Pb胁迫下栀子幼苗生长生理的动态观察及生长模型

o investigate the effects of different Pb concentrations in soil on the growth of Gardenia jasminoides seedlings and their growth models, as well as the ability of Gardenia jasminoides to improve soil by absorbing and transferring Pb. Potted gardenia seedlings were selected as the research object, and soil Pb concentrations were set up in five treatment groups: 0mg/kg (control group DZ), 500mg/kg (SY1), 1000mg/kg (SY2), 1500mg/kg (SY3), and 2000mg/kg (SY4). Five indicators including plant height, net photosynthetic rate, SOD, POD, CAT were measured. Statistical analysis shows that: (1) The height, net photosynthetic rate, SOD, POD, and CAT indicators of Gardenia jasminoides exhibit highly significant (P<0.01) logistic growth curves with growth time. (2) Paired t-test showed that there were significant differences (P<0.01) between the normal group and each experimental group in terms of various indicators, and there were also significant differences (P<0.01) between other experimental groups. (3) With the increase of soil Pb content, the absorption of Pb by the aboveground and underground parts of Gardenia jasminoides seedlings, as well as the whole plant, also increases. Among them, the absorption of Pb by roots is 2-3 times that of stems and leaves. From the perspective of the entire plant, the transfer coefficients of SY3 and SY4 groups are the highest, at 0.731 and 0.734, respectively. Basic conclusion: When the soil Pb content reaches 2000 mg/kg, it will significantly affect the normal physiological growth changes of gardenia seedlings; When the increase in soil Pb content reached 500mg/kg, it significantly affected the normal physiological growth changes of gardenia seedlings; When the soil Pb content is not higher than 1500 mg/kg, the physiological growth changes of Gardenia jasminoides seedlings are significantly lower than those of 2000 mg/kg, while also having a high transfer coefficient, which can effectively improve the soil.