Saturday, 15 July 2006

Distribution of Soil Organic Carbon and Total Nitrogen in Mollisol in the Northeast of China.

Xie Hongtu and Zhang Xudong. Institute of Applied Ecology, Chinese Academy of Sciences, No.72 Wenhua Road, Shenyang, Liaoning Province, China,110016, Shenyang, China

The spatial distribution of soil organic carbon(SOC) and total nitrogen(TN) and their properties were studied in this paper. 1100 samples were collected at Mollisol region in the northeast of China in Oct. 2002. Spatial distribution patterns of SOC and TN and the relationships between SOC, TN, latitude and texture were analyzed. The status and distribution of SOC and TN are systematically studied after China's second national soil survey. It is conceded that the distribution of SOC and TN were determined by temperature changing with the latitude and precipitation with the longitude as the outside factors, and by texture as the inside factor. The contour plots of SOC and TN were drawn. The detail results were shown as follow: 1. The horizontal distribution of SOC and TN were controlled by temperature changing with the latitude in the whole Mollisol region and precipitation with the longitude in a given region. The relations of SOC with latitude and clay were positive with correlation coefficients(r2) of 0.51 and 0.43 respectively at P<0.01 levels. The relation between SOC and sand was negative with correlation coefficient 0.44 at P<0.01 levels. 2. The vertical distributions of SOC and TN in Mollisol were mainly determined by temperature in the definite depth. The effects of precipitation and clay were relatively less. The concentration of SOC and TN decreases with depth.

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