锌胁迫对重金属富集植物黑麦草养分吸收和锌积累的影响

采用土培根袋试验研究了锌胁迫对重金属富积累植物黑麦草4个品种生长，N、P、K养分及Zn吸收积累的影响。结果表明，Zn在一定范围内（0～520mg／kg）促进了黑麦草生长，RTI（根系耐性指数）≥1.0（0～520mg／kg Zn^2＋）。在Zn^2＋≤260mg／kg（根系）或Zn^2＋≤520mg／kg（地上部）时，黑麦草吸收N、P、K并未受到抑制。植株地上部和根系最大N、P、K含量大多出现在生物量最大或次高的260，520mg／kg Zn^2＋处理中。黑麦草植株Zn含量随Zn胁迫的增加而增加，以泰德植株Zn含量和对Zn的转运率最高（其植株Zn地上部最大含量为583.9mg／kg DW，加Zn处理的S／R〉1）。

Effects of Zn Stress on Nutrient Uptake and Zn Accumulation in Four Varieties of Ryegrass

In this paper, we explored the influence of Zn stress on plant growth, nutrient content and Zn accumulation in four varieties of ryegrass (Loliurn perenne L.) by pot experiment (root bag method). The results showed that Zn (at Zn concentrations of 0~520 mg/kg in soil) stimulated the plant growth of ryegrass, RTI (root tolerance index) was more than 1.0 (0~520 mg/kg Zn~(2 ) in soil). Zn stress (260 mg/kg or 520 mg/kg Zn~(2 ) in soil) did not inhibited N, P and K absorption by plant of ryegrass. The maximum or high Zn contents in shoots and roots were found at Zn treatments of 260 mg/kg or 520 mg/kg in soil, in which the maximium or high biomass were recorded. Zn contents in plant were increased with increasing Zn concentrations in soil. Zn contents and transport rates of Taide were higher than the other varieties of ryegrass (S/R>1). The maximums of Zn contents in shoots of Taide were found by 583.9 mg/kg DW (at Zn concentrations of 1 040 mg/kg in soil).