摘要
探明土壤中微量元素的丰缺状况及空间分布规律，为精准施用中微量元素肥料提供科学依据．以16 m间距的“网格法”取耕层（0～20 cm ）土样289个，测定了8种元素含量．结果表明，该试验站内土壤有效铁、钙和铜含量普遍较为丰富，有效锰和锌属中等含量，有效镁和硫从低至高均有分布，水溶性氯较为缺乏．土壤有效锌与其余元素间均存在极显著相关性，其它元素间也存在较为显著的相关性．各元素的最佳理论模型均为指数模型，土壤中微量元素变程在56.10～507.90 m之间．土壤有效镁的空间自相关性最强，水溶性氯的空间自相关性最弱．土壤中微量元素含量以东北部含量较高，中部及西南部分区域含量较低．铁、锰、铜和锌的空间分布特征较为相似，氯空间分布较为复杂．针对烤烟而言，该试验站土壤有效锌和有效锰含量属于中等偏高，有效铜含量为高或极高，有效铁含量极高，水溶性氯含量仅为1.56～2.27 m g／kg ，属严重缺乏．该区域种烟时必须适量补氯．
In order to provide a solid foundation for scientific application of medium and trace elements in tobacco‐grown soil ,289 soil samples were collected from the top soil layer （20 cm） of the study area based on an approximately 20 m grid and the contents of 8 elements were analyzed .The results showed that the contents of available Fe ,Ca and Cu were relatively abundant ,the contents of available Mn and Zn were at a moderate level ,the distribution of available Mg and S in the study area was inconsistent ,being abundant at some sites and deficient at others ,and water‐soluble Cl was generally deficient .Soil available Zn was found to be in highly significant correlations with the other 7 elements ,between which a significant corre‐lation existed .The optimal theoretical models of the elements studied were all exponential models .The range of their spatial dependence varied from 56.10 to 507.90 m .Soil available Mg had the strongest spa‐tial dependency ,and water‐soluble Cl had the weakest .The maps of the distribution of soil variables showed that all of the elements had high content in the northeast ,and low content in the middle and south‐west parts of the study area .Fe ,Mn ,Cu and Zn shared similar spatial distribution ,while the spatial dis‐tribution of Cl was rather complex .With flue‐cured tobacco cultivation taken into consideration ,the soil of the study area was characterized by medium or high available Zn and Mn ,abundant or highly abundant a‐vailable Cu ,highly abundant available Fe and highly deficient water‐soluble Cl .It is ,therefore ,concluded that Cl should be supplied at an appropriate rate in this area if tobacco is to be cultivated .
出处
《西南大学学报（自然科学版）》
CAS
CSCD
北大核心
2014年第12期12-17,共6页
Journal of Southwest University(Natural Science Edition)
基金
重庆市烟草专卖局项目:重庆烟区不适用鲜烟叶优化技术研究资助(NY20130501070003)
关键词
植烟土壤
中微量元素
空间变异性
tobacco-grow n soil
medium and trace element
spatial variability
