四川凉攀烟区植烟土壤有效铜和有效锌空间变异特征

微量元素不仅影响烟叶生长发育及烟叶产质量，且它们之间存在相互促进或拮抗作用。为了合理施用微肥，提高烟田合理施肥管理水平，改善烟叶产质量，采用地统计和GIS技术相结合的方法，研究了凉攀烟区植烟土壤有效态Cu、Zn的空间变异。结果表明，研究区植烟土壤有效态Cu含量比较丰富，有效Zn含量适中，分别为2.83、1.86 mg/kg。受地形、气候环境影响，不同县域有效态Cu、Zn含量差异较大。水稻土和黄壤有效Cu、Zn含量明显高于紫色土。两种微量元素与海拔呈负相关性。有效态Cu、Zn含量空间变异距离分别为50、25 km，属于中等强度空间变异，受土壤类型等结构因素和施肥等随机性因素的共同影响。空间插值分析结果表明，有效态Cu、Zn含量总体上呈斑块状分布，区域差异性明显。

Spatial Variability Characteristics of Available Cu and Zn in Tobacco Planting Soils in Liangshan and Panzhihua,Sichuan Province

Micro nutrients not only influence tobacco growth, yield and quality, and take the positive or antagonistic effects for each other sometimes. In order to apply micronutrients properly in tobacco production, and provide scientific information for improving the yield and quality of tobacco, geostatistics and GIS were used to study the spatial variability characteristics of available Cu and Zn in tobacco planting soils in Langshan and Panzhihua. The result indicated that the average content of available Cu was abundant, and the average content of available Zn is moderate, which were respectively 2.83 and 1.86 mg/kg. Available Cu and Zn contents varied largely among counties due to differences in topography and climate. The available Cu and Zn contents were higher in paddy and yellow soils than those in purplish soil, and were negatively correlated with elevation. The spatial variation distance of available Cu and Zn were 50 and 25 km, respectively, which belonged to moderate intensity spatial variation, which was influenced by structural factors like soil type and random factors like fertilizer. Interpolation results indicated that the content of available Cu and Zn distributed in patch shape as a whole, but distributions of their high value area and low value area were obviously different.