土壤和茶树对稀土元素的富集作用

The accumulation of rare earth elements in soil and teatree

稀土元素广泛应用于作物增产，但它对生态环境的影响却不甚了解，春茶萌芽时使用稀释３００倍的稀土微肥南大２９９８茶素喷施叶面，分别于３、６、９、１２个月时测定土壤和茶树中稀土元素的含量变化和累积情况。结果指出：施用稀土后短时间内，土壤和茶树中稀土元素的含量均比未施用稀土时有不同程度的增加，经过较长时间后，上层土壤中的稀土元素向下层土壤迁移，并在下层土壤中富集；而茶树的根、茎中稀土含量均表现为下降，叶中的含量呈不同变化趋势，即铈组稀土含量上升３．７４ｍｇ／ｋｇ，钇组稀土含量下降０．９１ｍｇ／ｋｇ，表明茶叶对铈组稀土有较强的富集作用。

he accumulation of rare earth elements (REEs) in soil and teatree was investigated by spraying REEs fertilizer on teatree. The results revealed that contents of REEs in soil and teatree increased in a short period of time of spraying. After a longer period of time of spraying, REEs in soil of upper layer were transported to and accumulated in soil of lower layer;contents of REEs in root and stalk of teatree decreased;REEs in leaf changed differently with REEs of Ce-family inereased and that of Y-family decreased. This showed that leaf of teatree had an obvious accumulation on REEs of Ce-family.