干旱与盐胁迫下不同栽培基质碧玉兰POD活性的变化

选取树皮、泥炭、水苔、陶粒4种材料，净化处理后按8种不同配比分别对碧玉兰进行干旱胁迫和盐胁迫处理。结果表明，干旱胁迫和盐胁迫对碧玉兰体内过氧化物酶（POD）活性的影响存在差异。碧玉兰POD活性在干旱胁迫后35d保持比较平稳的上升趋势，42d时出现大幅度上升；盐胁迫后呈先上升后下降的趋势。干旱胁迫下，3／4树皮＋1／4泥炭所栽培碧玉兰POD活性上升较为稳定；盐胁迫下，1／2树皮＋1／4泥炭＋1／4陶粒所栽培碧玉兰POD活性变化相对其他栽培基质更缓和。

POD activity change in Cymbidium lowianum grown by different substrates under drought and salt stresses

The author selected four materials including bark, peat, sphagnum moss and porcelain granule, and made them purified. Then the author made Cymbidium lowianum on the drought stress and salt stress test by assigning these four materials to eight formu- lations. The results showed that there were differences in the influence on the peroxidase （POD） activity of C. knv/anum brought by these two stresses. On one hand, after taken the drought stress, this POD activity remained in relatively stable rise when in 35 days but rose greatly when in 42 days, while it firstly rose and then fell after taken the salt stress. On the other hand, under the drought stress, the POD activity of C. lowianum grown by three-quarter bark and one-quarter peat rose relatively stably, while under the salt stress the POD activity of C. lowianum grown by one half bark, one-quarter peat and one-quarter porcelain granule took milder change compared with other formulations.