[Near infrared spectroscopy in determining organic carbon and total nitrogen in black soil of Northeast China].
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.
Shen
Yan
Y
Northeast Institute of Geography and Agroecology, Chinese Academy of Sciences, Changchun 130012, China. czh-5852@hotmail.com
Zhang
Xiao-Ping
XP
Liang
Ai-Zhen
AZ
Shi
Xiu-Huan
XH
Fan
Ru-Qin
RQ
Yang
Xue-Ming
XM
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
D009930:Organic Chemicals; D012987:Soil; D002244:Carbon; D009584:Nitrogen