Spatial simulation of topsoil TN at the national scale in China
Received date: 2010-01-19
Revised date: 2010-04-26
Online published: 2010-11-20
Based on 5336 typical soil profiles collected during the second national soil survey period, the correlation between topsoil total nitrogen (A horizon) and 11 environmental factors were analyzed and spatial distribution of topsoil nitrogen (TN) at national scale in China was simulated with the combination of multiple regression model and HASM model. Results indicated that, mean absolute error and mean relative error of the predicted value for 350 validation points were 0.67 g·kg-1 and 61.06%; compared with ordinary kriging method, the two errors were reduced by 0.05 g·kg-1 and 17.53% respectively. Besides, simulation result for northwest China, where the density of sample points was much smaller, was much closer to the actual situation. Thus, a combined method of multiple regression model and HASM model, which took the influence of environmental factors into account, can be used as an effective method for simulating spatial distribution of soil properties at a large scale.
Key words： HASM method; soil nitrogen; national scale; spatial simulation
LI Qi-quan, YUE Tian-xiang, FAN Ze-meng, DU Zheng-ping, CHEN Chuan-fa, LU Yi-min . Spatial simulation of topsoil TN at the national scale in China[J]. GEOGRAPHICAL RESEARCH, 2010 , 29(11) : 1981 -1992 . DOI: 10.11821/yj2010110007
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