caa a22 4500 606217703 CHVBK 20210128101109.0 cr unu---uuuuu 210128e20150701xx s 000 0 eng 10.1007/s11104-014-2265-8 doi (NATIONALLICENCE)springer-10.1007/s11104-014-2265-8 Tracking the photosynthesized carbon input into soil organic carbon pools in a rice soil fertilized with nitrogen [Elektronische Daten] [Tida Ge, Chang Liu, Hongzhao Yuan, Ziwei Zhao, Xiaohong Wu, Zhenke Zhu, Phil Brookes, Jinshui Wu] Aims: Replenishment of soils with carbon (C) produced during photosynthesis plays an important role in global C cycling. Nitrogen (N) fertilization is critical for rice production, but its effects on the deposition of photosynthesis-derived C into soil C pools is poorly understood. To address this, we used continuous 14C-labeling to quantify the deposition of photosynthesis-derived C into various soil organic pools in a rice-soil system. Methods: Rice (Oryza sativa L.) was continuously supplied with 14C-labeled CO2 (14C-CO2) for 36days, with increasing N fertilizer rates (0 [N0], 10 [N10], 20 [N20], or 40mgNkg−1 soil [N40], respectively). Results: Rice shoot and root biomass significantly increased following N fertilization. The amount of photosynthesis-derived C converted into soil organic carbon (14C-SOC) was proportional to the soil N concentration, and accounted for 8.0-19.3% of rice biomass C. The 14C-SOC content was positively correlated with the rice root biomass, suggesting that N increased root exudation of photosynthesis-derived C. The amounts of 14C-labeled C in the dissolved organic carbon (14C-DOC) and in the microbial biomass carbon (14C-MBC), as proportions of 14C-SOC, were 3.9-7.8 and 6.6-24.0%, respectively. The 14C-DOC, 14C-MBC, and 14C-SOC as proportions of total DOC, MBC, and SOC were 9.7-11.6, 6.9-10.6, and 0.37-1.71%, respectively. Conclusions: Nitrogen fertilization promotes deposition of photosynthesis-derived C into SOC pools in a rate-dependent manner. However, the 14C-MBC as a proportion of both 14C-SOC (14C-MBC/14C-SOC) and MBC (14C-MBC/MBC) increase during rice growth at lower N concentrations. Springer International Publishing Switzerland, 2014 Soil organic C nationallicence Rice nationallicence N application rate nationallicence 14C labeling nationallicence Photo-assimilated C nationallicence Ge Tida Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Liu Chang Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Yuan Hongzhao Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Zhao Ziwei Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Wu Xiaohong Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Zhu Zhenke Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Brookes Phil Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Wu Jinshui Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 17-25 0032-079X 392:1-2<17 2015 392 11104 https://doi.org/10.1007/s11104-014-2265-8 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/s11104-014-2265-8 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Ge Tida Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Liu Chang Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Yuan Hongzhao Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Zhao Ziwei Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Wu Xiaohong Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Zhu Zhenke Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Brookes Phil Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 700 1- Wu Jinshui Changsha Research Station for Agricultural and Environmental Monitoring & Key Laboratory of Agro-ecological Processes in Subtropical Region, Institute of Subtropical Agriculture, Chinese Academy of Sciences, 410125, Hunan, China aut NATIONALLICENCE 773 0- Plant and Soil Springer International Publishing 392/1-2(2015-07-01), 17-25 0032-079X 392:1-2<17 2015 392 11104