Wei Wei, Li Ping, Lang Man
Jiangsu Key Laboratory of Agriculture Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
School of Applied Meteorology, Nanjing University of Information Science & Technology, Nanjing 210044, China.
Huan Jing Ke Xue. 2021 Sep 8;42(9):4462-4470. doi: 10.13227/j.hjkx.202101263.
A rice pot experiment was conducted to study the effects of four soil conditioners, namely polyacrylic acid (PAA), polyacrylamide (PAM), polyvinyl alcohol (PVA), and humic acid (HA), on rice growth and heavy metal uptake from paddy soil contaminated with copper and cadmium. The results showed that the height and straw weight of rice in the conditioned soil treatments increased by 7.34%-22.0% and 10.0%-32.2%, respectively, compared to the control treatment. The increased height and straw weight was generally proportional to the amount of soil conditioners used in each treatment. Application of 0.4% soil conditioners led to a slight reduction in rice yield, with the grain weight decreasing by 6.70%-32.6% relative to the control treatment. Soil conditioners had no effect on soil pH, but significantly reduced the concentration of soil available Cu (5.38%-39.7%) and Cd (6.98%-59.6%). Similarly, concentrations of Cu in rice root, straw, and grain were decreased by 0.88%-27.2%, 8.50%-45.2%, and 3.41%-31.2%, respectively, while concentrations of Cd were decreased by 5.93%-20.5%, 10.0%-51.4%, and 3.12%-50.7%, respectively. The largest and smallest decreases occurred in the PAA and PVA treatments, respectively. Application of PAA, PAM, and HA significantly decreased the translocation factor of Cu from root to straw by 11.2%-27.1%, whereas the translocation factor of Cu from straw to grain increased by 17.9%-33.6%, respectively, compared with the control treatment. Application of PAA, PAM, and HA significantly decreased the translocation factor of Cd from root to straw by 15.2%-38.5%, compared with the control treatment, but with the exception of HA, had no effect on Cd translocation from straw to grain. In general, the application of soil conditioners promoted rice growth, inhibited the uptake of Cu and Cd by rice, and had a certain remediation effect on heavy metal contaminated soil.
进行了一项水稻盆栽试验，以研究四种土壤改良剂，即聚丙烯酸（PAA）、聚丙烯酰胺（PAM）、聚乙烯醇（PVA）和腐殖酸（HA），对受铜和镉污染的稻田土壤中水稻生长及重金属吸收的影响。结果表明，与对照处理相比，经土壤改良剂处理的土壤中水稻的株高和秸秆重量分别增加了7.34% - 22.0%和10.0% - 32.2%。株高和秸秆重量的增加通常与各处理中土壤改良剂的用量成正比。施用0.4%的土壤改良剂导致水稻产量略有下降，相对于对照处理，粒重下降了6.70% - 32.6%。土壤改良剂对土壤pH值没有影响，但显著降低了土壤有效铜（5.38% - 39.7%）和镉（6.98% - 59.6%）的浓度。同样，水稻根、秸秆和籽粒中铜的浓度分别降低了0.88% - 27.2%、8.50% - 45.2%和3.41% - 31.2%，而镉的浓度分别降低了5.93% - 20.5%、10.0% - 51.4%和3.12% - 50.7%。最大降幅和最小降幅分别出现在PAA处理和PVA处理中。与对照处理相比，施用PAA、PAM和HA显著降低了铜从根到秸秆的转运系数11.2% - 27.1%，而铜从秸秆到籽粒的转运系数分别增加了17.9% - 33.6%。与对照处理相比，施用PAA、PAM和HA显著降低了镉从根到秸秆的转运系数15.2% - 38.5%，但除HA外，对镉从秸秆到籽粒的转运没有影响。总体而言，土壤改良剂的施用促进了水稻生长，抑制了水稻对铜和镉的吸收，并对重金属污染土壤有一定的修复作用。
