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[1]SU Zhizhu,LIU Rong,LIANG Aimin,et al.Study on Soil Mechanical Composition and Organic Matter of Desertification Land in Northwest of Shanxi Province[J].Research of Soil and Water Conservation,2018,25(06):61-67.

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Study on Soil Mechanical Composition and Organic Matter of Desertification Land in Northwest of Shanxi Province

Research of Soil and Water Conservation[ISSN 1005-3409/CN 61-1272/P] Volume: 25 Number of periods: 2018 06 Page number: 61-67 Column: Public date: 2018-10-26

Title:: Study on Soil Mechanical Composition and Organic Matter of Desertification Land in Northwest of Shanxi Province

Author(s):: SU Zhizhu¹, LIU Rong², LIANG Aimin³, MA Yijuan², WANG Guoling⁴, GAO Junliang⁵, HA Si⁶; 1. Historical Culture School, Shanxi University, Taiyuan 030006, China;
2. College of Geography Science, Taiyuan Normal University, Jinzhong, Shanxi 030619, China;
3. Northwest Institute of Eco-environment and Resources, Chinese Academy of Sciences, Lanzhou 730000, China;
4. College of Environment and Resources, Shanxi University, Taiyuan 030006, China

Keywords:: desertification land; soil mechanical composition; organic matter; northwest of Shanxi Province

CLC:: S152.3;S153.6

DOI:: -

Abstract:: Northwest of Shanxi Province is one of the severe desertification areas in northern China. The samples of topsoils (0—20 cm) and subsoils (20—40 cm) collected from cropland, planted forest land and wasteland in the northwest of Shanxi Province, were analyzed for particle sizes and organic matter in the laboratory. The results showed that the contents of particle sizes decreased in order: silt (0.002～0.05 mm) > very fine sand (0.05～0.1 mm) > fine sand(0.1～0.25 mm) > clay (< 0.002 mm) in the study area, and the content of > 0.5 mm particle size was very few. The contents of dominant size fractions which were silt, very fine sand and fine sand exceeded 90%. The soil mechanical composition was not significant difference between topsoil and subsoil in cropland due to plowing; the fractions of topsoil was finer than subsoil in the planted forestland because of the function of dispersing soil parent material of herbage which were grown in the topsoil under forest; and the soil in wasteland was less covered by vegetation layer in the winter and early spring when the wind erosion is the strongest in the year. The contents of organic matter from different land types in this area appeared greater in the topsoils than subsoils. The content of organic matter decreased in the order: cropland > wasteland > planted forest land. In terms of correlativity between soil mechanical composition and the content of organic matter, the fine particles (silt and clay) are positively correlated with the content of organic matter, while the coarse particles (fine sand and very fine sand) are negatively correlated with the content of organic matter. From the viewpoint of relevance degree, silt and fine sand are significantly positively and negatively correlated with the content of organic matter, respectively, which indicates that silt and fine sand are the key size fractions determining the organic matter accumulation.

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