高锌土壤上春小麦对~(65)Zn的吸收分布及其根际效应

利用６５ Ｚｎ 示踪法研究了高锌土壤春小麦对外源６５Ｚｎ 的吸收和６５ Ｚｎ 在小麦各器官中的累积分布。结果表明：外源６５ Ｚｎ 在小麦各器官的分配顺序为：茎叶＞ 籽粒＞根＞ 颖壳；６５Ｚｎ 在小麦各器官的比活度顺序为根＞ 籽粒＞ 颖壳≥茎叶；６５Ｚｎ 从土壤向小麦各器官的转移系数为：根＞ 籽粒＞ 颖壳≥茎叶。随着外源６５ Ｚｎ 浓度增加，小麦植株吸６５Ｚｎ 量及小麦籽粒中６５ Ｚｎ 量增加，６５ Ｚｎ 在小麦根部的分配比例也随之增加。小麦根际土对６５Ｚｎ 有富集作用。

ABSORPTION AND DISTRIBUTION OF Zn BY SPRING WHEAT IN HIGH ZINC SOIL AND EFFECT OF RHIZOSPHERE SOIL

The isotope tracer technique was used to study the absorption and distribution of 65 Zn by spring wheat in high zinc soil.The results showed that the distribution of 65 Zn in the organs of spring wheat was in the order as stem leaf>grain>root>wheat husk;the specific activity of 65 Zn and the transfer factor of 65 Zn in the organs of spring wheat were in the order as root>grain>wheat husk>stem leaf.With added 65 Zn increased,the absorption amount of 65 Zn by spring wheat and the distribution of 65 Zn in root increased.The 65 Zn applied was enriched by rhizosphere soil of spring wheat.