【作者】 王莹莹；

【导师】 陈英旭； 俞洁；

【作者基本信息】 浙江大学 ， 环境工程， 2012， 硕士

【摘要】 环境污染的加剧导致茶叶质量问题日益凸显,重金属铅含量超标已经成为制约茶业健康发展的主要因素之一。研究表明,土壤是茶叶铅污染的主要来源,茶园土壤铅污染控制对于解决茶叶铅污染,甚至农产品安全等问题具有重要的现实意义。本文以浙江大学茶树种质资源圃的八个品种茶树根区土壤作为主要研究对象,采用改良的kumada方法提取腐殖质组分,重铬酸钾.分光光度法测定腐殖质组分含碳量。结合课题组前期土壤铅形态和茶树铅含量的研究成果进行相关性分析,研究了不同品种茶树根区土壤的腐殖质组分含量差异,及其与土壤铅形态和茶树组织中铅含量的关系。结果发现,不同品种茶树根区的总有机碳、胡敏酸含量差异较小,而水溶性物质、富里酸、胡敏素的差异较大；根区土壤腐殖质组分与交换态铅含量、茶树老根的铅含量之间存在显著相关性；根区土壤可溶性腐殖质与叶片铅含量呈显著正相关关系。研究结果可为调控茶树根区土壤铅生物有效性提供理论依据,对于提高铅污染土壤茶叶质量具有一定的指导意义。更多还原

【Abstract】 With the increasing environmental pollution, the problem of tea quality is getting worse and worse. The excessive lead in tea has become one of the main factors that constrain the development of tea production. It have been studied that the soil is the main source that courses lead pollution of tea, and the control of lead contamination in tea garden is of great significance for the solution of tea lead contamination problem, which also have practical significance for the safety of other agriculture products.In this article, eight soil samples from eight tea plants were employed as research object, which are collected from the tea garden in Zhejiang University. The developed method, Kumada, was used to extracted humus, and the concentration of carbon is determined by Potassium dichromate-Spectromphotometry method. According to our previous analysis of thecontent of lead in different variety of tea plant root soil, it is found that there was little variation among the content of total organic carbon and humic acid of eight different soil samples, while the content of water-soluble substance, fulvic acid and humin show significant differences, and the content of humus composition was significantly correlated with the content of exchangeable lead and old root. The correlation between the content of soluble humus and the content of tea lead is positive.The research results can provide scientific basis for the control of tea plant root bioavailability lead, and have a meaning of guidance for the improvement of tea product quality.更多还原