缓坡植烟田土壤微量元素的空间变异特征  

Spatial variability of soil trace elements in gentle slope tobacco field

作　　者：常栋[1] 徐明康[2] 王勇 钱宇[2] 刘挺[3] 叶协锋[1] 刘国顺[1] 

机构地区：[1]河南农业大学烟草学院/国家烟草栽培生理生化研究基地,郑州450002 [2]四川省烟草公司凉山州公司,西昌615000 [3]四川省烟草公司凉山州公司会理营销部,会理615100

出　　处：《中国烟草学报》2012年第3期34-41,共8页Acta Tabacaria Sinica

摘　　要：采用地统计学和地理信息系统(GIS)相结合的方法,对典型缓坡植烟田土壤有效微量元素含量的空间变异规律进行研究,并运用普通克里格(Kriging)进行最优无偏线性估计,绘制空间分布图。结果表明,研究区域4种微量元素含量均属于中等程度变异,变异性大小表现为Zn>Mn>Fe>Cu。土壤Fe和Zn的最适模型为指数模型;Mn和Cu为球状模型。土壤Cu和Zn块金系数分别为20%、23.7%,具有强烈的空间相关性;Fe和Mn为28%和43.5%,具有中等程度的空间相关性。各向异性分析表明,土壤Cu存在较强烈的各向异性,Mn的各向异性则较小。研究区4种土壤元素含量的低值均出现在坡度大的中北部,东北部较平缓的区域含量则较高;同一坡向下,坡度是影响微量元素含量空间分布的重要地形因素。因此,在山地烟田精准施肥决策中应考虑坡度等地形因素对微量元素空间变异的影响。Spatial variability of soil trace elements in typical gentle slope tobacco field was analyzed by geostatistics method with Geographic Information System （GIS） platform. Spatial distribution of trace elements were built by ordinary Kriging - a linear unbiased interpolation method. Results showed that spatial variability of soil trace elements were all at moderate level in the whole region studied, and the sequence was in an order of Zn 〉 Mn 〉 Fe 〉 Cu. Fe and Zn were modeled best with exponential models, whereas Cu and Mn with spherical models. Cu and Zn were strongly dependent with nugget/still ratios at 20% and 23.7%, respectively; Fe and Mn were moderately dependent with nugget/still ratios at 28% and 43.5%, respectively. Further analysis showed that Cu was highly anisotropic while Mn was feebly aniso-tropic. The four elements in soil were low in north central region with deep slope, while high in northeast where the slope was relatively flat. Slope was important for spatial distribution of trace elements. It was suggested that effects of terrain factors on spatial variability of trace elements should be incorporated in accurate fertilizer decisions with mountain tobacco field.

关 键 词：空间变异 地统计学 微量元素 缓坡植烟田 

分 类 号：S158[农业科学—土壤学]