摘要
选择典型富硒区——贵州省合肥市凤冈县西北部为研究区域,以主要农产品水稻和茶叶为研究对象,分析了不同农作物中总硒的含量,以及根际土壤中总硒和有效硒的含量,并探讨了农作物对硒的富集能力和迁移能力。结果表明:研究区表层土壤中硒含量的平均值为1.56 mg/kg,属于典型富硒土壤。同时土壤中有效态硒含量范围为0.00764~0.0308 mg/kg,只占到总硒含量的0.5%~4.45%,处于相对较低水平。研究区内,影响硒生物有效性的主要因素为土壤总硒含量和土壤pH值,土壤中总硒含量与硒的活化率呈显著负相关,相关系数r=-0.492(n=106,P<0.01),土壤pH与硒活化率呈显著正相关,相关系数r=0.413(n=106,P<0.01)。研究区农作物中,水稻各部位的富集特征为:根>籽实>茎,水稻根系富集系数均值为0.221,分别是籽粒和茎平均值的2.87、4.44倍,差异显著。茶叶的富集特征为:老叶>新叶,老叶和新叶的富硒系数范围分别在0.0184~0.1460和0.0032~0.0916之间,水稻籽实达到了富硒农产品标准(0.04~0.30 mg/kg),但绝大部分茶叶样品的硒含量都不在富硒茶的范围(0.20~4.00 mg/kg)。
To explore the impact of the crops on selenium(Se) enrichment and migration, total Se contents in the major agricultural products, i.e. rice and tea, as well as total and bioavailable Se contents in rhizosphere soils from a typical Se-rich area, northwestern Fenggang County, Zunyi City, Guizhou Province were investigated. The surface soil from the investigated area had a mean Se content of 1.56 mg/kg, which is a typical Se-rich soil. Meanwhile, the bioavailable Se content in the soil ranged from 0.007 64 to 0.030 8 mg/kg, which only accounted for 0.5% to 4.45% of the total Se content and was at a relatively low level. The major factors affecting the Se bioavailability were soil total Se content and soil pH value. Soil activation rate correlated negatively with soil total Se(r=-0.492, n=106, p0.01) but positively with soil pH(r=0.413, n=106, p0.01). The Se enrichment in different parts of rice were generally in the order of root seed stem. The enrichment coefficient of rice root averaged 0.221 which was respectively 2.87 and 4.44 times higher than those of grain and stem. The Se enrichment of tea leaves was in the order of old new leaves and the Se enrichment coefficient of old and new tea leaves ranged respectively from 0.018 4 to 0.146 0 and 0.003 2 to 0.091 6. The rice grain met the standard for Se-rich agricultural products(0.04-0.30 mg/kg), whereas the vast majority of tea samples investigated were not in the range of Se-rich tea(0.20-4.00 mg/kg).
作者
蒲帅
钱晓莉
毛旭
王琳
贺宇
仇广乐
PU Shuai;QIAO Xiaoli;MAO Xu;WANG Lin;HE Yu;QIU Guangle(College of Resources and Environmental Engineering,Guizhou University,Guiyang 550025,China;Key Laboratory of Karst Geological Resources and Environment,Ministry of Education,Guizhou University,Guiyang 550025,China;Institute of Geochemistry,Chinese Academy of Sciences,Guiyang 550081,China)
出处
《地球与环境》
CAS
CSCD
北大核心
2023年第6期612-619,共8页
Earth and Environment
基金
贵大人基合字(2019)06号。
关键词
总硒
茶叶
水稻
富集
转运
total selenium
tea leaf
rice
enrichment
migration
