泸州烟区土壤有机质和全氮空间变异特征及其影响因素  

Spatial Variability of Soil Organic Matter and Total Nitrogen in Tobacco Production Area of Luzhou and Its Influencing Factors

作　　者：肖怡[1] 李珊[1] 李启权[1] 王昌全[1] 李斌[2] 余亮志 

机构地区：[1]四川农业大学资源学院,四川成都611130 [2]四川省烟草公司,四川成都610041

出　　处：《西南农业学报》2016年第8期1924-1931,共8页Southwest China Journal of Agricultural Sciences

基　　金：中国烟草总公司四川省公司重点科技项目(SCYC201402006)

摘　　要：根据泸州烟区199个土壤采样点数据,采用地统计学和回归分析方法对其植烟土壤有机质和全氮空间变异特征及其影响因素进行分析,为区域土壤有机质和全氮的调控提供科学依据。结果表明,研究区土壤有机质和全氮含量范围分别为5.00~81.50和0.45~3.61 g·kg^(-1),变异系数分别为43.31%和31.98%,均属于中等强度的空间变异性。半方差分析表明,土壤有机质和全氮的块金系数分别为0.402和0.385,说明两个指标具有中等强度的空间自相关性,其空间变异受结构因素和随机因素共同影响。空间插值结果得出,研究区南部土壤有机质和全氮含量总体高于北部。成土母质、土壤类型、海拔和熟制对土壤有机质含量变异的独立解释能力分别为4.6%、0.3%、32.0%和3.0%,对土壤全氮含量变异的独立解释能力分别为5.5%、2.5%、35.4%和13.2%;海拔因素是影响有机质和全氮含量变异的主控因素。研究区应根据不同影响因素下的养分状况,合理调控有机肥和氮肥的施用。Spatial variability of soil organic matter and total nitrogen in the south part of Luzhou were analyzed using Geostatistics methods. The effects of the influencing factors were quantified hy regression analysis based on 199 soil samples. This study provides a theory basis for scientific regulation of soil organic matter and total nitrogen in tobacco-growing areas of Luzhou. Results showed that the eoncentration of soil organic matter and total nitrogen ranged from 5.00 to 81.50 and 0.45 to 3.61 g · kg^-1 respectively, the variation coefficient of soil organic matter and total nitrogen were 43.31% and 31.98 % respectively with moderate variability. The semi-variogram analysis showed that the nugget to sill ratio of soft organic matter and total nitrogen were 0.404 and 0. 378 respectively, which suggested that soil organic matter and total nitrogen had moderate spatial correlation and their spatial variability were determined by structural and random factors. Kriging interpo- lation maps indicated that both the soil organic matter and total nitrogen showed a decreasing trend from south to north. Soil parent material, soil type, attitude and cropping system respectively contributed to 4.6 % ,0.3 % ,32.0 % and 3.0 % of soil organic matter variability and respectively contributed to 5.5 % ,2.5 % ,35.4 % and 13.2 % of total nitrogen variability. Altitude was the dominant factor that influenced the variability of soil organic matter and total nitrogen content. Scientific management should be adopted to manage organic and nitrogen fertilizer in soil according to the status of organic matter and total nitrogen content of different influencing factors.

关 键 词：有机质 金氮 空间变异 地统计学 影响因素 

分 类 号：S158[农业科学—土壤学]