摘要
采用电感耦合等离子体质谱法,测定了8个代表性茶园土壤和对应茶树各器官硒含量,同时测定茶汤中硒含量和溶出率,分析硒在茶园土壤-茶树-茶汤中迁移转化规律,并探讨土壤理化性质对其的影响。结果表明,8个样点茶园土壤全硒均值为1.53 mg·kg^-1,均超过富硒土壤标准(0.40 mg·kg^-1),茶园土壤有效硒含量均值0.32 mg·kg^-1,硒的活化率均值20.23%。不同样点的茶树各器官硒含量和富集系数差异较大,茶树各器官硒含量表现为侧根>主根>主茎≈侧茎≈老叶>新叶,总体表现出从根部—茎—叶片自下而上依次递减规律;各样点茶树器官硒富集系数多数小于1,富集能力相对较弱,茶树侧根的硒富集系数均显著高于其它器官(P<0.05);茶树各器官硒转移系数大多小于1,硒元素大部分被根系所固定,转运到新叶的硒含量较少。茶汤中硒含量为0.83~1.20μg·L^-1(均值为0.95μg·L^-1),茶叶硒溶出率为20.01%~48.79%(均值为31.21%)。茶树新叶和老叶硒富集系数与土壤有效硒和硒活化率之间相关性均未达到显著性水平,而茶树侧根硒富集系数与土壤有效硒和硒活化率之间呈显著正相关;土壤pH与茶树侧茎、主茎、主根和侧根硒富集系数之间呈显著或极显著正相关,与茶树新叶和老叶硒转移系数之间呈显著负相关;土壤全磷和速效磷之间与茶树主茎硒富集系数之间呈显著负相关,与茶树新叶硒转移系数呈显著正相关。
The selenium(Se)contents of an extensive collection of soil and plant samples from 8 tea plantations in central Fujian as well as the brewed teas were determined using the inductively coupled plasma mass spectrometry.The translocation and transformation of the metal ion from plantation soil to tea leaf to brewed tea were analyzed.The average contents of total and available Se in soil were 1.53 and 0.32 mg·kg^-1,respectively.The total Se in all soil samples exceeded the thresholds of high-Se soil of 0.40mg/kg.The amount and enrichment coefficient of Se in parts of a plant varied significantly.The Se concentrations in the plant parts decreased in the order of:lateral roots>tap roots>main stem≈stem side≈old leaves>young leaves.The maximum Se-enrichment coefficients in all plant parts were less than 1,indicating an overall relatively low Se accumulation of the plant.Among the different parts,roots had a coefficient significantly higher than other organs(P<0.05).The Se-transfer coefficients between plant parts were all below 1,suggesting that most of the Se absorbed by a tea plant remained in the roots and stems.The brewed teas contained 0.83μg·L^-1 to 1.20μg·L^-1,averaging 0.95μg·L^-1,of Se,and between 20.01%and 48.79%,averaging 31.21%,of the Se in the leaves leached into the tea.The Se-enrichment coefficients of the lateral roots,but not the leaves,of a tea plant significantly correlated with the available Se and available rate of Se in the soil.The soil pH significantly or extremely significantly correlated with the Se-enrichment coefficients of the side stems,main stems,lateral and tap roots,and significantly inversely correlated with the Se-transfer coefficients of the old and young leaves of a plant.The total and available phosphorus in soil significantly inversely correlated with the Se-transfer coefficient of the main stems but significantly correlated with the Se-transfer coefficient of the young leaves on a plant.
作者
陈玉真
单睿阳
王峰
陈常颂
尤志明
马丽婷
臧春荣
余文权
CHEN Yu-zhen;SHAN Rui-yang;WANG Feng;CHEN Chang-song;YOU Zhi-ming;MA Li-ting;ZANG Chun-rong;YU Wen-quan(Tea Research Institute,Fujian Academy of Agricultural Sciences,Fuzhou,Fujian 350013,China;Fujian Academy of Agricultural Sciences,Fuzhou,Fujian 350002,China;Ningde vocational and technical college,Fu’an,Fujian 355000,China)
出处
《茶叶学报》
2019年第3期106-113,共8页
Acta Tea Sinica
基金
国家重点研发计划(2016YFD0200903)
福建省自然科学基金(2016J01120)
福建省农业科学院科技创新团队(STIT2017-1-3,STIT2017-3-8)
福建省科技计划项目星火项目(2015S0043)
关键词
硒
茶园土壤
茶树
富集系数
转移系数
selenium
tea plantation soil
tea plants
enrichment coefficient
transfer coefficient
