期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2018
卷号：199
期号：4
页码：042048
DOI：10.1088/1755-1315/199/4/042048
语种：English
出版社：IOP Publishing
摘要：This experiment studied the effects of four different soil pH values (3.4, 4.4, 5.5, 6.6) on the growth and enzyme protection system of Sedum aizoon L. by simulating soil acidification. Results showed that: Sedum aizoon L. grew best in the control soil. With the decrease of soil pH, plant height and aboveground fresh were gradually inhibited, but mild stress (pH 5.5) could promote the growth of root length and increase the aboveground fresh, while moderate and severe stress could inhibit its increase. When the soil pH was in the range of 4.6 - 6.6, the activities of SOD,CAT, APX, GR, soluble sugar, soluble protein, proline and mad in the plant increased significantly, but the relative electrical conductivity of the root system was not significantly different from that of the control. After the soil pH was lower than 4.6, except APX activity continued to increase, SOD, CAT, GR activity and soluble sugar, soluble protein, proline content decreased significantly, and root relative conductivity and MDA content increased significantly, which indicated that severe soil acid stress would reduce root protective enzyme activity, cause osmotic adjustment imbalance, and lead to slow or even stop plant growth.
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