土壤CEC的影响因子及Cokriging空间插值分析——以青岛市大沽河流域为例
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国家自然科学基金项目(40771095)和青岛市水利科技项目(2006-003)共同资助


Influencing factors and cokriging spatial interpolation analysis of soil cation exchange capacity—A case study of Dagu River Basin,Qingdao City
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    摘要:

    运用地统计和多元回归分析方法,探讨大沽河流域土壤阳离子交换量(CEC)的空间变异和影响因子。结果表明,上下层土壤CEC与有机质、黏粒和粉粒含量有着显著的正相关,而与砂粒含量则存在显著的负相关,其中与黏粒含量的相关系数最大,与粉粒含量的相关性最弱;对CEC的贡献能力依次为黏粒>有机质>砂粒, 黏粒的贡献能力平均为有机质的1.5~2.5倍;以黏粒为辅助变量的Cokriging(COK)较之Ordinary Kriging(OK)能提高插值精度,上下层均方根误差RMSE值分别减少了18.94%和41.05%,辅助变量与主变量的相关程度决定了估值的精度;大沽河流域中东、西北部及西南方向中部地区土壤CEC较高,而北部与西南角局部地区土壤CEC保肥能力非常弱,是以后土壤改良的重点地区,可通过增施有机肥以及改土培肥等措施来提高土壤肥力水平.

    Abstract:

    Spatial variation and influencing factors of CEC of the soil in the Dagu River Basin were studied with geostatistical and multiple regression analysis methods. Results show that CEC of the soil in the upper and under layers displayed significant positive correlations with organic matter, clay and silt, and significant negative correlation with sand. The correlation coefficient was the biggest between CEC and clay, and the smallest between CEC and silt. In terms of contribution of the factors to CEC, they were in the order of clay > organic matter > sand, and the mean contribution of clay was 1.5~2.5 times as much as that of organic matter. The cokriging method, which used clay as instrumental variable, produced more accurate results than the ordinary kriging method, and reduced RMSE of the soils in the upper and under layers by 18.94% and 41.05%, respectively. Furthermore, the relationship between the secondary and the primary variables governed accuracy of the estimation. Soil CECs were higher in the middle east, northwest and middle southwest of the Dagu River Basin, but much lower in the north and southwest tip. Hence the two regions are critical ones for soil amelioration. The soil fertility therein can be improved by increasing application of organic manure and adopting other soil building practices.

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廖凯华,徐绍辉,程桂福,林青.土壤CEC的影响因子及Cokriging空间插值分析——以青岛市大沽河流域为例[J].土壤学报,2010,47(1):26-32. DOI:10.11766/trxb200805270105 Liao Kaihua, Xu Shaohui, Cheng Guifu, Lin Qing. Influencing factors and cokriging spatial interpolation analysis of soil cation exchange capacity—A case study of Dagu River Basin, Qingdao City[J]. Acta Pedologica Sinica,2010,47(1):26-32.

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