Effects of maize (Zea mays L.) growth and photosynthesis on δ13C in soil respiration

作     者：YANG Lanfang CAI Zucong QI Shihua 

作者机构：School of Resource and Environmental ScienceHubei UniversityWuhan 430062China State Key Laboratory of Soil and Sustainable AgricultureInstitute of Soil ScienceChinese Academy of SciencesNanjing 210008China School of Environmental StudiesChina University of GeosciencesWuhan 430074China 

出 版 物：《中国高等学校学术文摘·农学》 (FRONTIERS OF AGRICULTURE IN CHINA)

年 卷 期：2007年第1卷第4期

页      面：405-410页

学科分类：1002[医学-临床医学] 100214[医学-肿瘤学] 10[医学] 

基　　金：This project was financially supported by the National Distinguished Young Scholar (No.40125004) awarded by the National Natural Science Foundation of China,Knowledge Innovation Project of Chinese Academy of Sciences(KZCXI-01-05) China Postdoctoral Science Foundation(2005038220) 

主　　题：maize growth photosynthesis soil respiration δ13C 

摘      要：As a safe,stable and practical labeling method,the natural abundance of 13C has been widely used in a carbon cycle in the soil-plant *** order to understand the effects of maize growth and photosynthesis on the value of δ13C in soil respiration,the value of δ13C in soil respiration was determined by mass spectrum after being trapped in a NaOH solution under a closed static chamber and then turned into barium carbonate in a pot *** results showed that maize growth and photosynthesis significantly affected the value of δ13C in the soil *** maize-planted soil,the value of δ13C in soil respiration had a clear seasonal *** changed with maize growth in the range of-14.57‰ to -12.3‰ and decreased during the period of trumpetingripeningflowering *** difference of δ13C in soil respiration during various maize growth stages added up to about 2.3‰.However,in bare soil,δ13C in soil respiration ranged from -19.34‰ to -19.13‰ and did not change significantly over *** δ13C in soil respiration in the maize-planted soil was the lowest at flowering *** was mainly due to the decline of the input in assimilates into soil and the decrease in root ***,the δ13C increased at ripening stage,due to the decomposition and ingestion of senescent and died roots by soil *** the planted soil,δ13C in soil respiration was significantly higher during daytime than at nighttime at flowering and ripening *** difference of δ13C in soil respiration between day and night periods added up to about 1.4‰ and 2.1‰ at flowering and ripening stages,*** maize plants at the trumpeting stage decreased the value of δ13C in soil respiration *** difference of δ13C in soil respiration between the treatment of non-shading and shading plants added up to 2.85‰.It was concluded that δ13C in soil respiration was remarkably controlled by the maize growth and photosynthesis in planted *** respiratio