Analysis of spatial distribution and main controlling factors of soil organic carbon content and total nitrogen content in Northeast ChinaChinese Full Text
CHEN Changhua;CHEN Xiyun;NIU Jianli;HE Ziyun;School of Geography,Beijing Normal University;
Abstract: The spatial distribution characteristics of soil organic carbon content and soil total nitrogen content in Northeast China were analyzed with the data of Second National Soil Survey using Arc GIS and GS + geostatistics softwares. Simultaneously,we explored the controlling factors and relative importance between human activities and natural factors from 9 natural factors and land use types. The content of soil organic carbon and soil total nitrogen were in the medium level according to the national soil nutrition classification. The semivariogram models of soil organic carbon and total nitrogen were best described by Gaussian model,the Nugget / Sill of them were36. 5% and 43. 76%,respectively,having moderately dependent spatial correlation. Spatial distribution of carbon and nitrogen content decreased gradually from northeast to southwest in this region. Soil organic carbon and total nitrogen had significant positive correlation with cation exchange capacity,longitude,latitude and elevation,had significant negative correlation with average annual temperature,p H and soil thickness,and had no significant correlation with average annual precipitation（ P ＞ 0. 01）. The main controlling factors which affect the spatial variation of soil organic carbon and total nitrogen in the Northeast China were cation exchange capacity,longitude,land use types,p H and average annual temperature. All factors explained 30. 20% and 29. 10% of the organic carbon and total nitrogen content variation,and explanation of land use types represented 10. 96% and5. 82% of total explanation,respectively. Natural factors,especially soil quality,were dominant compared with land use types. Furthermore,human activities including land use may weakened influence of natural factors to some extent in cultivated land.
Keywords：
soil organic carbon; soil total nitrogen; main controlling factors; Northeast China; spatial distribution;
- DOI：
10.13448/j.cnki.jalre.2015.089
- Series：
- Subject：
- Classification Code：
S151.9
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