| Effects of improving copper\|contaminated soil with biochar and humic acid on nutrient uptake of wheat under warming conditions |
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| DOI：10.7606/j.issn.1000-7601.2024.05.19 |
| Key Words: winter wheat nighttime warming soil copper pollution biochar humic acid |
| Author Name | Affiliation | | YUN Wangshu | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | LIU Dehong | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | KOU Taiji | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | LAI Lukuan | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China | | XIA Dongfang | College of Agriculture, Henan University of Science and Technology, Luoyang, Henan 471023, China |
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| Abstract: |
| To evaluate the effects of biochar and humic acid on copper (Cu) contaminated soil under climate warming conditions, a two\|factor pot experiment was conducted in Luoyang City, Henan Province, in 2020. The experiment included treatments with biochar (CCu), a low amount of humic acid (F1Cu), and a high amount of humic acid (F2Cu) in Cu\|contaminated soil. A passive night\|warming system was used in the field, with winter wheat as the study material. The dry matter accumulation and distribution, nitrogen (N), phosphorus (P) and copper (Cu) uptake, utilization, transport and migration of wheat at maturity stage were studied. The results showed that the passive warming system in the field increased the temperature of wheat by an average of 0.56℃ during the whole growth period and achieved a good warming effect. Copper pollution inhibited wheat growth, significantly reducing the biomass of all plant parts by 22.3% to 76.0%. Nighttime warming (HT) increased the biomass of winter wheat (22.3%~27.83%), alleviating the inhibitory effect of Cu pollution on wheat growth to a certain extent. HT reduced the variation range of N and P contents of wheat plants among tissues in Cu contaminated soil but had no significant effect on the average content. In CK treatment, HT significantly increased the transport of Cu from underground to aboveground by 229.62%, and significantly increased the accumulation of N and P in wheat plants (11.1%~45.5%). The application of humic acid and biochar reduced the inhibitory effect of Cu pollution on wheat growth, and the expression of F2Cu>F1Cu>CCu in total biomass was reduced. The application of humic acid (F1Cu, F2Cu) increased the accumulation of N and P in wheat. Compared with the Cu treatment, the N accumulation of wheat plants was significantly increased by 22.2%~100%. The addition of amendments was beneficial to the migration of Cu from stem to panicle (9.6%~79.8%), and CCu treatment promoted its transport more significantly. In conclusion, the application of humic acid and biochar can mitigate the harmful effects of copper pollution on wheat growth to varying degrees and enhance wheat’s ability to resist Cu stress. However, the effectiveness of these treatments in improving Cu\|contaminated soil may vary under future climatic conditions. |
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