测定土壤有效性铁锰铜锌的影响因素及优化方法  

Factors affecting determination of soil available microelement elements and optimization method

作　　者：李小涵[1] 党海燕 董昭芸 王星舒 高玉 王朝辉[1] 石美[1] LI Xiaohan;DANG Haiyan;DONG Zhaoyun;WANG Xingshu;GAO Yu;WANG Zhaohui;SHI Mei(College of Natural Resources and Environment,Northwest A&F University,Yangling 712100,China)

机构地区：[1]西北农林科技大学资源环境学院,陕西杨凌712100

出　　处：《实验技术与管理》2022年第9期76-80,共5页Experimental Technology and Management

基　　金：国家自然科学基金项目(41907123);西北农林科技大学教改项目(JY2103088);西北农林科技大学实验技术研究与实验室管理创新项目(SY20210106);资源环境学院实验专项科研资金(ZHSY2105)。

摘　　要：客观准确地测定土壤有效态微量元素含量对合理施肥和提高作物产量与品质具有重要意义。针对土壤有效态微量元素含量测定结果偏差较大的问题,该文研究了仪器燃烧参数设定和浸提剂pH对土壤有效铁锰铜锌含量的影响。结果表明:燃气流量与助燃气比例会显著影响测定结果,应根据仪器的型号及测定的元素种类调整燃气流量与助燃气比例,以获取较高的测定灵敏度。对于中性和碱性土壤,随着DTPA浸提液pH升高,浸提土壤有效铁、锰、铜和锌的能力下降,选用pH7.0的DTPA浸提液较为适合。随着DTPA浸提液pH升高,对酸性土壤的有效铁和铜浸提能力提高,有效锌变化不显著,有效锰显著下降。因此,酸性土壤的有效铁和铜适合的DTPA浸提液pH为7.3,而有效锰和锌的浸提液pH为7.0较适合。It is of great importance to objectively and accurately determine contents of soil available micronutrients for rational fertilizer application and improvement of crop yield and quality. In order to solve the problem of large deviation in the determination of soil available micronutrient contents, the effects of combustion parameters and pH of extractant on available Fe, Mn, Cu, Zn content in soil are studied. The results show that the combustion gas flow and the supporting gas proportion significantly affect the determination of the micronutrients. The proportion of gas flow and auxiliary gas should be adjusted according to the type of instrument and measured elements, so as to get the suitable sensitivity for determination. For neutral and alkaline soils, DTPA leaching capacity of available fe, Mn, Cu and Zn decreased with the increase of pH, so the DTPA extract with pH7.0 is more suitable. For the acid soil, with the increase of pH of DTPA, the extraction capacity of available Fe and Cu increased, but the change of Zn available is not significant, while the available Mn decreased significantly. Therefore, the suitable pH for DTPA extraction of available Fe and Cu in acidic soil is 7.3, while that of available Mn and Zn is 7.0.

关 键 词：微量元素 仪器参数 浸提液pH 土壤类型 

分 类 号：S151.9[农业科学—土壤学]