土壤因子对茶树硒吸收特性的影响

摘要

以中茶108为供试品种，采用盆栽和水培试验，研究了不同土壤硒含量、干旱胁迫以及不同pH值对茶树硒吸收特性的影响。结果表明，茶树硒含量与土壤硒含量呈正相关；干旱胁迫会造成茶树对土壤中硒的吸收速率降低，与正常生长的茶树相比，硒吸收总量显著降低；土壤含水率在90%时，茶树根部对硒的累积总量最高，达到0.527 mg·kg-1，而在土壤含水率50%时，根部硒累积总量为0.301 mg·kg-1，两者差异极显著。在不同pH值的培养条件下，72 h内各处理叶片均达到富硒水平，处理间叶片硒含量未出现显著差异；处理28 d后，各处理间叶片硒含量具有显著差异，以pH值3.5时最高，极显著高于其他各处理。%In order to establish the effects of different soil selenium content, soil moisture content and pHvalueon the seleniumaccumulationin tea plant,Zhongcha 108 wasused asinvestigationmaterials,includingpot experiment and a hydroponic experiment. The result showed that the selenium content in tea plant and the soil selenium content were positively correlated. Drought stress reduced the absorption rate of teaplantfrom soil. Whenthe soil moisture contentwas 90%,the root accumulated the highestselenium(0.527mg·kg-1),and showedextremely significant difference withthatplanted inthe soil moisture contentwas 50%(0.301mg·kg-1).Under different pHconditions,the leavesfrom various treatmentsaccumulate the selenium at therich-seleniumlevelwithin 72 hours, and there is no significant difference in leavesbetween various treatments. After 28 days,there is a significant differencebetween leavesfrom various treatments.The highest selenium content of leaves appeared while the pH value is 3.5, significantlyhigher thanthose inother treatments.It can be inferred thatsoil selenium content, soil moisture content and pHvalue is closely related to the selenium accumulationof teaplant.