【摘要】 为查明保山市植烟土壤交换性镁含量基本状况,提高烤烟测土配方施肥的科学性,2017年采集了保山市腾冲、昌宁、隆阳、施甸、龙陵5个县(市、区)587个土壤样品,检测与分析其土壤pH、有机质、速效氮和交换性镁含量。结果表明:保山5个县(市、区)植烟土壤镁含量平均值为224.50mg/kg,95%置信区间在209.26～239.47mg/kg,处于中高含量;不同县(市、区)之间的土壤交换性镁含量分布规律明显,呈块状分布,其中腾冲市板块处于低含量水平,龙陵县和昌宁县板块处于中低水平,隆阳区和施甸县板块处于中高水平。土壤pH与交换性镁含量呈极显著正相关,交换性镁含量随pH升高而升高。土壤有机质含量与交换性镁含量呈极显著负相关,随着植烟土壤有机质含量的升高交换性镁含量呈先升后降的趋势,拐点为有机质含量40mg/kg。更多还原

【Abstract】 The pH,organic matter content,rapidly available nitrogen content and exchangeable Mg content of 587 soil samples collected from tobacco-growing soils of Tengchong,Changning,Longyang,Shidian and Longling County(City,District)in Baoshan City were determined to find out the basic status of exchangeable Mg content in tobacco-growing soil and improve the scientificity of testing soil for formulated fertilization in tobacco production.Result:The average Mg content of tobacco-growing soil is224.50 mg/kg and 95% confidence interval is between 209.26 mg/kg and 239.47 mg/kg with a middlehigh level.The content of exchangeable Mg has an obvious distribution rule with a clustered distribution pattern among five counties.The exchangeable Mg content in tobacco-growing soil from Tengchong City,Longling and Changning County,and Longyang and Shidian County is at a low level,middle-low level,and middle-high level respectively.There is a very significant and positive relation between soil pH and exchangeable Mg content and the exchangeable Mg content rises with soil pH increase.The soil organic matter content is negatively related to exchangeable Mg content very significantly.The exchangeable Mg content in tobacco-growing soil shows a first rising and then declining trend with increase of organic matter content and its inflection point is 40 mg/kg.更多还原