carbon fibers

Global warming can accelerate soil organic matter (SOM) decomposition resulting in faster carbon loss and positive climate-C feedback. Previous studies on response of SOM to climate change mainly focus plow layer. However, the effects elevated CO2 (SOC) total nitrogen (TN) contents mineralization are rarely studied subsoil In this study, samples were collected from 0–50-cm paddy layer Tsukuba free-air enrichment experimental site with (+200 ppm) (+2 °C), Japan, after 5-year rice growth season. The amounts SOC, TN, δ13C, δ15N analyzed. A 4-week anaerobic incubation experiment was conducted measure C N potentials. Due intrinsic variation SOC TN layers fields, potentials could not be determined here. effect δ13C only found 0‒10-cm profiles, significant correlations observed among δ15N, decomposed mineralized N, C. variables associated pools, dynamics showed large spatial heterogeneity within field, due original land use history. Therefore, great caution should exercised when evaluating temperature sequestration profiles.