首页|期刊导航|中国地球化学学报（英文版）|Stable carbon isotopic composition of soil organic matter in the karst areas of Southwest China
中国地球化学学报（英文版）2008，Vol.27Issue(2)：171-177,7.
Stable carbon isotopic composition of soil organic matter in the karst areas of Southwest China
Stable carbon isotopic composition of soil organic matter in the karst areas of Southwest China
摘要
Abstract
This study dealt with the distribution characteristics of soil organic carbon (SOC) and the variation of stable carbon isotopic composition (δ13C values) with depth in six soil profiles, including two soil types and three vegetation forms in the karst areas of Southwest China. The δ13C values of plant-dominant species, leaf litter and soils were measured using the sealed-tube high-temperature combustion method. Soil organic carbon contents of the limestone soil profiles are all above 11.4 g/kg, with the highest value of 71.1 g/kg in the surface soil. However, the contents vary between 2.9 g/kg and 46.0 g/kg in three yellow soil profiles. The difference between the maximum and minimum δ13C values of soil organic matter (SOM) changes from 2.2‰ to 2.9‰ for the three yellow soil profiles. But it changes from 0.8‰ to 1.6‰ for the limestone soil profiles. The contrast research indicated that there existed significant difference in vertical patterns of organic carbon and δ13C values of SOM between yellow soil and limestone soil. This difference may reflect site-specific factors, such as soil type, vegetation form, soil pH value, and clay content, etc., which control the contents of different organic components comprising SOM and soil carbon turnover rates in the profiles. The vertical variation patterns of stable carbon isotope in SOM have a distinct regional character in the karst areas.关键词
stable carbon isotope/ soil organic matter/ δ13C value/ karst areaKey words
stable carbon isotope/ soil organic matter/ δ13C value/ karst area分类
天文与地球科学引用本文复制引用
ZHU Shufa,LIU Congqiang..Stable carbon isotopic composition of soil organic matter in the karst areas of Southwest China[J].中国地球化学学报（英文版）,2008,27(2):171-177,7.基金项目
This study was financially supported by the Scientific Research Foundation of Henan University of Science and Technology for Talents (No.06-12). （No.06-12）
