地理科学 ›› 2013, Vol. 33 ›› Issue (1): 83-89.doi: 10.13249/j.cnki.sgs.2013.01.83

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苏中平原南部土壤有机质空间变异特征研究

赵明松1,2(), 张甘霖1(), 李德成1, 赵玉国1, 王德彩1,2   

  1. 1.土壤与农业可持续发展国家重点实验室 中国科学院南京土壤研究所, 江苏 南京 210008
    2.中国科学院研究生院, 北京 100049
  • 收稿日期:2012-03-25 修回日期:2012-06-10 出版日期:2013-01-20 发布日期:2013-01-20
  • 作者简介:

    作者简介:赵明松(1983-),男,安徽淮南人,博士研究生,主要从事数字土壤制图和土壤空间变异研究。E-mail:mszhao@issas.ac.cn

  • 基金资助:
    江苏省基础研究计划(BK2008058)、科技部国际科技合作项目(2010DFB24140)、中国科学院战略性先导科技专项子课题(XDA0505050303)资助

Spatial Variability of Soil Organic Matter and Factor Analysis in the South of Middle Jiangsu Plain

Ming-song ZHAO1,2(), Gan-lin ZHANG1(), De-cheng LI1, Yu-guo ZHAO1, De-cai WANG1,2   

  1. 1.State Key Laboratory of Soil and Sustainable Agriculture, Institute of Soil Science, Chinese Academy of Sciences, Nanjing, Jiangsu 210008, China
    2.Graduate University of Chinese Academy of Sciences, Beijing 100049, China
  • Received:2012-03-25 Revised:2012-06-10 Online:2013-01-20 Published:2013-01-20

摘要:

在江苏省中部平原南部选取一个30 km×45 km方形区域为研究区,按照套合采样方法,采集178个耕作层土样,分析土壤有机质含量和机械组成,运用地统计学和GIS技术研究苏中平原区表层土壤有机质含量空间变异特征,利用相关分析和方差分析探讨区域内土壤有机质含量空间变异的影响因素。统计结果表明,研究区土壤有机质含量为28.51±7.80 g/kg,变异系数为27.31%,属中等变异强度;地统计分析表明,研究区土壤有机质含量存在强烈的空间自相关性,结构变异占主导作用,各向异性显著,在39°和219°方向上变异程度最剧烈,土壤有机质含量自东北向西南呈递减趋势。研究区土壤有机质含量空间变异主要受土壤质地、成土母质、地形等因素影响,其中土壤质地是空间变异的主要影响因素。

关键词: 土壤有机质, 空间变异, 地统计学, 土壤质地, 成土母质

Abstract:

In this research, a square area (32°20′17″-32°44′50″ N,119°53′37″-120°14′4″E), about 1 350 km2, was chosen as a case in the south of the middle Jiangsu plain. A total of 178 soil samples were collected according to nested scenario’s, for the analysis of SOM content and soil mechanical composition. And furthermore, spatial variability of SOM in the surface layer was analyzed using the Geostatistical and GIS method, and its dominating factors, too, by means of correlation analysis and analysis of variance. The result suggested that the SOM content varied in the range of 28.51±7.80 g/kg with a coefficient of variation being 27.31%, a moderate level. Geostatistical analysis suggests that the study area was very strong in spatial autocorrelation and the semi-variogram was best fitted by spherical model, which was significant in anisotropy and the anisotropy ratio was 1.30. The variation at 39° and 219° in direction was the most severe,and the spatial heterogeneity range at the direction was 33.26 km. The variation at 129° and 309° in direction was the slightest,and the spatial heterogeneity range at the direction was 43.08 km. The structural factors played a dominating role in spatial variability of SOM. SOM in the area was distributed in a band, of which high content was in the northeast ,in which the area of more than 30 g/kg accounting for 42% of the total area. But low content was in the southwest part. Correlation coefficients between SOM and soil mechanical composition were -0.548 for sand, 0.534 for silt and 0.259 for clay, respectively, indicating the degree of correlation between SOM and sand was the strongest, followed by silt and clay. Analysis of variance showed that parent material and soil type effected spatial variability of SOM significantly. Soil generated in the lake sediment had higher SOM content than that in the alluvial deposit. Soil type with high in clay and silt content had higher SOM content than that with sand content. Soil mechanical composition played a key role in spatial variability of the study area.

Key words: soil organic matter, spatial variability, Geostatistics, soil texture, parent material

中图分类号: 

  • S159