caa a22 4500 60621755X CHVBK 20210128101108.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s11104-015-2414-8 doi (NATIONALLICENCE)springer-10.1007/s11104-015-2414-8 Crop species affect soil organic carbon turnover in soil profile and among aggregate sizes in a Mollisol as estimated from natural 13C abundance [Elektronische Daten] [Yunfa Qiao, Shujie Miao, Na Li, Yanli Xu, Xiaozeng Han, Bin Zhang] Background and aims: Soil organic carbon (SOC) stock varies in soil profiles under different cropping systems, which is possibly due to the difference in SOC turnover rate. This study used a 22-year field experiment to determine the effect of crop species on SOC turnover rate in soil aggregates and profiles of a Mollisol. Methods: Soils were sampled from 2-m soil profiles in 1991 and 2012, from the plough layer regularly under continuous monocropping of maize, soybean and wheat. Natural 13C abundance was determined to calculate the fraction of newly derived C in SOC in bulk soil and water-stable aggregates of different sizes. Results: The SOC content in the plough layer tended to decrease under wheat and maize but did not change under soybean from 1991 to 2012. The soil δ13C abundance in bulk soil and all aggregate sizes increased in 0-1.8m depth under maize but decreased in 0-0.8m under soybean and wheat, with the variations being larger in the larger aggregates. The SOC turnover at 0-0.8m depth was fastest under wheat, followed by soybean and slowest under maize. The SOC turnover was faster in the larger aggregates for all crops, with the variations among the crop species being larger in > 2mm aggregates. Conclusions: Crop species affect the δ13C abundance and SOC turnover rate consistently in different aggregate sizes in the plough layer and in bulk soil within the rooting zone. Springer International Publishing Switzerland, 2015 Organic carbon in deep soil nationallicence Soil aggregates nationallicence Soil organic carbon turnover nationallicence Stable isotope nationallicence Crop species nationallicence Qiao Yunfa Nanjing University of Information Science and Technology, 210044, Nanjing, People's Republic of China aut Miao Shujie Nanjing University of Information Science and Technology, 210044, Nanjing, People's Republic of China aut Li Na National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut Xu Yanli National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut Han Xiaozeng National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut Zhang Bin National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 163-174 0032-079X 392:1-2<163 2015 392 11104 https://doi.org/10.1007/s11104-015-2414-8 text/html Onlinezugriff via DOI BK010053 XK010053 XK010000 Metadata rights reserved Springer special CC-BY-NC licence nationallicence 1 research-article jats NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE 856 40 https://doi.org/10.1007/s11104-015-2414-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Qiao Yunfa Nanjing University of Information Science and Technology, 210044, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Miao Shujie Nanjing University of Information Science and Technology, 210044, Nanjing, People's Republic of China aut NATIONALLICENCE 700 1- Li Na National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Xu Yanli National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Han Xiaozeng National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut NATIONALLICENCE 700 1- Zhang Bin National Observation Station of Hailun Agro-ecology System, Key Laboratory of Mollisols Agroecology, Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, 138 Haping Rd, 150081, Harbin, People's Republic of China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 163-174 0032-079X 392:1-2<163 2015 392 11104