title: [Organic carbon decomposition rate in different soil types].
abstract: With incubation experiment, this paper studied the decomposition rate of organic carbon in black soil, fluvo-aquic soil, and red soil. It was shown that these three soil types had significantly different decomposition rate constant of organic carbon (P < 0.05 ), with the corresponding value being 2.2 x 10(-4) x d(-1), 6.0 x 10(-4) x d(-1), and 3.4 x 10(-4) x d(-1), respectively. The decomposition rate constant had a significant correlation with soil pH, which was increased greatly when the soil pH was < 5.5 or > 8.0, and a significant negative correlation with the contents of soil clay and silt, indicating that soil clay and silt content was one of the dominant factors affecting the decomposition rate of organic carbon in these soil types.
authors.affiliation: State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China. yunfengyin@163.com
authors.forename: Yun-Feng
authors.initials: YF
authors.lastname: Yin
authors.forename: Zu-Cong
authors.initials: ZC
authors.lastname: Cai
mesh_terms: D002244:Carbon / Q000032:analysis* / Q000737:chemistry; D018556:Crops, Agricultural / Q000254:growth & development; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D009930:Organic Chemicals / Q000032:analysis* / Q000737:chemistry; D012987:Soil / Q000032:analysis*
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon