title: [Near infrared spectroscopy in determining organic carbon and total nitrogen in black soil of Northeast China].
abstract: In this study, near infrared reflectance spectroscopy (NIRS) was used to determine the organic carbon (OC), total nitrogen (TN), and C/N ratio in black soil of Northeast China. Based on the 3699-12000 cm(-1) NIRS of 136 black soil samples collected in 2004-2005, and by using partial least square (PLS), the related quantitative models were established. Leave-one-out cross validation showed that the OC and TN were well predicted, with the values of coefficient of determination (R2) being 0.92 and 0.91, RPD (the ratio of standard deviation of validation set to root mean square error of cross validation) being 3.45 and 3.36, and correlation coefficient (r) being 0.94 and 0.93 respectively, suggesting that NIRS had the potential to predict the OC and TN in black soil of Northeastern China. However, the C/N ratio was poorly predicted, with R2 = 0.61, RPD = 1.61, and r = 0.74, indicating that NIRS could not give reasonable prediction for the C/N ratio in black soil.
authors.affiliation: Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China. czh-5852@hotmail.com
authors.forename: Yan
authors.initials: Y
authors.lastname: Shen
authors.forename: Xiao-Ping
authors.initials: XP
authors.lastname: Zhang
authors.forename: Ai-Zhen
authors.initials: AZ
authors.lastname: Liang
authors.forename: Xiu-Huan
authors.initials: XH
authors.lastname: Shi
authors.forename: Ru-Qin
authors.initials: RQ
authors.lastname: Fan
authors.forename: Xue-Ming
authors.initials: XM
authors.lastname: Yang
mesh_terms: D002244:Carbon / Q000032:analysis*; D002681:China; D009584:Nitrogen / Q000032:analysis*; D009930:Organic Chemicals / Q000032:analysis*; D012987:Soil / Q000032:analysis*; D019265:Spectroscopy, Near-Infrared / Q000379:methods
chemical_list: D009930:Organic Chemicals; D012987:Soil; D002244:Carbon; D009584:Nitrogen