大理州植烟土壤有效锌分布特征及其影响因素分析

为明确大理州植烟土壤有效锌的分布特征、合理调控土壤锌平衡,采集并分析了1 131个土壤样品。结果表明:①大理州植烟土壤有效锌含量平均为3.11 mg/kg,变幅为0.07~72.92 mg/kg,变异系数146.95%,只有少部分烟区土壤缺锌,具体分布在云龙、永平、漾濞、祥云、巍山和宾川6个县;②不同类型植烟土壤有效锌含量依次为紫色土 >水稻土>红壤>新积土>黄壤;③不同海拔高度植烟土壤有效锌分布依次为高海拔(>2 100 m)>低海拔(<1 700 m)>中海拔(1 700~2 100 m);④pH在5.0~7.0范围内的土壤有效锌含量较高,比例占总样品数的70.55%;⑤土壤有效锌含量随土壤有机质含量的增加而提高。 

Distribution of Available Zinc in Dali Tobacco Growing Soil and its Influencing Factors

In order to better know the distribution of available zinc in Dali tobacco growing soil and control zinc balance in soil reasonably,1 131 soil samples were collected and analyzed.The results showed that:1) The average content of available zinc was of 3.11 mg/kg ranged from 0.07 to 72.92 mg/kg with a variation coefficient of 146.95%.Only Yunlong,Yongping,Yangbi,Xiangyun,Weishan and Binchuan counties were zinc-deficient.2) Soil types in the order of available zinc content were purple soil >paddy soil >red soil >alluvial soil >yellow soil.3) By altitudes,the order of available zinc content were high altitude(>2 100 m)>low altitude(<1 700 m)>medium altitude(1 700-2 100 m).4) Soil with pH of 5.0-7.0 was of higher available zinc content,which accounted for 70.55% of all samples.5) The content of available zinc increased with the increase of organic matter content in soil.